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https://github.com/netsurf-browser/netsurf
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4fb38f574a
Neither freeing slabs nor purging the cache are safe to call from interrupts, so instead we schedule these to run on NetSurf's process. If NetSurf is busy, there may be significant delay, so the priority is set low to ensure this is called only when other - faster - memory handlers have been exhausted. I don't know if this works, or is sane, as I'm not entirely sure how to test it. Something similar needs adding for OS4 but low memory is less of an issue there, so will see if this works on OS3 first.
137 lines
3.8 KiB
C
Executable File
137 lines
3.8 KiB
C
Executable File
/*
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* Copyright 2016 Chris Young <chris@unsatisfactorysoftware.co.uk>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __amigaos4__
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#include <proto/exec.h>
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#include <exec/interrupts.h>
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#include <stdlib.h>
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#include "amiga/memory.h"
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#include "amiga/os3support.h"
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#include "amiga/schedule.h"
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#include "content/llcache.h"
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#include "utils/log.h"
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ULONG __slab_max_size = 2048; /* Enable clib2's slab allocator */
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enum {
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PURGE_NONE = 0,
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PURGE_STEP1,
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PURGE_STEP2,
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PURGE_DONE_STEP1,
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PURGE_DONE_STEP2
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};
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static int low_mem_status = PURGE_NONE;
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/* Special clear (ie. non-zero) */
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void *ami_memory_clear_alloc(size_t size, UBYTE value)
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{
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void *mem = malloc(size);
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if (mem) memset(mem, value, size);
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return mem;
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}
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/* clib2 slab allocator stats */
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static int ami_memory_slab_callback(const struct __slab_usage_information * sui)
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{
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if(sui->sui_slab_index <= 1) {
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LOG("clib2 slab usage:");
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LOG(" The size of all slabs, in bytes: %ld", sui->sui_slab_size);
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LOG(" Number of allocations which are not managed by slabs: %ld",
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sui->sui_num_single_allocations);
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LOG(" Total number of bytes allocated for memory not managed by slabs: %ld",
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sui->sui_total_single_allocation_size);
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LOG(" Number of slabs currently in play: %ld", sui->sui_num_slabs);
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LOG(" Number of currently unused slabs: %ld", sui->sui_num_empty_slabs);
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LOG(" Number of slabs in use which are completely filled with data: %ld",
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sui->sui_num_full_slabs);
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LOG(" Total number of bytes allocated for all slabs: %ld",
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sui->sui_total_slab_allocation_size);
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}
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LOG("Slab %d", sui->sui_slab_index);
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LOG(" Memory chunk size managed by this slab: %ld", sui->sui_chunk_size);
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LOG(" Number of memory chunks that fit in this slab: %ld", sui->sui_num_chunks);
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LOG(" Number of memory chunks used in this slab: %ld", sui->sui_num_chunks_used);
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return 0;
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}
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void ami_memory_slab_dump(void)
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{
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__get_slab_usage(ami_memory_slab_callback);
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}
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static void ami_memory_low_mem_handler(void *p)
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{
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if(low_mem_status == PURGE_STEP1) {
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LOG("Purging llcache");
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llcache_clean(true);
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low_mem_status = PURGE_DONE_STEP1;
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}
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if(low_mem_status == PURGE_STEP2) {
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LOG("Purging unused slabs");
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__free_unused_slabs();
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low_mem_status = PURGE_DONE_STEP2;
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}
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}
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static ASM ULONG ami_memory_handler(REG(a0, struct MemHandlerData *mhd), REG(a1, void *userdata), REG(a6, struct ExecBase *execbase))
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{
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if(low_mem_status == PURGE_DONE_STEP2) {
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low_mem_status = PURGE_NONE;
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return MEM_ALL_DONE;
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}
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if(low_mem_status == PURGE_DONE_STEP1) {
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low_mem_status = PURGE_STEP2;
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}
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if(low_mem_status == PURGE_NONE) {
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low_mem_status = PURGE_STEP1;
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}
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ami_schedule(1, ami_memory_low_mem_handler, NULL);
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return MEM_TRY_AGAIN;
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}
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struct Interrupt *ami_memory_init(void)
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{
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struct Interrupt *memhandler = malloc(sizeof(struct Interrupt));
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if(memhandler == NULL) return NULL; // we're screwed
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memhandler->is_Node.ln_Pri = -100; // low down as will be slow
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memhandler->is_Node.ln_Name = "NetSurf low memory handler";
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memhandler->is_Data = NULL;
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memhandler->is_Code = (APTR)&ami_memory_handler;
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AddMemHandler(memhandler);
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return memhandler;
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}
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void ami_memory_fini(struct Interrupt *memhandler)
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{
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if(memhandler != NULL) {
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RemMemHandler(memhandler);
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free(memhandler);
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}
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}
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#endif
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