Avoid re-zeroing memory in calloc() when possible.
This commit is contained in:
Jason Evans
parent
1bbd1b8613
commit
bcd3523138
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=173965
@ -374,16 +374,26 @@ typedef struct arena_bin_s arena_bin_t;
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typedef struct arena_chunk_map_s arena_chunk_map_t;
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struct arena_chunk_map_s {
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/* Number of pages in run. */
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/*
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* Number of pages in run. For a free run that has never been touched,
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* this is NPAGES_EMPTY for the central pages, which allows us to avoid
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* zero-filling untouched pages for calloc().
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*/
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#define NPAGES_EMPTY ((uint32_t)0x0U)
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uint32_t npages;
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/*
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* Position within run. For a free run, this is POS_FREE for the first
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* and last pages. The POS_FREE special value makes it possible to
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* quickly coalesce free runs.
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* Position within run. For a free run, this is POS_EMPTY/POS_FREE for
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* the first and last pages. The special values make it possible to
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* quickly coalesce free runs. POS_EMPTY indicates that the run has
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* never been touched, which allows us to avoid zero-filling untouched
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* pages for calloc().
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*
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* This is the limiting factor for chunksize; there can be at most 2^31
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* pages in a run.
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*
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* POS_EMPTY is assumed by arena_run_dalloc() to be less than POS_FREE.
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*/
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#define POS_EMPTY ((uint32_t)0xfffffffeU)
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#define POS_FREE ((uint32_t)0xffffffffU)
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uint32_t pos;
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};
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@ -729,15 +739,16 @@ static void chunk_dealloc(void *chunk, size_t size);
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#ifndef NO_TLS
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static arena_t *choose_arena_hard(void);
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#endif
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static void arena_run_split(arena_t *arena, arena_run_t *run, size_t size);
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static void arena_run_split(arena_t *arena, arena_run_t *run, size_t size,
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bool zero);
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static arena_chunk_t *arena_chunk_alloc(arena_t *arena);
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static void arena_chunk_dealloc(arena_t *arena, arena_chunk_t *chunk);
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static arena_run_t *arena_run_alloc(arena_t *arena, size_t size);
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static arena_run_t *arena_run_alloc(arena_t *arena, size_t size, bool zero);
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static void arena_run_dalloc(arena_t *arena, arena_run_t *run, size_t size);
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static arena_run_t *arena_bin_nonfull_run_get(arena_t *arena, arena_bin_t *bin);
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static void *arena_bin_malloc_hard(arena_t *arena, arena_bin_t *bin);
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static size_t arena_bin_run_size_calc(arena_bin_t *bin, size_t min_run_size);
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static void *arena_malloc(arena_t *arena, size_t size);
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static void *arena_malloc(arena_t *arena, size_t size, bool zero);
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static void *arena_palloc(arena_t *arena, size_t alignment, size_t size,
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size_t alloc_size);
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static size_t arena_salloc(const void *ptr);
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@ -745,7 +756,7 @@ static void *arena_ralloc(void *ptr, size_t size, size_t oldsize);
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static void arena_dalloc(arena_t *arena, arena_chunk_t *chunk, void *ptr);
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static bool arena_new(arena_t *arena);
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static arena_t *arenas_extend(unsigned ind);
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static void *huge_malloc(size_t size);
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static void *huge_malloc(size_t size, bool zero);
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static void *huge_palloc(size_t alignment, size_t size);
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static void *huge_ralloc(void *ptr, size_t size, size_t oldsize);
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static void huge_dalloc(void *ptr);
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@ -1202,6 +1213,11 @@ chunk_alloc(size_t size)
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&& (uintptr_t)chunk < (uintptr_t)brk_max) {
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/* Re-use a previously freed brk chunk. */
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ret = chunk;
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/*
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* Maintain invariant that all newly allocated
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* chunks are untouched or zero-filled.
