mirror of
https://github.com/lua/lua
synced 2024-11-22 04:41:23 +03:00
First version of GC counting objects for control
Still needs to review generational mode.
This commit is contained in:
Roberto Ierusalimschy
parent
76953316d1
commit
f356d5acdd
9
lapi.c
9
lapi.c
@ -1154,11 +1154,11 @@ LUA_API int lua_gc (lua_State *L, int what, ...) {
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}
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case LUA_GCCOUNT: {
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/* GC values are expressed in Kbytes: #bytes/2^10 */
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res = cast_int(gettotalbytes(g) >> 10);
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res = cast_int(g->totalbytes >> 10);
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break;
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}
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case LUA_GCCOUNTB: {
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res = cast_int(gettotalbytes(g) & 0x3ff);
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res = cast_int(g->totalbytes & 0x3ff);
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break;
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}
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case LUA_GCSTEP: {
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@ -1171,7 +1171,7 @@ LUA_API int lua_gc (lua_State *L, int what, ...) {
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luaC_step(L);
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}
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else { /* add 'data' to total debt */
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debt = cast(l_mem, data) * 1024 + g->GCdebt;
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debt = data + g->GCdebt;
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luaE_setdebt(g, debt);
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luaC_checkGC(L);
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}
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@ -1217,7 +1217,8 @@ LUA_API int lua_gc (lua_State *L, int what, ...) {
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if (stepmul != 0)
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setgcparam(g->gcstepmul, stepmul);
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if (stepsize != 0)
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g->gcstepsize = stepsize;
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g->gcstepsize = (stepsize <= log2maxs(l_mem)) ? stepsize
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: log2maxs(l_mem);
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luaC_changemode(L, KGC_INC);
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break;
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}
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253
lgc.c
253
lgc.c
@ -19,6 +19,7 @@
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#include "ldo.h"
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#include "lfunc.h"
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#include "lgc.h"
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#include "llex.h"
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#include "lmem.h"
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#include "lobject.h"
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#include "lstate.h"
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@ -32,7 +33,7 @@
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** (Large enough to dissipate fixed overheads but small enough
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** to allow small steps for the collector.)
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*/
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#define GCSWEEPMAX 100
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#define GCSWEEPMAX 20
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/*
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** Maximum number of finalizers to call in each single step.
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@ -46,19 +47,6 @@
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#define GCFINALIZECOST 50
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/*
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** The equivalent, in bytes, of one unit of "work" (visiting a slot,
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** sweeping an object, etc.)
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*/
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#define WORK2MEM sizeof(TValue)
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/*
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** macro to adjust 'pause': 'pause' is actually used like
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** 'pause / PAUSEADJ' (value chosen by tests)
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*/
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#define PAUSEADJ 100
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/* mask with all color bits */
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#define maskcolors (bitmask(BLACKBIT) | WHITEBITS)
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@ -105,7 +93,7 @@
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#define markobjectN(g,t) { if (t) markobject(g,t); }
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static void reallymarkobject (global_State *g, GCObject *o);
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static lu_mem atomic (lua_State *L);
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static l_mem atomic (lua_State *L);
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static void entersweep (lua_State *L);
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@ -259,7 +247,7 @@ GCObject *luaC_newobjdt (lua_State *L, int tt, size_t sz, size_t offset) {
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global_State *g = G(L);
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char *p = cast_charp(luaM_newobject(L, novariant(tt), sz));
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GCObject *o = cast(GCObject *, p + offset);
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g->totalobjs++;
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g->GCdebt++;
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o->marked = luaC_white(g);
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o->tt = tt;
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o->next = g->allgc;
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@ -268,6 +256,9 @@ GCObject *luaC_newobjdt (lua_State *L, int tt, size_t sz, size_t offset) {
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}
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/*
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** create a new collectable object with no offset.
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*/
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GCObject *luaC_newobj (lua_State *L, int tt, size_t sz) {
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return luaC_newobjdt(L, tt, sz, 0);
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}
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@ -296,6 +287,7 @@ GCObject *luaC_newobj (lua_State *L, int tt, size_t sz) {
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** (only closures can), and a userdata's metatable must be a table.
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*/
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static void reallymarkobject (global_State *g, GCObject *o) {
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g->marked++;
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switch (o->tt) {
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case LUA_VSHRSTR:
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case LUA_VLNGSTR: {
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@ -343,9 +335,9 @@ static void markmt (global_State *g) {
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/*
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** mark all objects in list of being-finalized
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*/
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static lu_mem markbeingfnz (global_State *g) {
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static l_mem markbeingfnz (global_State *g) {
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GCObject *o;
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lu_mem count = 0;
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l_mem count = 0;
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for (o = g->tobefnz; o != NULL; o = o->next) {
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count++;
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markobject(g, o);
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@ -365,12 +357,11 @@ static lu_mem markbeingfnz (global_State *g) {
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** upvalues, as they have nothing to be checked. (If the thread gets an
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** upvalue later, it will be linked in the list again.)
