0043e68d4c
The -1 value of low_water indicates if the cache has been depleted and refilled. Track the status explicitly in the tcache struct. This allows the fast path to check if (cur_ptr > low_water), instead of >=, which avoids reaching slow path when the last item is allocated.
73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
#ifndef JEMALLOC_INTERNAL_TCACHE_STRUCTS_H
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#define JEMALLOC_INTERNAL_TCACHE_STRUCTS_H
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#include "jemalloc/internal/cache_bin.h"
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#include "jemalloc/internal/ql.h"
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#include "jemalloc/internal/sc.h"
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#include "jemalloc/internal/ticker.h"
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#include "jemalloc/internal/tsd_types.h"
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/* Various uses of this struct need it to be a named type. */
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typedef ql_elm(tsd_t) tsd_link_t;
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struct tcache_s {
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/*
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* To minimize our cache-footprint, we put the frequently accessed data
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* together at the start of this struct.
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*/
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/* Cleared after arena_prof_accum(). */
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uint64_t prof_accumbytes;
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/* Drives incremental GC. */
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ticker_t gc_ticker;
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/*
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* The pointer stacks associated with bins follow as a contiguous array.
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* During tcache initialization, the avail pointer in each element of
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* tbins is initialized to point to the proper offset within this array.
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*/
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cache_bin_t bins_small[SC_NBINS];
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/*
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* This data is less hot; we can be a little less careful with our
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* footprint here.
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*/
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/* Lets us track all the tcaches in an arena. */
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ql_elm(tcache_t) link;
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/* Logically scoped to tsd, but put here for cache layout reasons. */
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ql_elm(tsd_t) tsd_link;
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bool in_hook;
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/*
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* The descriptor lets the arena find our cache bins without seeing the
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* tcache definition. This enables arenas to aggregate stats across
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* tcaches without having a tcache dependency.
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*/
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cache_bin_array_descriptor_t cache_bin_array_descriptor;
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/* The arena this tcache is associated with. */
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arena_t *arena;
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/* Next bin to GC. */
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szind_t next_gc_bin;
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/* For small bins, fill (ncached_max >> lg_fill_div). */
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uint8_t lg_fill_div[SC_NBINS];
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/* For small bins, whether has been refilled since last GC. */
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bool bin_refilled[SC_NBINS];
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/*
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* We put the cache bins for large size classes at the end of the
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* struct, since some of them might not get used. This might end up
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* letting us avoid touching an extra page if we don't have to.
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*/
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cache_bin_t bins_large[SC_NSIZES-SC_NBINS];
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};
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/* Linkage for list of available (previously used) explicit tcache IDs. */
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struct tcaches_s {
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union {
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tcache_t *tcache;
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tcaches_t *next;
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};
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};
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#endif /* JEMALLOC_INTERNAL_TCACHE_STRUCTS_H */
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