278 lines
7.5 KiB
C
278 lines
7.5 KiB
C
#ifndef JEMALLOC_INTERNAL_ARENA_STRUCTS_B_H
|
|
#define JEMALLOC_INTERNAL_ARENA_STRUCTS_B_H
|
|
|
|
#include "jemalloc/internal/atomic.h"
|
|
#include "jemalloc/internal/bitmap.h"
|
|
#include "jemalloc/internal/jemalloc_internal_types.h"
|
|
#include "jemalloc/internal/nstime.h"
|
|
#include "jemalloc/internal/ql.h"
|
|
#include "jemalloc/internal/size_classes.h"
|
|
#include "jemalloc/internal/smoothstep.h"
|
|
#include "jemalloc/internal/stats.h"
|
|
#include "jemalloc/internal/ticker.h"
|
|
|
|
/*
|
|
* Read-only information associated with each element of arena_t's bins array
|
|
* is stored separately, partly to reduce memory usage (only one copy, rather
|
|
* than one per arena), but mainly to avoid false cacheline sharing.
|
|
*
|
|
* Each slab has the following layout:
|
|
*
|
|
* /--------------------\
|
|
* | region 0 |
|
|
* |--------------------|
|
|
* | region 1 |
|
|
* |--------------------|
|
|
* | ... |
|
|
* | ... |
|
|
* | ... |
|
|
* |--------------------|
|
|
* | region nregs-1 |
|
|
* \--------------------/
|
|
*/
|
|
struct arena_bin_info_s {
|
|
/* Size of regions in a slab for this bin's size class. */
|
|
size_t reg_size;
|
|
|
|
/* Total size of a slab for this bin's size class. */
|
|
size_t slab_size;
|
|
|
|
/* Total number of regions in a slab for this bin's size class. */
|
|
uint32_t nregs;
|
|
|
|
/*
|
|
* Metadata used to manipulate bitmaps for slabs associated with this
|
|
* bin.
|
|
*/
|
|
bitmap_info_t bitmap_info;
|
|
};
|
|
|
|
struct arena_decay_s {
|
|
/* Synchronizes all non-atomic fields. */
|
|
malloc_mutex_t mtx;
|
|
/*
|
|
* True if a thread is currently purging the extents associated with
|
|
* this decay structure.
|
|
*/
|
|
bool purging;
|
|
/*
|
|
* Approximate time in seconds from the creation of a set of unused
|
|
* dirty pages until an equivalent set of unused dirty pages is purged
|
|
* and/or reused.
|
|
*/
|
|
atomic_zd_t time;
|
|
/* time / SMOOTHSTEP_NSTEPS. */
|
|
nstime_t interval;
|
|
/*
|
|
* Time at which the current decay interval logically started. We do
|
|
* not actually advance to a new epoch until sometime after it starts
|
|
* because of scheduling and computation delays, and it is even possible
|
|
* to completely skip epochs. In all cases, during epoch advancement we
|
|
* merge all relevant activity into the most recently recorded epoch.
|
|
*/
|
|
nstime_t epoch;
|
|
/* Deadline randomness generator. */
|
|
uint64_t jitter_state;
|
|
/*
|
|
* Deadline for current epoch. This is the sum of interval and per
|
|
* epoch jitter which is a uniform random variable in [0..interval).
|
|
* Epochs always advance by precise multiples of interval, but we
|
|
* randomize the deadline to reduce the likelihood of arenas purging in
|
|
* lockstep.
|
|
*/
|
|
nstime_t deadline;
|
|
/*
|
|
* Number of unpurged pages at beginning of current epoch. During epoch
|
|
* advancement we use the delta between arena->decay_*.nunpurged and
|
|
* extents_npages_get(&arena->extents_*) to determine how many dirty
|
|
* pages, if any, were generated.
|
|
*/
|
|
size_t nunpurged;
|
|
/*
|
|
* Trailing log of how many unused dirty pages were generated during
|
|
* each of the past SMOOTHSTEP_NSTEPS decay epochs, where the last
|
|
* element is the most recent epoch. Corresponding epoch times are
|
|
* relative to epoch.
|
|
*/
|
|
size_t backlog[SMOOTHSTEP_NSTEPS];
|
|
|
|
/*
|
|
* Pointer to associated stats. These stats are embedded directly in
|
|
* the arena's stats due to how stats structures are shared between the
|
|
* arena and ctl code.
|
|
*
|
|
* Synchronization: Same as associated arena's stats field. */
|
|
decay_stats_t *stats;
|
|
};
|
|
|
|
struct arena_bin_s {
|
|
/* All operations on arena_bin_t fields require lock ownership. */
|
|
malloc_mutex_t lock;
|
|
|
|
/*
|
|
* Current slab being used to service allocations of this bin's size
|
|
* class. slabcur is independent of slabs_{nonfull,full}; whenever
|
|
* slabcur is reassigned, the previous slab must be deallocated or
|
|
* inserted into slabs_{nonfull,full}.
|
|
*/
|
|
extent_t *slabcur;
|
|
|
|
/*
|
|
* Heap of non-full slabs. This heap is used to assure that new
|
|
* allocations come from the non-full slab that is oldest/lowest in
|
|
* memory.
