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Bug 678422 - Avoid wasting half of nsPresArena's allocated memory due to clownshoes. r=roc.

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This commit is contained in:
Nicholas Nethercote 2011-08-11 18:53:29 -07:00
parent 832db26255
commit 4947a42a40
1 changed files with 5 additions and 1 deletions
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6
layout/base/nsPresArena.cpp
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@ -83,7 +83,11 @@
#endif
// Size to use for PLArena block allocations.
static const size_t ARENA_PAGE_SIZE = 4096;
// XXX: This should be 8192; the subtracted elements are a hack that's
// required to ensure the allocation requests are power-of-two-sized and thus
// avoid lots of wasted memory caused by the heap allocator rounding up request
// sizes. Bug 676457 will fix it properly.
static const size_t ARENA_PAGE_SIZE = 8192 - sizeof(PLArena) - PL_ARENA_CONST_ALIGN_MASK;
// Freed memory is filled with a poison value, which we arrange to
// form a pointer either to an always-unmapped region of the address