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Ensure page alignment on extent_alloc.

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This is discovered and suggested by @jasone in #1468.  When custom extent hooks
are in use, we should ensure page alignment on the extent alloc path, instead of
relying on the user hooks to do so.
This commit is contained in:
Qi Wang 2019-03-28 20:42:40 -07:00 committed by Qi Wang
parent 9aab3f2be0
commit 93084cdc89
3 changed files with 7 additions and 6 deletions
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7
src/extent.c
View File

@ -1256,7 +1256,7 @@ extent_alloc_default(extent_hooks_t *extent_hooks, void *new_addr, size_t size,
assert(arena != NULL);
return extent_alloc_default_impl(tsdn, arena, new_addr, size,
alignment, zero, commit);
ALIGNMENT_CEILING(alignment, PAGE), zero, commit);
}
static void
@ -1493,14 +1493,15 @@ extent_alloc_wrapper_hard(tsdn_t *tsdn, arena_t *arena,
return NULL;
}
void *addr;
size_t palignment = ALIGNMENT_CEILING(alignment, PAGE);
if (*r_extent_hooks == &extent_hooks_default) {
/* Call directly to propagate tsdn. */
addr = extent_alloc_default_impl(tsdn, arena, new_addr, esize,
alignment, zero, commit);
palignment, zero, commit);
} else {
extent_hook_pre_reentrancy(tsdn, arena);
addr = (*r_extent_hooks)->alloc(*r_extent_hooks, new_addr,
esize, alignment, zero, commit, arena_ind_get(arena));
esize, palignment, zero, commit, arena_ind_get(arena));
extent_hook_post_reentrancy(tsdn);
}
if (addr == NULL) {

2
src/extent_dss.c
View File

@ -113,7 +113,7 @@ extent_alloc_dss(tsdn_t *tsdn, arena_t *arena, void *new_addr, size_t size,
cassert(have_dss);
assert(size > 0);
assert(alignment > 0);
assert(alignment == ALIGNMENT_CEILING(alignment, PAGE));
/*
* sbrk() uses a signed increment argument, so take care not to

4
src/extent_mmap.c
View File

@ -21,8 +21,8 @@ bool opt_retain =
void *
extent_alloc_mmap(void *new_addr, size_t size, size_t alignment, bool *zero,
bool *commit) {
void *ret = pages_map(new_addr, size, ALIGNMENT_CEILING(alignment,
PAGE), commit);
assert(alignment == ALIGNMENT_CEILING(alignment, PAGE));
void *ret = pages_map(new_addr, size, alignment, commit);
if (ret == NULL) {
return NULL;
}