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*/
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memset(ret, 0, size);
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goto RETURN;
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}
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#endif
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@ -1727,35 +1743,76 @@ arena_run_reg_dalloc(arena_run_t *run, arena_bin_t *bin, void *ptr, size_t size)
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}
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static void
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arena_run_split(arena_t *arena, arena_run_t *run, size_t size)
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arena_run_split(arena_t *arena, arena_run_t *run, size_t size, bool zero)
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{
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arena_chunk_t *chunk;
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unsigned run_ind, map_offset, total_pages, need_pages, rem_pages;
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unsigned i;
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uint32_t pos_beg, pos_end;
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chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(run);
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run_ind = (unsigned)(((uintptr_t)run - (uintptr_t)chunk)
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>> pagesize_2pow);
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total_pages = chunk->map[run_ind].npages;
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need_pages = (size >> pagesize_2pow);
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assert(need_pages > 0);
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assert(need_pages <= total_pages);
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rem_pages = total_pages - need_pages;
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/* Split enough pages from the front of run to fit allocation size. */
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map_offset = run_ind;
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pos_beg = chunk->map[map_offset].pos;
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pos_end = chunk->map[map_offset + total_pages - 1].pos;
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if (zero == false) {
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for (i = 0; i < need_pages; i++) {
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chunk->map[map_offset + i].npages = need_pages;
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chunk->map[map_offset + i].pos = i;
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}
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} else {
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/*
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* Handle first page specially, since we need to look for
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* POS_EMPTY rather than NPAGES_EMPTY.
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*/
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i = 0;
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if (chunk->map[map_offset + i].pos != POS_EMPTY) {
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memset((void *)((uintptr_t)chunk + ((map_offset + i) <<
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pagesize_2pow)), 0, pagesize);
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}
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chunk->map[map_offset + i].npages = need_pages;
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chunk->map[map_offset + i].pos = i;
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/* Handle central pages. */
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for (i++; i < need_pages - 1; i++) {
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if (chunk->map[map_offset + i].npages != NPAGES_EMPTY) {
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memset((void *)((uintptr_t)chunk + ((map_offset
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+ i) << pagesize_2pow)), 0, pagesize);
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}
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chunk->map[map_offset + i].npages = need_pages;
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chunk->map[map_offset + i].pos = i;
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}
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/*
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* Handle last page specially, since we need to look for
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* POS_EMPTY rather than NPAGES_EMPTY.
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*/
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if (i < need_pages) {
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if (chunk->map[map_offset + i].npages != POS_EMPTY) {
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memset((void *)((uintptr_t)chunk + ((map_offset
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+ i) << pagesize_2pow)), 0, pagesize);
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}
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chunk->map[map_offset + i].npages = need_pages;
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chunk->map[map_offset + i].pos = i;
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}
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}
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/* Keep track of trailing unused pages for later use. */
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if (rem_pages > 0) {
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/* Update map for trailing pages. */
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map_offset += need_pages;
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chunk->map[map_offset].npages = rem_pages;
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chunk->map[map_offset].pos = POS_FREE;
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chunk->map[map_offset].pos = pos_beg;
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chunk->map[map_offset + rem_pages - 1].npages = rem_pages;
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chunk->map[map_offset + rem_pages - 1].pos = POS_FREE;
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chunk->map[map_offset + rem_pages - 1].pos = pos_end;
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}
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chunk->pages_used += need_pages;
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@ -1772,6 +1829,8 @@ arena_chunk_alloc(arena_t *arena)
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RB_INSERT(arena_chunk_tree_s, &arena->chunks, chunk);
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} else {
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unsigned i;
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chunk = (arena_chunk_t *)chunk_alloc(chunksize);
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if (chunk == NULL)
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return (NULL);
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@ -1796,12 +1855,20 @@ arena_chunk_alloc(arena_t *arena)
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/*
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* Initialize enough of the map to support one maximal free run.
