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more options for controling the GC

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This commit is contained in:
Roberto Ierusalimschy 2004-12-06 15:53:42 -02:00
parent 531874f6ce
commit 39a8082f50
7 changed files with 49 additions and 32 deletions
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12
lapi.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lapi.c,v 2.20 2004/11/24 18:55:56 roberto Exp roberto $
** $Id: lapi.c,v 2.21 2004/12/03 20:50:25 roberto Exp roberto $
** Lua API
** See Copyright Notice in lua.h
*/
@ -867,6 +867,16 @@ LUA_API int lua_gc (lua_State *L, int what, int data) {
luaC_step(L);
break;
}
case LUA_GCSETSTEPMUL: {
res = g->stepmul;
g->stepmul = data;
break;
}
case LUA_GCSETINCMODE: {
res = g->incgc;
g->incgc = data;
break;
}
default: res = -1; /* invalid option */
}
lua_unlock(L);

10
lbaselib.c
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@ -1,5 +1,5 @@
/*
** $Id: lbaselib.c,v 1.159 2004/09/29 21:03:14 roberto Exp roberto $
** $Id: lbaselib.c,v 1.160 2004/11/18 19:53:49 roberto Exp roberto $
** Basic library
** See Copyright Notice in lua.h
*/
@ -181,10 +181,10 @@ static int luaB_gcinfo (lua_State *L) {
static int luaB_collectgarbage (lua_State *L) {
static const char *const opts[] = {"stop", "restart", "collect", "count",
"step", NULL};
static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART,
LUA_GCCOLLECT, LUA_GCCOUNT, LUA_GCSTEP};
static const char *const opts[] = {"stop", "restart", "collect",
"count", "step", "setstepmul", "setincmode", NULL};
static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,
LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETSTEPMUL, LUA_GCSETINCMODE};
int o = luaL_findstring(luaL_optstring(L, 1, "collect"), opts);
int ex = luaL_optint(L, 2, 0);
luaL_argcheck(L, o >= 0, 1, "invalid option");

32
lgc.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lgc.c,v 2.16 2004/11/24 18:55:56 roberto Exp roberto $
** $Id: lgc.c,v 2.17 2004/11/24 19:20:21 roberto Exp roberto $
** Garbage Collector
** See Copyright Notice in lua.h
*/
@ -24,7 +24,6 @@
#define GCSTEPSIZE 1000
#define STEPMUL 2
#define GCSWEEPMAX 10
#define GCSWEEPCOST 30
#define GCFINALIZECOST 100
@ -65,7 +64,7 @@
static void removeentry (Node *n) {
setnilvalue(gval(n)); /* remove corresponding value ... */
if (iscollectable(gkey(n)))
setttype(gkey(n), LUA_TNONE); /* dead key; remove it */
setttype(gkey(n), LUA_TDEADKEY); /* dead key; remove it */
}
@ -184,6 +183,7 @@ static int traversetable (global_State *g, Table *h) {
i = sizenode(h);
while (i--) {
Node *n = gnode(h, i);
lua_assert(ttype(gkey(n)) != LUA_TDEADKEY || ttisnil(gval(n)));
if (ttisnil(gval(n)))
removeentry(n); /* remove empty entries */
else {
@ -555,7 +555,7 @@ static void atomic (lua_State *L) {
g->sweepgc = &g->rootgc;
g->gcstate = GCSsweepstring;
aux = g->gcgenerational;
g->gcgenerational = (g->estimate/2 <= g->prevestimate);
g->gcgenerational = g->incgc && (g->estimate/2 <= g->prevestimate);
if (!aux) /* last collection was full? */
g->prevestimate = g->estimate; /* keep estimate of last full collection */
g->estimate = g->totalbytes - udsize; /* first estimate */
@ -587,6 +587,7 @@ static l_mem singlestep (lua_State *L) {
sweepwholelist(L, &g->strt.hash[g->sweepstrgc++]);
if (g->sweepstrgc >= g->strt.size) /* nothing more to sweep? */
g->gcstate = GCSsweep; /* end sweep-string phase */
lua_assert(old >= g->totalbytes);
g->estimate -= old - g->totalbytes;
return GCSWEEPCOST;
}
@ -597,6 +598,7 @@ static l_mem singlestep (lua_State *L) {
checkSizes(L);
g->gcstate = GCSfinalize; /* end sweep phase */
}
lua_assert(old >= g->totalbytes);
g->estimate -= old - g->totalbytes;
return GCSWEEPMAX*GCSWEEPCOST;
}
@ -619,23 +621,18 @@ static l_mem singlestep (lua_State *L) {
void luaC_step (lua_State *L) {
global_State *g = G(L);
l_mem lim = (g->totalbytes - (g->GCthreshold - GCSTEPSIZE)) * STEPMUL;
/*printf("step(%c): ", g->gcgenerational?'g':' ');*/
l_mem lim = (g->totalbytes - (g->GCthreshold - GCSTEPSIZE)) * g->stepmul;
do {
/*printf("%c", "_pswf"[g->gcstate]);*/
lim -= singlestep(L);
if (g->gcstate == GCSpause)
break;
} while (lim > 0);
/*printf("\n");*/
if (g->gcstate != GCSpause)
} while (lim > 0 || !g->incgc);
if (g->incgc)
g->GCthreshold = g->totalbytes + GCSTEPSIZE; /* - lim/STEPMUL; */
else {
/*printf("---\n");*/
lua_assert(g->totalbytes >= g->estimate);
lua_assert(g->gcstate == GCSpause);
g->GCthreshold = 2*g->estimate;
if (g->GCthreshold < g->totalbytes + GCSTEPSIZE)
g->GCthreshold = g->totalbytes + GCSTEPSIZE;
}
}
@ -660,19 +657,19 @@ void luaC_fullgc (lua_State *L) {
}
markroot(L);
lua_assert(!g->gcgenerational);
while (g->gcstate != GCSfinalize) {
while (g->gcstate != GCSpause) {
singlestep(L);
g->gcgenerational = 0; /* keep it in this mode */
}
g->GCthreshold = 2*g->estimate;
luaC_callGCTM(L); /* call finalizers */
}
void luaC_barrierf (lua_State *L, GCObject *o, GCObject *v) {
global_State *g = G(L);
lua_assert(isblack(o) && iswhite(v) && !isdead(g, v) && !isdead(g, o));
lua_assert(g->gcgenerational || g->gcstate != GCSfinalize);
lua_assert(g->gcgenerational ||
(g->gcstate != GCSfinalize && g->gcstate != GCSpause));
lua_assert(ttype(&o->gch) != LUA_TTABLE);
/* must keep invariant? */
if (g->gcstate == GCSpropagate || g->gcgenerational)
@ -685,7 +682,8 @@ void luaC_barrierf (lua_State *L, GCObject *o, GCObject *v) {
void luaC_barrierback (lua_State *L, GCObject *o, GCObject *v) {
global_State *g = G(L);
lua_assert(isblack(o) && iswhite(v) && !isdead(g, v) && !isdead(g, o));
lua_assert(g->gcgenerational || g->gcstate != GCSfinalize);
lua_assert(g->gcgenerational ||
(g->gcstate != GCSfinalize && g->gcstate != GCSpause));
black2gray(o); /* make table gray (again) */
gco2h(o)->gclist = g->grayagain;
g->grayagain = o;