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*/
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static int remarkupvals (global_State *g) {
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static l_mem remarkupvals (global_State *g) {
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l_mem work = 0;
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lua_State *thread;
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lua_State **p = &g->twups;
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int work = 0; /* estimate of how much work was done here */
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while ((thread = *p) != NULL) {
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work++;
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if (!iswhite(thread) && thread->openupval != NULL)
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p = &thread->twups; /* keep marked thread with upvalues in the list */
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else { /* thread is not marked or without upvalues */
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@ -380,13 +371,13 @@ static int remarkupvals (global_State *g) {
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thread->twups = thread; /* mark that it is out of list */
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for (uv = thread->openupval; uv != NULL; uv = uv->u.open.next) {
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lua_assert(getage(uv) <= getage(thread));
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work++;
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if (!iswhite(uv)) { /* upvalue already visited? */
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lua_assert(upisopen(uv) && isgray(uv));
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markvalue(g, uv->v.p); /* mark its value */
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}
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}
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}
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work++;
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}
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return work;
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}
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@ -399,10 +390,15 @@ static void cleargraylists (global_State *g) {
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/*
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** mark root set and reset all gray lists, to start a new collection
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** mark root set and reset all gray lists, to start a new collection.
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** 'marked' is initialized with the number of fixed objects in the state,
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** to count the total number of live objects during a cycle. (That is
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** the metafield names, plus the reserved words, plus "_ENV" plus the
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** memory-error message.)
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*/
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static void restartcollection (global_State *g) {
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cleargraylists(g);
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g->marked = TM_N + NUM_RESERVED + 2;
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markobject(g, g->mainthread);
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markvalue(g, &g->l_registry);
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markmt(g);
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@ -540,7 +536,7 @@ static void traversestrongtable (global_State *g, Table *h) {
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}
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static lu_mem traversetable (global_State *g, Table *h) {
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static void traversetable (global_State *g, Table *h) {
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const char *weakkey, *weakvalue;
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const TValue *mode = gfasttm(g, h->metatable, TM_MODE);
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markobjectN(g, h->metatable);
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@ -557,17 +553,15 @@ static lu_mem traversetable (global_State *g, Table *h) {
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}
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else /* not weak */
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traversestrongtable(g, h);
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return 1 + h->alimit + 2 * allocsizenode(h);
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}
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static int traverseudata (global_State *g, Udata *u) {
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static void traverseudata (global_State *g, Udata *u) {
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int i;
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markobjectN(g, u->metatable); /* mark its metatable */
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for (i = 0; i < u->nuvalue; i++)
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markvalue(g, &u->uv[i].uv);
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genlink(g, obj2gco(u));
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return 1 + u->nuvalue;
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}
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@ -576,7 +570,7 @@ static int traverseudata (global_State *g, Udata *u) {
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** arrays can be larger than needed; the extra slots are filled with
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** NULL, so the use of 'markobjectN')
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*/
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static int traverseproto (global_State *g, Proto *f) {
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static void traverseproto (global_State *g, Proto *f) {
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int i;
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markobjectN(g, f->source);
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for (i = 0; i < f->sizek; i++) /* mark literals */
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@ -587,29 +581,26 @@ static int traverseproto (global_State *g, Proto *f) {
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markobjectN(g, f->p[i]);
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for (i = 0; i < f->sizelocvars; i++) /* mark local-variable names */
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markobjectN(g, f->locvars[i].varname);
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return 1 + f->sizek + f->sizeupvalues + f->sizep + f->sizelocvars;
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}
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static int traverseCclosure (global_State *g, CClosure *cl) {
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static void traverseCclosure (global_State *g, CClosure *cl) {
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int i;
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for (i = 0; i < cl->nupvalues; i++) /* mark its upvalues */
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markvalue(g, &cl->upvalue[i]);
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return 1 + cl->nupvalues;
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}
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/*
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** Traverse a Lua closure, marking its prototype and its upvalues.
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** (Both can be NULL while closure is being created.)
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*/
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static int traverseLclosure (global_State *g, LClosure *cl) {
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static void traverseLclosure (global_State *g, LClosure *cl) {
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int i;
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markobjectN(g, cl->p); /* mark its prototype */
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for (i = 0; i < cl->nupvalues; i++) { /* visit its upvalues */
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UpVal *uv = cl->upvals[i];
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markobjectN(g, uv); /* mark upvalue */
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}
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return 1 + cl->nupvalues;
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}
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@ -625,13 +616,13 @@ static int traverseLclosure (global_State *g, LClosure *cl) {
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** (which can only happen in generational mode) or if the traverse is in
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** the propagate phase (which can only happen in incremental mode).
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*/
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static int traversethread (global_State *g, lua_State *th) {
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static void traversethread (global_State *g, lua_State *th) {
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UpVal *uv;
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StkId o = th->stack.p;
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if (isold(th) || g->gcstate == GCSpropagate)
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linkgclist(th, g->grayagain); /* insert into 'grayagain' list */
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if (o == NULL)
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return 1; /* stack not completely built yet */
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return; /* stack not completely built yet */
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lua_assert(g->gcstate == GCSatomic ||
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th->openupval == NULL || isintwups(th));
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for (; o < th->top.p; o++) /* mark live elements in the stack */
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@ -649,34 +640,35 @@ static int traversethread (global_State *g, lua_State *th) {
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}
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else if (!g->gcemergency)
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luaD_shrinkstack(th); /* do not change stack in emergency cycle */
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return 1 + stacksize(th);
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}
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/*
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** traverse one gray object, turning it to black.
