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Pull out caching for a bin into its own file.

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This is the first step towards breaking up the tcache and arena (since they
interact primarily at the bin level).  It should also make a future arena
caching implementation more straightforward.
This commit is contained in:
David Goldblatt 2017-08-10 14:27:58 -07:00 • committed by David Goldblatt
parent b0825351d9
commit f3170baa30
11 changed files with 148 additions and 139 deletions
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40
include/jemalloc/internal/tcache_structs.h
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@ -3,54 +3,26 @@
#include "jemalloc/internal/ql.h"
#include "jemalloc/internal/size_classes.h"
#include "jemalloc/internal/stats_tsd.h"
#include "jemalloc/internal/cache_bin.h"
#include "jemalloc/internal/ticker.h"
/*
* Read-only information associated with each element of tcache_t's tbins array
* is stored separately, mainly to reduce memory usage.
*/
struct tcache_bin_info_s {
unsigned ncached_max; /* Upper limit on ncached. */
};
struct tcache_bin_s {
low_water_t low_water; /* Min # cached since last GC. */
uint32_t ncached; /* # of cached objects. */
/*
* ncached and stats are both modified frequently. Let's keep them
* close so that they have a higher chance of being on the same
* cacheline, thus less write-backs.
*/
tcache_bin_stats_t tstats;
/*
* To make use of adjacent cacheline prefetch, the items in the avail
* stack goes to higher address for newer allocations. avail points
* just above the available space, which means that
* avail[-ncached, ... -1] are available items and the lowest item will
* be allocated first.
*/
void **avail; /* Stack of available objects. */
};
struct tcache_s {
/* Data accessed frequently first: prof, ticker and small bins. */
uint64_t prof_accumbytes;/* Cleared after arena_prof_accum(). */
ticker_t gc_ticker; /* Drives incremental GC. */
/*
* The pointer stacks associated with tbins follow as a contiguous
* array. During tcache initialization, the avail pointer in each
* element of tbins is initialized to point to the proper offset within
* this array.
* The pointer stacks associated with bins follow as a contiguous array.
* During tcache initialization, the avail pointer in each element of
* tbins is initialized to point to the proper offset within this array.
*/
tcache_bin_t tbins_small[NBINS];
cache_bin_t bins_small[NBINS];
/* Data accessed less often below. */
ql_elm(tcache_t) link; /* Used for aggregating stats. */
arena_t *arena; /* Associated arena. */
szind_t next_gc_bin; /* Next bin to GC. */
/* For small bins, fill (ncached_max >> lg_fill_div). */
uint8_t lg_fill_div[NBINS];
tcache_bin_t tbins_large[NSIZES-NBINS];
cache_bin_t bins_large[NSIZES-NBINS];
};
/* Linkage for list of available (previously used) explicit tcache IDs. */