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*/
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chunk->map[arena_chunk_header_npages].npages = chunk_npages -
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i = arena_chunk_header_npages;
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chunk->map[i].npages = chunk_npages - arena_chunk_header_npages;
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chunk->map[i].pos = POS_EMPTY;
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/* Mark the free run's central pages as untouched. */
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for (i++; i < chunk_npages - 1; i++)
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chunk->map[i].npages = NPAGES_EMPTY;
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/* Take care when (chunk_npages == 2). */
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if (i < chunk_npages) {
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chunk->map[i].npages = chunk_npages -
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arena_chunk_header_npages;
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chunk->map[arena_chunk_header_npages].pos = POS_FREE;
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chunk->map[chunk_npages - 1].npages = chunk_npages -
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arena_chunk_header_npages;
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chunk->map[chunk_npages - 1].pos = POS_FREE;
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chunk->map[i].pos = POS_EMPTY;
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}
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}
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return (chunk);
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@ -1835,7 +1902,7 @@ arena_chunk_dealloc(arena_t *arena, arena_chunk_t *chunk)
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}
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static arena_run_t *
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arena_run_alloc(arena_t *arena, size_t size)
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arena_run_alloc(arena_t *arena, size_t size, bool zero)
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{
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arena_chunk_t *chunk;
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arena_run_t *run;
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@ -1869,14 +1936,14 @@ arena_run_alloc(arena_t *arena, size_t size)
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arena_chunk_header_npages);
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for (i = chunk->min_frun_ind; i < chunk_npages;) {
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mapelm = &chunk->map[i];
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if (mapelm->pos == POS_FREE) {
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if (mapelm->pos >= POS_EMPTY) {
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if (mapelm->npages >= need_npages) {
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run = (arena_run_t *)
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((uintptr_t)chunk + (i <<
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pagesize_2pow));
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/* Update page map. */
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arena_run_split(arena, run,
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size);
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size, zero);
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return (run);
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}
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if (mapelm->npages >
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@ -1910,7 +1977,7 @@ arena_run_alloc(arena_t *arena, size_t size)
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run = (arena_run_t *)((uintptr_t)chunk + (arena_chunk_header_npages <<
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pagesize_2pow));
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/* Update page map. */
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arena_run_split(arena, run, size);
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arena_run_split(arena, run, size, zero);
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return (run);
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}
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@ -1947,37 +2014,51 @@ arena_run_dalloc(arena_t *arena, arena_run_t *run, size_t size)
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/* Try to coalesce with neighboring runs. */
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if (run_ind > arena_chunk_header_npages &&
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chunk->map[run_ind - 1].pos == POS_FREE) {
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chunk->map[run_ind - 1].pos >= POS_EMPTY) {
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unsigned prev_npages;
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/* Coalesce with previous run. */
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prev_npages = chunk->map[run_ind - 1].npages;
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/*
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* The way run allocation currently works (lowest first fit),
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* it is impossible for a free run to have empty (untouched)
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* pages followed by dirty pages. If the run allocation policy
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* changes, then we will need to account for it here.
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*/
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assert(chunk->map[run_ind - 1].pos != POS_EMPTY);
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#if 0
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if (prev_npages > 1 && chunk->map[run_ind - 1].pos == POS_EMPTY)
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chunk->map[run_ind - 1].npages = NPAGES_EMPTY;
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#endif
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run_ind -= prev_npages;
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assert(chunk->map[run_ind].npages == prev_npages);
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assert(chunk->map[run_ind].pos == POS_FREE);
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assert(chunk->map[run_ind].pos >= POS_EMPTY);
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run_pages += prev_npages;
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chunk->map[run_ind].npages = run_pages;
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assert(chunk->map[run_ind].pos == POS_FREE);
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assert(chunk->map[run_ind].pos >= POS_EMPTY);
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chunk->map[run_ind + run_pages - 1].npages = run_pages;
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assert(chunk->map[run_ind + run_pages - 1].pos == POS_FREE);
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assert(chunk->map[run_ind + run_pages - 1].pos >= POS_EMPTY);