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*/
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static lu_mem propagatemark (global_State *g) {
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static void propagatemark (global_State *g) {
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GCObject *o = g->gray;
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nw2black(o);
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g->gray = *getgclist(o); /* remove from 'gray' list */
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switch (o->tt) {
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case LUA_VTABLE: return traversetable(g, gco2t(o));
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case LUA_VUSERDATA: return traverseudata(g, gco2u(o));
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case LUA_VLCL: return traverseLclosure(g, gco2lcl(o));
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case LUA_VCCL: return traverseCclosure(g, gco2ccl(o));
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case LUA_VPROTO: return traverseproto(g, gco2p(o));
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case LUA_VTHREAD: return traversethread(g, gco2th(o));
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default: lua_assert(0); return 0;
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case LUA_VTABLE: traversetable(g, gco2t(o)); break;
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case LUA_VUSERDATA: traverseudata(g, gco2u(o)); break;
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case LUA_VLCL: traverseLclosure(g, gco2lcl(o)); break;
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case LUA_VCCL: traverseCclosure(g, gco2ccl(o)); break;
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case LUA_VPROTO: traverseproto(g, gco2p(o)); break;
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case LUA_VTHREAD: traversethread(g, gco2th(o)); break;
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default: lua_assert(0);
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}
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}
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static lu_mem propagateall (global_State *g) {
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lu_mem tot = 0;
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while (g->gray)
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tot += propagatemark(g);
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return tot;
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static l_mem propagateall (global_State *g) {
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l_mem work = 0;
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while (g->gray) {
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propagatemark(g);
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work++;
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}
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return work;
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}
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@ -685,10 +677,10 @@ static lu_mem propagateall (global_State *g) {
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** Repeat until it converges, that is, nothing new is marked. 'dir'
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** inverts the direction of the traversals, trying to speed up
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** convergence on chains in the same table.
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**
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*/
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static void convergeephemerons (global_State *g) {
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static l_mem convergeephemerons (global_State *g) {
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int changed;
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l_mem work = 0;
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int dir = 0;
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do {
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GCObject *w;
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@ -703,9 +695,11 @@ static void convergeephemerons (global_State *g) {
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propagateall(g); /* propagate changes */
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changed = 1; /* will have to revisit all ephemeron tables */
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}
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work++;
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}
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dir = !dir; /* invert direction next time */
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} while (changed); /* repeat until no more changes */
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return work;
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}
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/* }====================================================== */
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@ -721,7 +715,8 @@ static void convergeephemerons (global_State *g) {
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/*
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** clear entries with unmarked keys from all weaktables in list 'l'
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*/
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static void clearbykeys (global_State *g, GCObject *l) {
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static l_mem clearbykeys (global_State *g, GCObject *l) {
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l_mem work = 0;
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for (; l; l = gco2t(l)->gclist) {
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Table *h = gco2t(l);
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Node *limit = gnodelast(h);
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@ -732,7 +727,9 @@ static void clearbykeys (global_State *g, GCObject *l) {
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if (isempty(gval(n))) /* is entry empty? */
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clearkey(n); /* clear its key */
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}
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work++;
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}
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return work;
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}
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@ -740,7 +737,8 @@ static void clearbykeys (global_State *g, GCObject *l) {
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** clear entries with unmarked values from all weaktables in list 'l' up
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** to element 'f'
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*/
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static void clearbyvalues (global_State *g, GCObject *l, GCObject *f) {
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static l_mem clearbyvalues (global_State *g, GCObject *l, GCObject *f) {
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l_mem work = 0;
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for (; l != f; l = gco2t(l)->gclist) {
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Table *h = gco2t(l);
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Node *n, *limit = gnodelast(h);
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@ -757,7 +755,9 @@ static void clearbyvalues (global_State *g, GCObject *l, GCObject *f) {
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if (isempty(gval(n))) /* is entry empty? */
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clearkey(n); /* clear its key */
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}
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work++;
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}
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return work;
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}
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@ -819,10 +819,9 @@ static void freeobj (lua_State *L, GCObject *o) {
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** objects, where a dead object is one marked with the old (non current)
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** white; change all non-dead objects back to white, preparing for next
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** collection cycle. Return where to continue the traversal or NULL if
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** list is finished. ('*countout' gets the number of elements traversed.)
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** list is finished.