|
|
*/
|
|
extent_heap_t slabs_nonfull;
|
|
|
|
/* List used to track full slabs. */
|
|
extent_list_t slabs_full;
|
|
|
|
/* Bin statistics. */
|
|
malloc_bin_stats_t stats;
|
|
};
|
|
|
|
struct arena_s {
|
|
/*
|
|
* Number of threads currently assigned to this arena. Each thread has
|
|
* two distinct assignments, one for application-serving allocation, and
|
|
* the other for internal metadata allocation. Internal metadata must
|
|
* not be allocated from arenas explicitly created via the arenas.create
|
|
* mallctl, because the arena.<i>.reset mallctl indiscriminately
|
|
* discards all allocations for the affected arena.
|
|
*
|
|
* 0: Application allocation.
|
|
* 1: Internal metadata allocation.
|
|
*
|
|
* Synchronization: atomic.
|
|
*/
|
|
atomic_u_t nthreads[2];
|
|
|
|
/*
|
|
* When percpu_arena is enabled, to amortize the cost of reading /
|
|
* updating the current CPU id, track the most recent thread accessing
|
|
* this arena, and only read CPU if there is a mismatch.
|
|
*/
|
|
tsdn_t *last_thd;
|
|
|
|
/* Synchronization: internal. */
|
|
arena_stats_t stats;
|
|
|
|
/*
|
|
* List of tcaches for extant threads associated with this arena.
|
|
* Stats from these are merged incrementally, and at exit if
|
|
* opt_stats_print is enabled.
|
|
*
|
|
* Synchronization: tcache_ql_mtx.
|
|
*/
|
|
ql_head(tcache_t) tcache_ql;
|
|
malloc_mutex_t tcache_ql_mtx;
|
|
|
|
/* Synchronization: internal. */
|
|
prof_accum_t prof_accum;
|
|
uint64_t prof_accumbytes;
|
|
|
|
/*
|
|
* PRNG state for cache index randomization of large allocation base
|
|
* pointers.
|
|
*
|
|
* Synchronization: atomic.
|
|
*/
|
|
atomic_zu_t offset_state;
|
|
|
|
/*
|
|
* Extent serial number generator state.
|
|
*
|
|
* Synchronization: atomic.
|
|
*/
|
|
atomic_zu_t extent_sn_next;
|
|
|
|
/*
|
|
* Represents a dss_prec_t, but atomically.
|
|
*
|
|
* Synchronization: atomic.
|
|
*/
|
|
atomic_u_t dss_prec;
|
|
|
|
/*
|
|
* Number of pages in active extents.
|
|
*
|
|
* Synchronization: atomic.
|
|
*/
|
|
atomic_zu_t nactive;
|
|
|
|
/*
|
|
* Extant large allocations.
|
|
*
|
|
* Synchronization: large_mtx.
|
|
*/
|
|
extent_list_t large;
|
|
/* Synchronizes all large allocation/update/deallocation. */
|
|
malloc_mutex_t large_mtx;
|
|
|
|
/*
|
|
* Collections of extents that were previously allocated. These are
|
|
* used when allocating extents, in an attempt to re-use address space.
|
|
*
|
|
* Synchronization: internal.
|
|
*/
|
|
extents_t extents_dirty;
|
|
extents_t extents_muzzy;
|
|
extents_t extents_retained;
|
|
|
|
/*
|
|
* Decay-based purging state, responsible for scheduling extent state
|
|
* transitions.
|
|
*
|
|
* Synchronization: internal.
|
|
*/
|
|
arena_decay_t decay_dirty; /* dirty --> muzzy */
|
|
arena_decay_t decay_muzzy; /* muzzy --> retained */
|
|
|
|
/*
|
|
* Next extent size class in a growing series to use when satisfying a
|
|
* request via the extent hooks (only if !config_munmap). This limits
|
|
* the number of disjoint virtual memory ranges so that extent merging
|
|
* can be effective even if multiple arenas' extent allocation requests
|
|
* are highly interleaved.
|
|
*
|
|
* Synchronization: atomic.
|
|
*/
|
|
atomic_u_t extent_grow_next;
|
|
|
|
/*
|
|
* Available extent structures that were allocated via
|
|
* base_alloc_extent().
|
|
*
|
|
* Synchronization: extent_avail_mtx.
|
|
*/
|
|
extent_tree_t extent_avail;
|
|
malloc_mutex_t extent_avail_mtx;
|
|
|
|
/*
|
|
* bins is used to store heaps of free regions.
|
|
*
|
|
* Synchronization: internal.
|
|
*/
|
|
arena_bin_t bins[NBINS];
|
|
|
|
/*
|
|
* Base allocator, from which arena metadata are allocated.
|
|
*
|
|
* Synchronization: internal.
|
|
*/
|
|
base_t *base;
|
|
};
|
|
|
|
/* Used in conjunction with tsd for fast arena-related context lookup. */
|
|
struct arena_tdata_s {
|
|
ticker_t decay_ticker;
|
|
};
|
|
|
|
/* Used to pass rtree lookup context down the path. */
|
|
struct alloc_ctx_s {
|
|
szind_t szind;
|
|
bool slab;
|
|
};
|
|
|
|
#endif /* JEMALLOC_INTERNAL_ARENA_STRUCTS_B_H */
|