4
lstate.c
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@ -1,5 +1,5 @@
/*
** $Id: lstate.c,v 2.16 2004/11/19 15:52:40 roberto Exp roberto $
** $Id: lstate.c,v 2.17 2004/11/24 19:20:21 roberto Exp roberto $
** Global State
** See Copyright Notice in lua.h
*/
@ -193,6 +193,8 @@ LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
setnilvalue(gval(g->dummynode));
gnext(g->dummynode) = NULL;
g->totalbytes = sizeof(LG);
g->stepmul = STEPMUL;
g->incgc = 1;
if (luaD_rawrunprotected(L, f_luaopen, NULL) != 0) {
/* memory allocation error: free partial state */
close_state(L);

4
lstate.h
View File

@ -1,5 +1,5 @@
/*
** $Id: lstate.h,v 2.7 2004/08/30 13:44:44 roberto Exp roberto $
** $Id: lstate.h,v 2.8 2004/09/15 20:39:42 roberto Exp roberto $
** Global State
** See Copyright Notice in lua.h
*/
@ -85,6 +85,8 @@ typedef struct global_State {
lu_mem totalbytes; /* number of bytes currently allocated */
lu_mem estimate; /* an estimate of number of bytes actually in use */
lu_mem prevestimate; /* previous estimate */
int stepmul; /* relative `speed' of the GC */
int incgc; /* 0 if GC is done non-incrementally */
lua_CFunction panic; /* to be called in unprotected errors */
TValue _registry;
struct lua_State *mainthread;

14
lua.h
View File

@ -1,5 +1,5 @@
/*
** $Id: lua.h,v 1.194 2004/10/18 12:51:44 roberto Exp roberto $
** $Id: lua.h,v 1.195 2004/12/01 15:50:18 roberto Exp roberto $
** Lua - An Extensible Extension Language
** Tecgraf: Computer Graphics Technology Group, PUC-Rio, Brazil
** http://www.lua.org mailto:info@lua.org
@ -220,11 +220,13 @@ LUA_API int lua_threadstatus (lua_State *L);
** garbage-collection function and options
*/
#define LUA_GCSTOP 0
#define LUA_GCRESTART 1
#define LUA_GCCOLLECT 2
#define LUA_GCCOUNT 3
#define LUA_GCSTEP 4
#define LUA_GCSTOP 0
#define LUA_GCRESTART 1
#define LUA_GCCOLLECT 2
#define LUA_GCCOUNT 3
#define LUA_GCSTEP 4
#define LUA_GCSETSTEPMUL 5
#define LUA_GCSETINCMODE 6
LUA_API int lua_gc (lua_State *L, int what, int data);

5
luaconf.h
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@ -1,5 +1,5 @@
/*
** $Id: luaconf.h,v 1.18 2004/12/01 15:50:18 roberto Exp roberto $
** $Id: luaconf.h,v 1.19 2004/12/01 15:52:54 roberto Exp roberto $
** Configuration file for Lua
** See Copyright Notice in lua.h
*/
@ -273,6 +273,9 @@
#define lua_userstateopen(L) /* empty */
/* initial GC parameters */
#define STEPMUL 4
#endif
/* }====================================================== */