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*/
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static GCObject **sweeplist (lua_State *L, GCObject **p, int countin,
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int *countout) {
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static GCObject **sweeplist (lua_State *L, GCObject **p, int countin) {
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global_State *g = G(L);
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int ow = otherwhite(g);
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int i;
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@ -839,8 +838,6 @@ static GCObject **sweeplist (lua_State *L, GCObject **p, int countin,
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p = &curr->next; /* go to next element */
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}
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}
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if (countout)
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*countout = i; /* number of elements traversed */
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return (*p == NULL) ? NULL : p;
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}
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@ -851,7 +848,7 @@ static GCObject **sweeplist (lua_State *L, GCObject **p, int countin,
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static GCObject **sweeptolive (lua_State *L, GCObject **p) {
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GCObject **old = p;
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do {
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p = sweeplist(L, p, 1, NULL);
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p = sweeplist(L, p, 1);
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} while (p == old);
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return p;
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}
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@ -870,11 +867,8 @@ static GCObject **sweeptolive (lua_State *L, GCObject **p) {
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*/
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static void checkSizes (lua_State *L, global_State *g) {
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if (!g->gcemergency) {
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if (g->strt.nuse < g->strt.size / 4) { /* string table too big? */
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l_mem olddebt = g->GCdebt;
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if (g->strt.nuse < g->strt.size / 4) /* string table too big? */
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luaS_resize(L, g->strt.size / 2);
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g->GCestimate += g->GCdebt - olddebt; /* correct estimate */
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}
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}
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}
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@ -935,12 +929,11 @@ static void GCTM (lua_State *L) {
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/*
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** Call a few finalizers
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*/
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static int runafewfinalizers (lua_State *L, int n) {
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static void runafewfinalizers (lua_State *L, int n) {
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global_State *g = G(L);
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int i;
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for (i = 0; i < n && g->tobefnz; i++)
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GCTM(L); /* call one finalizer */
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return i;
|
||||
}
|
||||
|
||||
|
||||
@ -1052,19 +1045,16 @@ void luaC_checkfinalizer (lua_State *L, GCObject *o, Table *mt) {
|
||||
|
||||
/*
|
||||
** Set the "time" to wait before starting a new GC cycle; cycle will
|
||||
** start when memory use hits the threshold of ('estimate' * pause /
|
||||
** PAUSEADJ). (Division by 'estimate' should be OK: it cannot be zero,
|
||||
** because Lua cannot even start with less than PAUSEADJ bytes).
|
||||
** start when number of objects in use hits the threshold of
|
||||
** approximately ('marked' * pause / 100). (A direct multiplication
|
||||
** by 'pause' may overflow, and a direct division by 100 may undeflow
|
||||
** to zero. So, the division is done in two steps. 8 * 12 is near 100
|
||||
** and the division by 8 is cheap.)
|
||||
*/
|
||||
static void setpause (global_State *g) {
|
||||
l_mem threshold, debt;
|
||||
int pause = getgcparam(g->gcpause);
|
||||
l_mem estimate = g->GCestimate / PAUSEADJ; /* adjust 'estimate' */
|
||||
lua_assert(estimate > 0);
|
||||
threshold = (pause < MAX_LMEM / estimate) /* overflow? */
|
||||
? estimate * pause /* no overflow */
|
||||
: MAX_LMEM; /* overflow; truncate to maximum */
|
||||
debt = gettotalbytes(g) - threshold;
|
||||
unsigned int pause = getgcparam(g->gcpause);
|
||||
lu_mem threshold = g->marked / 8 * pause / 12;
|
||||
l_mem debt = gettotalobjs(g) - threshold;
|
||||
if (debt > 0) debt = 0;
|
||||
luaE_setdebt(g, debt);
|
||||
}
|
||||
@ -1306,17 +1296,17 @@ static void atomic2gen (lua_State *L, global_State *g) {
|
||||
|
||||
g->gckind = KGC_GEN;
|
||||
g->lastatomic = 0;
|
||||
g->GCestimate = gettotalbytes(g); /* base for memory control */
|
||||
g->GCestimate = gettotalobjs(g); /* base for memory control */
|
||||
finishgencycle(L, g);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
** Set debt for the next minor collection, which will happen when
|
||||
** memory grows 'genminormul'%.
|
||||
** total number of objects grows 'genminormul'%.
|
||||
*/
|
||||
static void setminordebt (global_State *g) {
|
||||
luaE_setdebt(g, -(cast(l_mem, (gettotalbytes(g) / 100)) * g->genminormul));
|
||||
luaE_setdebt(g, -(cast(l_mem, (gettotalobjs(g) / 100)) * g->genminormul));
|
||||
}
|
||||
|
||||
|
||||
@ -1326,14 +1316,12 @@ static void setminordebt (global_State *g) {
|
||||
** are cleared. Then, turn all objects into old and finishes the
|
||||
** collection.
|
||||
*/
|
||||
static lu_mem entergen (lua_State *L, global_State *g) {
|
||||
lu_mem numobjs;
|
||||
static void entergen (lua_State *L, global_State *g) {
|
||||
luaC_runtilstate(L, bitmask(GCSpause)); /* prepare to start a new cycle */
|
||||
luaC_runtilstate(L, bitmask(GCSpropagate)); /* start new cycle */
|
||||
numobjs = atomic(L); /* propagates all and then do the atomic stuff */
|
||||
atomic(L); /* propagates all and then do the atomic stuff */
|
||||
atomic2gen(L, g);
|
||||
setminordebt(g); /* set debt assuming next cycle will be minor */
|
||||
return numobjs;
|
||||
}
|
||||
|
||||
|
||||
@ -1372,9 +1360,9 @@ void luaC_changemode (lua_State *L, int newmode) {
|
||||
/*
|
||||
** Does a full collection in generational mode.
|
||||
*/
|
||||
static lu_mem fullgen (lua_State *L, global_State *g) {
|
||||
static void fullgen (lua_State *L, global_State *g) {
|
||||
enterinc(g);
|
||||
return entergen(L, g);
|
||||
entergen(L, g);