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}
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if (run_ind + run_pages < chunk_npages &&
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chunk->map[run_ind + run_pages].pos == POS_FREE) {
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chunk->map[run_ind + run_pages].pos >= POS_EMPTY) {
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unsigned next_npages;
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/* Coalesce with next run. */
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next_npages = chunk->map[run_ind + run_pages].npages;
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if (next_npages > 1 && chunk->map[run_ind + run_pages].pos ==
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POS_EMPTY)
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chunk->map[run_ind + run_pages].npages = NPAGES_EMPTY;
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run_pages += next_npages;
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assert(chunk->map[run_ind + run_pages - 1].npages ==
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next_npages);
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assert(chunk->map[run_ind + run_pages - 1].pos == POS_FREE);
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assert(chunk->map[run_ind + run_pages - 1].pos >= POS_EMPTY);
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chunk->map[run_ind].npages = run_pages;
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chunk->map[run_ind].pos = POS_FREE;
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assert(chunk->map[run_ind].pos >= POS_EMPTY);
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chunk->map[run_ind + run_pages - 1].npages = run_pages;
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assert(chunk->map[run_ind + run_pages - 1].pos == POS_FREE);
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assert(chunk->map[run_ind + run_pages - 1].pos >= POS_EMPTY);
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}
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if (chunk->map[run_ind].npages > chunk->max_frun_npages)
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@ -2008,7 +2089,7 @@ arena_bin_nonfull_run_get(arena_t *arena, arena_bin_t *bin)
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/* No existing runs have any space available. */
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/* Allocate a new run. */
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run = arena_run_alloc(arena, bin->run_size);
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run = arena_run_alloc(arena, bin->run_size, false);
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if (run == NULL)
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return (NULL);
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@ -2156,7 +2237,7 @@ arena_bin_run_size_calc(arena_bin_t *bin, size_t min_run_size)
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}
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static void *
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arena_malloc(arena_t *arena, size_t size)
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arena_malloc(arena_t *arena, size_t size, bool zero)
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{
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void *ret;
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@ -2214,11 +2295,20 @@ arena_malloc(arena_t *arena, size_t size)
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arena->stats.nmalloc_small++;
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arena->stats.allocated_small += size;
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#endif
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malloc_mutex_unlock(&arena->mtx);
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if (zero == false) {
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if (opt_junk)
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memset(ret, 0xa5, size);
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else if (opt_zero)
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memset(ret, 0, size);
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} else
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memset(ret, 0, size);
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} else {
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/* Large allocation. */
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size = PAGE_CEILING(size);
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malloc_mutex_lock(&arena->mtx);
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ret = (void *)arena_run_alloc(arena, size);
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ret = (void *)arena_run_alloc(arena, size, true); // XXX zero?
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if (ret == NULL) {
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malloc_mutex_unlock(&arena->mtx);
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return (NULL);
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@ -2227,14 +2317,16 @@ arena_malloc(arena_t *arena, size_t size)
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arena->stats.nmalloc_large++;
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arena->stats.allocated_large += size;
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#endif
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}
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malloc_mutex_unlock(&arena->mtx);
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if (zero == false) {
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if (opt_junk)
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memset(ret, 0xa5, size);
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else if (opt_zero)
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memset(ret, 0, size);
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}
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}
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return (ret);
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}
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@ -2273,7 +2365,7 @@ arena_palloc(arena_t *arena, size_t alignment, size_t size, size_t alloc_size)
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npages = size >> pagesize_2pow;
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malloc_mutex_lock(&arena->mtx);
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ret = (void *)arena_run_alloc(arena, alloc_size);
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ret = (void *)arena_run_alloc(arena, alloc_size, false);
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if (ret == NULL) {
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malloc_mutex_unlock(&arena->mtx);
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return (NULL);
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@ -2402,7 +2494,7 @@ arena_ralloc(void *ptr, size_t size, size_t oldsize)
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* need to use a different size class. In that case, fall back to
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* allocating new space and copying.
