project-base/server-skynet-source-3rd-jemalloc
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Don't purge junk filled chunks when shrinking huge allocations

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When junk filling is enabled, shrinking an allocation fills the bytes
that were previously allocated but now aren't. Purging the chunk before
doing that is just a waste of time.

This resolves #260.
This commit is contained in:
Mike Hommey 2015-08-28 13:45:51 +09:00 committed by Jason Evans
parent 6d8075f1e6
commit 4a2a3c9a6e
2 changed files with 12 additions and 6 deletions
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14
src/huge.c
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@ -148,11 +148,12 @@ huge_ralloc_no_move_similar(void *ptr, size_t oldsize, size_t usize,
/* Fill if necessary (shrinking). */
if (oldsize > usize) {
size_t sdiff = oldsize - usize;
zeroed = !chunk_purge_wrapper(arena, &chunk_hooks, ptr,
CHUNK_CEILING(oldsize), usize, sdiff);
if (config_fill && unlikely(opt_junk_free)) {
memset((void *)((uintptr_t)ptr + usize), 0x5a, sdiff);
zeroed = false;
} else {
zeroed = !chunk_purge_wrapper(arena, &chunk_hooks, ptr,
CHUNK_CEILING(oldsize), usize, sdiff);
}
} else
zeroed = true;
@ -202,14 +203,15 @@ huge_ralloc_no_move_shrink(void *ptr, size_t oldsize, size_t usize)
if (oldsize > usize) {
size_t sdiff = oldsize - usize;
zeroed = !chunk_purge_wrapper(arena, &chunk_hooks,
CHUNK_ADDR2BASE((uintptr_t)ptr + usize),
CHUNK_CEILING(oldsize), CHUNK_ADDR2OFFSET((uintptr_t)ptr +
usize), sdiff);
if (config_fill && unlikely(opt_junk_free)) {
huge_dalloc_junk((void *)((uintptr_t)ptr + usize),
sdiff);
zeroed = false;
} else {
zeroed = !chunk_purge_wrapper(arena, &chunk_hooks,
CHUNK_ADDR2BASE((uintptr_t)ptr + usize),
CHUNK_CEILING(oldsize),
CHUNK_ADDR2OFFSET((uintptr_t)ptr + usize), sdiff);
}
} else
zeroed = true;

4
test/integration/chunk.c
View File

@ -1,5 +1,9 @@
#include "test/jemalloc_test.h"
#ifdef JEMALLOC_FILL
const char *malloc_conf = "junk:false";
#endif
static chunk_hooks_t orig_hooks;
static chunk_hooks_t old_hooks;