|
||||
}
|
||||
|
||||
|
||||
@ -1400,22 +1388,22 @@ static lu_mem fullgen (lua_State *L, global_State *g) {
|
||||
** ('g->lastatomic != 0' also means that the last collection was bad.)
|
||||
*/
|
||||
static void stepgenfull (lua_State *L, global_State *g) {
|
||||
lu_mem newatomic; /* count of traversed objects */
|
||||
lu_mem lastatomic = g->lastatomic; /* count from last collection */
|
||||
if (g->gckind == KGC_GEN) /* still in generational mode? */
|
||||
enterinc(g); /* enter incremental mode */
|
||||
luaC_runtilstate(L, bitmask(GCSpropagate)); /* start new cycle */
|
||||
newatomic = atomic(L); /* mark everybody */
|
||||
if (newatomic < lastatomic + (lastatomic >> 3)) { /* good collection? */
|
||||
g->marked = 0;
|
||||
atomic(L); /* mark everybody */
|
||||
if (g->marked < lastatomic + (lastatomic >> 3)) { /* good collection? */
|
||||
atomic2gen(L, g); /* return to generational mode */
|
||||
setminordebt(g);
|
||||
}
|
||||
else { /* another bad collection; stay in incremental mode */
|
||||
g->GCestimate = gettotalbytes(g); /* first estimate */;
|
||||
g->GCestimate = gettotalobjs(g); /* first estimate */;
|
||||
g->lastatomic = g->marked;
|
||||
entersweep(L);
|
||||
luaC_runtilstate(L, bitmask(GCSpause)); /* finish collection */
|
||||
setpause(g);
|
||||
g->lastatomic = newatomic;
|
||||
}
|
||||
}
|
||||
|
||||
@ -1443,21 +1431,23 @@ static void genstep (lua_State *L, global_State *g) {
|
||||
if (g->lastatomic != 0) /* last collection was a bad one? */
|
||||
stepgenfull(L, g); /* do a full step */
|
||||
else {
|
||||
lu_mem majorbase = g->GCestimate; /* memory after last major collection */
|
||||
lu_mem majorinc = (majorbase / 100) * getgcparam(g->genmajormul);
|
||||
if (g->GCdebt > 0 && gettotalbytes(g) > majorbase + majorinc) {
|
||||
lu_mem numobjs = fullgen(L, g); /* do a major collection */
|
||||
if (gettotalbytes(g) < majorbase + (majorinc / 2)) {
|
||||
/* collected at least half of memory growth since last major
|
||||
l_mem majorbase = g->GCestimate; /* objects after last major collection */
|
||||
l_mem majorinc = (majorbase / 100) * getgcparam(g->genmajormul);
|
||||
if (g->GCdebt > 0 && gettotalobjs(g) > majorbase + majorinc) {
|
||||
g->marked = 0;
|
||||
fullgen(L, g); /* do a major collection */
|
||||
if (gettotalobjs(g) < majorbase + (majorinc / 2)) {
|
||||
/* collected at least half of object growth since last major
|
||||
collection; keep doing minor collections. */
|
||||
lua_assert(g->lastatomic == 0);
|
||||
}
|
||||
else { /* bad collection */
|
||||
g->lastatomic = numobjs; /* signal that last collection was bad */
|
||||
g->lastatomic = g->marked; /* signal that last collection was bad */
|
||||
setpause(g); /* do a long wait for next (major) collection */
|
||||
}
|
||||
}
|
||||
else { /* regular case; do a minor collection */
|
||||
g->marked = 0;
|
||||
youngcollection(L, g);
|
||||
setminordebt(g);
|
||||
g->GCestimate = majorbase; /* preserve base value */
|
||||
@ -1522,9 +1512,9 @@ void luaC_freeallobjects (lua_State *L) {
|
||||
}
|
||||
|
||||
|
||||
static lu_mem atomic (lua_State *L) {
|
||||
static l_mem atomic (lua_State *L) {
|
||||
l_mem work = 0;
|
||||
global_State *g = G(L);
|
||||
lu_mem work = 0;
|
||||
GCObject *origweak, *origall;
|
||||
GCObject *grayagain = g->grayagain; /* save original list */
|
||||
g->grayagain = NULL;
|
||||
@ -1541,50 +1531,47 @@ static lu_mem atomic (lua_State *L) {
|
||||
work += propagateall(g); /* propagate changes */
|
||||
g->gray = grayagain;
|
||||
work += propagateall(g); /* traverse 'grayagain' list */
|
||||
convergeephemerons(g);
|
||||
work += convergeephemerons(g);
|
||||
/* at this point, all strongly accessible objects are marked. */
|
||||
/* Clear values from weak tables, before checking finalizers */
|
||||
clearbyvalues(g, g->weak, NULL);
|
||||
clearbyvalues(g, g->allweak, NULL);
|
||||
work += clearbyvalues(g, g->weak, NULL);
|
||||
work += clearbyvalues(g, g->allweak, NULL);
|
||||
origweak = g->weak; origall = g->allweak;
|
||||
separatetobefnz(g, 0); /* separate objects to be finalized */
|
||||
work += markbeingfnz(g); /* mark objects that will be finalized */