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*/
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ret = arena_malloc(choose_arena(), size);
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ret = arena_malloc(choose_arena(), size, false);
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if (ret == NULL)
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return (NULL);
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@ -2421,32 +2513,17 @@ arena_ralloc(void *ptr, size_t size, size_t oldsize)
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return (ptr);
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}
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static void
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arena_dalloc(arena_t *arena, arena_chunk_t *chunk, void *ptr)
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static inline void
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arena_dalloc_small(arena_t *arena, arena_chunk_t *chunk, void *ptr,
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unsigned pageind, arena_chunk_map_t *mapelm)
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{
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unsigned pageind;
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arena_chunk_map_t *mapelm;
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size_t size;
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assert(arena != NULL);
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assert(arena->magic == ARENA_MAGIC);
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assert(chunk->arena == arena);
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assert(ptr != NULL);
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assert(CHUNK_ADDR2BASE(ptr) != ptr);
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pageind = (((uintptr_t)ptr - (uintptr_t)chunk) >> pagesize_2pow);
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mapelm = &chunk->map[pageind];
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if (mapelm->pos != 0 || ptr != (void *)((uintptr_t)chunk) + (pageind <<
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pagesize_2pow)) {
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arena_run_t *run;
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arena_bin_t *bin;
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/* Small allocation. */
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size_t size;
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pageind -= mapelm->pos;
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run = (arena_run_t *)((uintptr_t)chunk + (pageind <<
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pagesize_2pow));
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run = (arena_run_t *)((uintptr_t)chunk + (pageind << pagesize_2pow));
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assert(run->magic == ARENA_RUN_MAGIC);
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bin = run->bin;
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size = bin->reg_size;
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@ -2454,7 +2531,6 @@ arena_dalloc(arena_t *arena, arena_chunk_t *chunk, void *ptr)
|
||||
if (opt_junk)
|
||||
memset(ptr, 0x5a, size);
|
||||
|
||||
malloc_mutex_lock(&arena->mtx);
|
||||
arena_run_reg_dalloc(run, bin, ptr, size);
|
||||
run->nfree++;
|
||||
|
||||
@ -2464,10 +2540,9 @@ arena_dalloc(arena_t *arena, arena_chunk_t *chunk, void *ptr)
|
||||
bin->runcur = NULL;
|
||||
else if (bin->nregs != 1) {
|
||||
/*
|
||||
* This block's conditional is necessary because
|
||||
* if the run only contains one region, then it
|
||||
* never gets inserted into the non-full runs
|
||||
* tree.
|
||||
* This block's conditional is necessary because if the
|
||||
* run only contains one region, then it never gets
|
||||
* inserted into the non-full runs tree.
|
||||
*/
|
||||
RB_REMOVE(arena_run_tree_s, &bin->runs, run);
|
||||
}
|
||||
@ -2480,8 +2555,8 @@ arena_dalloc(arena_t *arena, arena_chunk_t *chunk, void *ptr)
|
||||
#endif
|
||||
} else if (run->nfree == 1 && run != bin->runcur) {
|
||||
/*
|
||||
* Make sure that bin->runcur always refers to the
|
||||
* lowest non-full run, if one exists.
|
||||
* Make sure that bin->runcur always refers to the lowest
|
||||
* non-full run, if one exists.
|
||||
*/
|
||||
if (bin->runcur == NULL)
|
||||
bin->runcur = run;
|
||||
@ -2500,7 +2575,31 @@ arena_dalloc(arena_t *arena, arena_chunk_t *chunk, void *ptr)
|
||||
arena->stats.allocated_small -= size;
|
||||
arena->stats.ndalloc_small++;
|
||||
#endif
|
||||
}
|
||||
|
||||
static void
|
||||
arena_dalloc(arena_t *arena, arena_chunk_t *chunk, void *ptr)
|
||||
{
|
||||
unsigned pageind;
|
||||
arena_chunk_map_t *mapelm;
|
||||
|
||||
assert(arena != NULL);
|
||||
assert(arena->magic == ARENA_MAGIC);
|
||||
assert(chunk->arena == arena);
|
||||
assert(ptr != NULL);
|
||||
assert(CHUNK_ADDR2BASE(ptr) != ptr);
|
||||
|
||||
pageind = (((uintptr_t)ptr - (uintptr_t)chunk) >> pagesize_2pow);
|
||||
mapelm = &chunk->map[pageind];
|
||||
if (mapelm->pos != 0 || ptr != (void *)((uintptr_t)chunk) + (pageind <<
|
||||
pagesize_2pow)) {
|
||||
/* Small allocation. */
|
||||
malloc_mutex_lock(&arena->mtx);
|
||||
arena_dalloc_small(arena, chunk, ptr, pageind, mapelm);
|
||||
malloc_mutex_unlock(&arena->mtx);
|
||||
} else {
|
||||
size_t size;
|
||||
|
||||
/* Large allocation. */
|
||||
|
||||
size = mapelm->npages << pagesize_2pow;
|
||||
@ -2515,10 +2614,9 @@ arena_dalloc(arena_t *arena, arena_chunk_t *chunk, void *ptr)
|
||||
arena->stats.allocated_large -= size;
|
||||
arena->stats.ndalloc_large++;
|
||||
#endif
|
||||
}
|
||||
|
||||
malloc_mutex_unlock(&arena->mtx);
|
||||
}
|
||||
}
|
||||
|
||||
static bool
|
||||
arena_new(arena_t *arena)
|
||||
@ -2631,7 +2729,7 @@ arenas_extend(unsigned ind)
|
||||
*/
|
||||
|
||||
static void *
|
||||
huge_malloc(size_t size)
|
||||
huge_malloc(size_t size, bool zero)
|
||||
{
|
||||
void *ret;
|
||||
size_t csize;
|
||||
@ -2668,10 +2766,12 @@ huge_malloc(size_t size)
|
||||
#endif
|
||||
malloc_mutex_unlock(&chunks_mtx);
|
||||
|
||||
if (zero == false) {
|
||||
if (opt_junk)
|
||||
memset(ret, 0xa5, csize);
|
||||
else if (opt_zero)
|
||||
memset(ret, 0, csize);
|
||||
}
|
||||
|
||||
return (ret);
|
||||
}
|
||||
@ -2779,7 +2879,7 @@ huge_ralloc(void *ptr, size_t size, size_t oldsize)
|
||||
* need to use a different size class. In that case, fall back to
|
||||
* allocating new space and copying.
