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Refactor arena_mapbits unzeroed flag management.

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Only set the unzeroed flag when initializing the entire mapbits entry,
rather than mutating just the unzeroed bit.  This simplifies the
possible mapbits state transitions.
This commit is contained in:
Jason Evans 2015-08-10 23:03:34 -07:00
parent de249c8679
commit 45186f0c07
4 changed files with 35 additions and 37 deletions
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25
include/jemalloc/internal/arena.h
View file

@ -534,14 +534,14 @@ void arena_mapbits_unallocated_set(arena_chunk_t *chunk, size_t pageind,
size_t size, size_t flags);
void arena_mapbits_unallocated_size_set(arena_chunk_t *chunk, size_t pageind,
size_t size);
void arena_mapbits_internal_set(arena_chunk_t *chunk, size_t pageind,
size_t flags);
void arena_mapbits_large_set(arena_chunk_t *chunk, size_t pageind,
size_t size, size_t flags);
void arena_mapbits_large_binind_set(arena_chunk_t *chunk, size_t pageind,
index_t binind);
void arena_mapbits_small_set(arena_chunk_t *chunk, size_t pageind,
size_t runind, index_t binind, size_t flags);
void arena_mapbits_unzeroed_set(arena_chunk_t *chunk, size_t pageind,
size_t unzeroed);
void arena_metadata_allocated_add(arena_t *arena, size_t size);
void arena_metadata_allocated_sub(arena_t *arena, size_t size);
size_t arena_metadata_allocated_get(arena_t *arena);
@ -783,6 +783,15 @@ arena_mapbits_unallocated_size_set(arena_chunk_t *chunk, size_t pageind,
& ~CHUNK_MAP_SIZE_MASK));
}
JEMALLOC_ALWAYS_INLINE void
arena_mapbits_internal_set(arena_chunk_t *chunk, size_t pageind, size_t flags)
{
size_t *mapbitsp = arena_mapbitsp_get(chunk, pageind);
assert((flags & CHUNK_MAP_UNZEROED) == flags);
arena_mapbitsp_write(mapbitsp, flags);
}
JEMALLOC_ALWAYS_INLINE void
arena_mapbits_large_set(arena_chunk_t *chunk, size_t pageind, size_t size,
size_t flags)
@ -831,18 +840,6 @@ arena_mapbits_small_set(arena_chunk_t *chunk, size_t pageind, size_t runind,
CHUNK_MAP_ALLOCATED);
}
JEMALLOC_ALWAYS_INLINE void
arena_mapbits_unzeroed_set(arena_chunk_t *chunk, size_t pageind,
size_t unzeroed)
{
size_t *mapbitsp = arena_mapbitsp_get(chunk, pageind);
size_t mapbits = arena_mapbitsp_read(mapbitsp);
assert((mapbits & CHUNK_MAP_DECOMMITTED) == 0 || !unzeroed);
arena_mapbitsp_write(mapbitsp, (mapbits & ~CHUNK_MAP_UNZEROED) |
unzeroed);
}
JEMALLOC_INLINE void
arena_metadata_allocated_add(arena_t *arena, size_t size)
{

2
include/jemalloc/internal/private_symbols.txt
View file

@ -42,6 +42,7 @@ arena_mapbits_binind_get
arena_mapbits_decommitted_get
arena_mapbits_dirty_get
arena_mapbits_get
arena_mapbits_internal_set
arena_mapbits_large_binind_set
arena_mapbits_large_get
arena_mapbits_large_set
@ -52,7 +53,6 @@ arena_mapbits_unallocated_set
arena_mapbits_unallocated_size_get
arena_mapbits_unallocated_size_set
arena_mapbits_unzeroed_get
arena_mapbits_unzeroed_set
arena_mapbitsp_get
arena_mapbitsp_read
arena_mapbitsp_write