|
||||
work += propagateall(g); /* remark, to propagate 'resurrection' */
|
||||
convergeephemerons(g);
|
||||
work += convergeephemerons(g);
|
||||
/* at this point, all resurrected objects are marked. */
|
||||
/* remove dead objects from weak tables */
|
||||
clearbykeys(g, g->ephemeron); /* clear keys from all ephemeron tables */
|
||||
clearbykeys(g, g->allweak); /* clear keys from all 'allweak' tables */
|
||||
work += clearbykeys(g, g->ephemeron); /* clear keys from all ephemeron */
|
||||
work += clearbykeys(g, g->allweak); /* clear keys from all 'allweak' */
|
||||
/* clear values from resurrected weak tables */
|
||||
clearbyvalues(g, g->weak, origweak);
|
||||
clearbyvalues(g, g->allweak, origall);
|
||||
work += clearbyvalues(g, g->weak, origweak);
|
||||
work += clearbyvalues(g, g->allweak, origall);
|
||||
luaS_clearcache(g);
|
||||
g->currentwhite = cast_byte(otherwhite(g)); /* flip current white */
|
||||
lua_assert(g->gray == NULL);
|
||||
return work; /* estimate of slots marked by 'atomic' */
|
||||
return work;
|
||||
}
|
||||
|
||||
|
||||
static int sweepstep (lua_State *L, global_State *g,
|
||||
int nextstate, GCObject **nextlist) {
|
||||
static void sweepstep (lua_State *L, global_State *g,
|
||||
int nextstate, GCObject **nextlist) {
|
||||
if (g->sweepgc) {
|
||||
l_mem olddebt = g->GCdebt;
|
||||
int count;
|
||||
g->sweepgc = sweeplist(L, g->sweepgc, GCSWEEPMAX, &count);
|
||||
g->sweepgc = sweeplist(L, g->sweepgc, GCSWEEPMAX);
|
||||
g->GCestimate += g->GCdebt - olddebt; /* update estimate */
|
||||
return count;
|
||||
}
|
||||
else { /* enter next state */
|
||||
g->gcstate = nextstate;
|
||||
g->sweepgc = nextlist;
|
||||
return 0; /* no work done */
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static lu_mem singlestep (lua_State *L) {
|
||||
static l_mem singlestep (lua_State *L) {
|
||||
global_State *g = G(L);
|
||||
lu_mem work;
|
||||
l_mem work;
|
||||
lua_assert(!g->gcstopem); /* collector is not reentrant */
|
||||
g->gcstopem = 1; /* no emergency collections while collecting */
|
||||
switch (g->gcstate) {
|
||||
@ -1599,26 +1586,30 @@ static lu_mem singlestep (lua_State *L) {
|
||||
g->gcstate = GCSenteratomic; /* finish propagate phase */
|
||||
work = 0;
|
||||
}
|
||||
else
|
||||
work = propagatemark(g); /* traverse one gray object */
|
||||
else {
|
||||
propagatemark(g); /* traverse one gray object */
|
||||
work = 1;
|
||||
}
|
||||
break;
|
||||
}
|
||||
case GCSenteratomic: {
|
||||
work = atomic(L); /* work is what was traversed by 'atomic' */
|
||||
work = atomic(L);
|
||||
entersweep(L);
|
||||
g->GCestimate = gettotalbytes(g); /* first estimate */;
|
||||
break;
|
||||
}
|
||||
case GCSswpallgc: { /* sweep "regular" objects */
|
||||
work = sweepstep(L, g, GCSswpfinobj, &g->finobj);
|
||||
sweepstep(L, g, GCSswpfinobj, &g->finobj);
|
||||
work = GCSWEEPMAX;
|
||||
break;
|
||||
}
|
||||
case GCSswpfinobj: { /* sweep objects with finalizers */
|
||||
work = sweepstep(L, g, GCSswptobefnz, &g->tobefnz);
|
||||
sweepstep(L, g, GCSswptobefnz, &g->tobefnz);
|
||||
work = GCSWEEPMAX;
|
||||
break;
|
||||
}
|
||||
case GCSswptobefnz: { /* sweep objects to be finalized */
|
||||
work = sweepstep(L, g, GCSswpend, NULL);
|
||||
sweepstep(L, g, GCSswpend, NULL);
|
||||
work = GCSWEEPMAX;
|
||||
break;
|
||||
}
|
||||
case GCSswpend: { /* finish sweeps */
|
||||
@ -1630,7 +1621,8 @@ static lu_mem singlestep (lua_State *L) {
|
||||
case GCScallfin: { /* call remaining finalizers */
|
||||
if (g->tobefnz && !g->gcemergency) {
|
||||
g->gcstopem = 0; /* ok collections during finalizers */
|
||||
work = runafewfinalizers(L, GCFINMAX) * GCFINALIZECOST;
|
||||
runafewfinalizers(L, GCFINMAX);
|
||||
work = GCFINMAX * GCFINALIZECOST;
|
||||
}
|
||||
else { /* emergency mode or no more finalizers */
|
||||
g->gcstate = GCSpause; /* finish collection */
|
||||
@ -1666,18 +1658,16 @@ void luaC_runtilstate (lua_State *L, int statesmask) {
|
||||
*/
|
||||
static void incstep (lua_State *L, global_State *g) {
|
||||
int stepmul = (getgcparam(g->gcstepmul) | 1); /* avoid division by 0 */
|
||||
l_mem debt = (g->GCdebt / WORK2MEM) * stepmul;