|
||||
*/
|
||||
ret = huge_malloc(size);
|
||||
ret = huge_malloc(size, false);
|
||||
if (ret == NULL)
|
||||
return (NULL);
|
||||
|
||||
@ -2838,9 +2938,9 @@ imalloc(size_t size)
|
||||
assert(size != 0);
|
||||
|
||||
if (size <= arena_maxclass)
|
||||
ret = arena_malloc(choose_arena(), size);
|
||||
ret = arena_malloc(choose_arena(), size, false);
|
||||
else
|
||||
ret = huge_malloc(size);
|
||||
ret = huge_malloc(size, false);
|
||||
|
||||
return (ret);
|
||||
}
|
||||
@ -2881,7 +2981,7 @@ ipalloc(size_t alignment, size_t size)
|
||||
|
||||
if (ceil_size <= pagesize || (alignment <= pagesize
|
||||
&& ceil_size <= arena_maxclass))
|
||||
ret = arena_malloc(choose_arena(), ceil_size);
|
||||
ret = arena_malloc(choose_arena(), ceil_size, false);
|
||||
else {
|
||||
size_t run_size;
|
||||
|
||||
@ -2931,7 +3031,7 @@ ipalloc(size_t alignment, size_t size)
|
||||
ret = arena_palloc(choose_arena(), alignment, ceil_size,
|
||||
run_size);
|
||||
} else if (alignment <= chunksize)
|
||||
ret = huge_malloc(ceil_size);
|
||||
ret = huge_malloc(ceil_size, false);
|
||||
else
|
||||
ret = huge_palloc(alignment, ceil_size);
|
||||
}
|
||||
@ -2945,35 +3045,10 @@ icalloc(size_t size)
|
||||
{
|
||||
void *ret;
|
||||
|
||||
if (size <= arena_maxclass) {
|
||||
ret = arena_malloc(choose_arena(), size);
|
||||
if (ret == NULL)
|
||||
return (NULL);
|
||||
memset(ret, 0, size);
|
||||
} else {
|
||||
/*
|
||||
* The virtual memory system provides zero-filled pages, so
|
||||
* there is no need to do so manually, unless opt_junk is
|
||||
* enabled, in which case huge_malloc() fills huge allocations
|
||||
* with junk.
|
||||
*/
|
||||
ret = huge_malloc(size);
|
||||
if (ret == NULL)
|
||||
return (NULL);
|
||||
|
||||
if (opt_junk)
|
||||
memset(ret, 0, size);
|
||||
#ifdef USE_BRK
|
||||
else if ((uintptr_t)ret >= (uintptr_t)brk_base
|
||||
&& (uintptr_t)ret < (uintptr_t)brk_max) {
|
||||
/*
|
||||
* This may be a re-used brk chunk. Therefore, zero
|
||||
* the memory.
|
||||
*/
|
||||
memset(ret, 0, size);
|
||||
}
|
||||
#endif
|
||||
}
|
||||
if (size <= arena_maxclass)
|
||||
ret = arena_malloc(choose_arena(), size, true);
|
||||
else
|
||||
ret = huge_malloc(size, true);
|
||||
|
||||
return (ret);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user