|
||||
l_mem stepsize = (g->gcstepsize <= log2maxs(l_mem))
|
||||
? ((cast(l_mem, 1) << g->gcstepsize) / WORK2MEM) * stepmul
|
||||
: MAX_LMEM; /* overflow; keep maximum value */
|
||||
l_mem debt = (g->GCdebt / 100) * stepmul;
|
||||
l_mem stepsize = cast(l_mem, 1) << g->gcstepsize;
|
||||
do { /* repeat until pause or enough "credit" (negative debt) */
|
||||
lu_mem work = singlestep(L); /* perform one single step */
|
||||
l_mem work = singlestep(L); /* perform one single step */
|
||||
debt -= work;
|
||||
} while (debt > -stepsize && g->gcstate != GCSpause);
|
||||
if (g->gcstate == GCSpause)
|
||||
setpause(g); /* pause until next cycle */
|
||||
else {
|
||||
debt = (debt / stepmul) * WORK2MEM; /* convert 'work units' to bytes */
|
||||
debt = (debt / stepmul) * 100; /* apply step multiplier */
|
||||
luaE_setdebt(g, debt);
|
||||
}
|
||||
}
|
||||
@ -1710,9 +1700,8 @@ static void fullinc (lua_State *L, global_State *g) {
|
||||
/* finish any pending sweep phase to start a new cycle */
|
||||
luaC_runtilstate(L, bitmask(GCSpause));
|
||||
luaC_runtilstate(L, bitmask(GCScallfin)); /* run up to finalizers */
|
||||
/* estimate must be correct after a full GC cycle */
|
||||
lua_assert(g->GCestimate == gettotalbytes(g));
|
||||
luaC_runtilstate(L, bitmask(GCSpause)); /* finish collection */
|
||||
/* estimate must be correct after a full GC cycle */
|
||||
setpause(g);
|
||||
}
|
||||
|
||||
|
||||
6
lgc.h
6
lgc.h
@ -135,10 +135,10 @@
|
||||
#define getgcparam(p) ((p) * 4)
|
||||
#define setgcparam(p,v) ((p) = (v) / 4)
|
||||
|
||||
#define LUAI_GCMUL 100
|
||||
#define LUAI_GCMUL 300
|
||||
|
||||
/* how much to allocate before next GC step (log2) */
|
||||
#define LUAI_GCSTEPSIZE 13 /* 8 KB */
|
||||
/* how many objects to allocate before next GC step (log2) */
|
||||
#define LUAI_GCSTEPSIZE 8 /* 256 objects */
|
||||
|
||||
|
||||
/*
|
||||
|
||||
@ -57,7 +57,7 @@ typedef signed char ls_byte;
|
||||
** floor of the log2 of the maximum signed value for integral type 't'.
|
||||
** (That is, maximum 'n' such that '2^n' fits in the given signed type.)
|
||||
*/
|
||||
#define log2maxs(t) (sizeof(t) * 8 - 2)
|
||||
#define log2maxs(t) cast_int(sizeof(t) * 8 - 2)
|
||||
|
||||
|
||||
/*
|
||||
|
||||
8
lmem.c
8
lmem.c
@ -133,7 +133,7 @@ void luaM_free_ (lua_State *L, void *block, size_t osize) {
|
||||
global_State *g = G(L);
|
||||
lua_assert((osize == 0) == (block == NULL));
|
||||
(*g->frealloc)(g->ud, block, osize, 0);
|
||||
g->GCdebt -= osize;
|
||||
g->totalbytes -= osize;
|
||||
}
|
||||
|
||||
|
||||
@ -167,10 +167,10 @@ void *luaM_realloc_ (lua_State *L, void *block, size_t osize, size_t nsize) {
|
||||
if (l_unlikely(newblock == NULL && nsize > 0)) {
|
||||
newblock = tryagain(L, block, osize, nsize);
|
||||
if (newblock == NULL) /* still no memory? */
|
||||
return NULL; /* do not update 'GCdebt' */
|
||||
return NULL; /* do not update 'totalbytes' */
|
||||
}
|
||||
lua_assert((nsize == 0) == (newblock == NULL));
|
||||
g->GCdebt = (g->GCdebt + nsize) - osize;
|
||||
g->totalbytes += nsize - osize;
|
||||
return newblock;
|
||||
}
|
||||
|
||||
@ -195,7 +195,7 @@ void *luaM_malloc_ (lua_State *L, size_t size, int tag) {
|
||||
if (newblock == NULL)
|
||||
luaM_error(L);
|
||||
}
|
||||
g->GCdebt += size;
|
||||
g->totalbytes += size;
|
||||
return newblock;
|
||||
}
|
||||
}
|
||||
|
||||
15
lstate.c
15
lstate.c
@ -83,15 +83,15 @@ static unsigned int luai_makeseed (lua_State *L) {
|
||||
|
||||
|
||||
/*
|
||||
** set GCdebt to a new value keeping the value (totalbytes + GCdebt)
|
||||
** invariant (and avoiding underflows in 'totalbytes')
|
||||
** set GCdebt to a new value keeping the value (totalobjs + GCdebt)
|
||||
** invariant (and avoiding underflows in 'totalobjs')
|
||||
*/
|
||||
void luaE_setdebt (global_State *g, l_mem debt) {
|
||||
l_mem tb = gettotalbytes(g);
|
||||
l_mem tb = gettotalobjs(g);
|
||||
lua_assert(tb > 0);
|
||||
if (debt < tb - MAX_LMEM)
|
||||
debt = tb - MAX_LMEM; /* will make 'totalbytes == MAX_LMEM' */
|
||||
g->totalbytes = tb - debt;
|
||||
debt = tb - MAX_LMEM; /* will make 'totalobjs == MAX_LMEM' */
|
||||
g->totalobjs = tb - debt;
|
||||
g->GCdebt = debt;
|
||||
}
|
||||
|
||||
@ -278,8 +278,8 @@ static void close_state (lua_State *L) {
|
||||
}
|
||||
luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size);
|
||||
freestack(L);
|
||||
lua_assert(gettotalbytes(g) == sizeof(LG));
|
||||
lua_assert(g->totalobjs == 1);
|
||||
lua_assert(g->totalbytes == sizeof(LG));
|
||||
lua_assert(gettotalobjs(g) == 1);
|
||||
(*g->frealloc)(g->ud, fromstate(L), sizeof(LG), 0); /* free main block */
|
||||
}
|
||||
|
||||
@ -389,6 +389,7 @@ LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
|
||||
g->twups = NULL;
|
||||
g->totalbytes = sizeof(LG);
|
||||
g->totalobjs = 1;
|
||||
g->marked = 0;
|
||||
g->GCdebt = 0;
|
||||
g->lastatomic = 0;
|
||||
setivalue(&g->nilvalue, 0); /* to signal that state is not yet built */
|
||||
|
||||
10
lstate.h
10
lstate.h
@ -249,9 +249,10 @@ typedef struct CallInfo {
|
||||
typedef struct global_State {
|
||||
lua_Alloc frealloc; /* function to reallocate memory */
|
||||
void *ud; /* auxiliary data to 'frealloc' */
|
||||
l_mem totalbytes; /* number of bytes currently allocated - GCdebt */
|
||||
l_mem totalobjs; /* total number of objects allocated */
|
||||
l_mem totalbytes; /* number of bytes currently allocated */
|
||||
l_mem totalobjs; /* total number of objects allocated - GCdebt */
|
||||
l_mem GCdebt; /* bytes allocated not yet compensated by the collector */
|
||||
lu_mem marked; /* number of objects marked in a GC cycle */
|
||||
lu_mem GCestimate; /* an estimate of the non-garbage memory in use */
|
||||
lu_mem lastatomic; /* see function 'genstep' in file 'lgc.c' */
|
||||
stringtable strt; /* hash table for strings */
|
||||
@ -386,8 +387,9 @@ union GCUnion {
|
||||
#define obj2gco(v) check_exp((v)->tt >= LUA_TSTRING, &(cast_u(v)->gc))
|
||||
|
||||
|
||||
/* actual number of total bytes allocated */
|
||||
#define gettotalbytes(g) cast(lu_mem, (g)->totalbytes + (g)->GCdebt)
|
||||
/* actual number of total objects allocated */
|
||||
#define gettotalobjs(g) ((g)->totalobjs + (g)->GCdebt)
|
||||
|
||||
|
||||
LUAI_FUNC void luaE_setdebt (global_State *g, l_mem debt);
|
||||
LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);
|
||||
|
||||
11
ltests.c
11
ltests.c
@ -1027,6 +1027,16 @@ static int table_query (lua_State *L) {
|
||||
}
|
||||
|
||||
|
||||
static int query_inc (lua_State *L) {
|
||||
global_State *g = G(L);
|
||||
lua_pushinteger(L, gettotalobjs(g));
|
||||
lua_pushinteger(L, g->GCdebt);
|
||||
lua_pushinteger(L, getgcparam(g->gcpause));
|
||||
lua_pushinteger(L, getgcparam(g->gcstepmul));
|
||||
lua_pushinteger(L, cast(l_mem, 1) << g->gcstepsize);
|
||||
return 5;
|
||||
}
|
||||
|
||||
static int string_query (lua_State *L) {
|
||||
stringtable *tb = &G(L)->strt;
|
||||
int s = cast_int(luaL_optinteger(L, 1, 0)) - 1;
|
||||
@ -1933,6 +1943,7 @@ static const struct luaL_Reg tests_funcs[] = {
|
||||
{"pushuserdata", pushuserdata},
|
||||
{"querystr", string_query},
|
||||
{"querytab", table_query},
|
||||
{"queryinc", query_inc},
|
||||
{"ref", tref},
|
||||
{"resume", coresume},
|
||||
{"s2d", s2d},
|
||||
|
||||
4
lua.c
4
lua.c
@ -633,7 +633,8 @@ static int pmain (lua_State *L) {
|
||||
}
|
||||
luaL_openlibs(L); /* open standard libraries */
|
||||
createargtable(L, argv, argc, script); /* create table 'arg' */
|
||||
lua_gc(L, LUA_GCGEN, 0, 0); /* GC in generational mode */
|
||||
lua_gc(L, LUA_GCRESTART); /* start GC... */
|
||||
lua_gc(L, LUA_GCGEN, 0, 0); /* ...in generational mode */
|
||||
if (!(args & has_E)) { /* no option '-E'? */
|
||||
if (handle_luainit(L) != LUA_OK) /* run LUA_INIT */
|
||||
return 0; /* error running LUA_INIT */
|
||||
@ -665,6 +666,7 @@ int main (int argc, char **argv) {
|
||||
l_message(argv[0], "cannot create state: not enough memory");
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
lua_gc(L, LUA_GCSTOP); /* stop GC while buidling state */
|
||||
lua_pushcfunction(L, &pmain); /* to call 'pmain' in protected mode */
|
||||
lua_pushinteger(L, argc); /* 1st argument */
|
||||
lua_pushlightuserdata(L, argv); /* 2nd argument */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user