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📄 arena_externs.h(4.83 KB)
📄 arena_inlines_a.h(1.44 KB)
📄 arena_inlines_b.h(11.54 KB)
📄 arena_stats.h(7.92 KB)
📄 arena_structs_a.h(293 B)
📄 arena_structs_b.h(6.63 KB)
📄 arena_types.h(1.67 KB)
📄 assert.h(1.3 KB)
📄 atomic.h(2.66 KB)
📄 atomic_c11.h(3.46 KB)
📄 atomic_gcc_atomic.h(4.06 KB)
📄 atomic_gcc_sync.h(6.21 KB)
📄 background_thread_externs.h(1.29 KB)
📄 background_thread_inlines.h(2.09 KB)
📄 background_thread_structs.h(1.74 KB)
📄 base_externs.h(946 B)
📄 base_inlines.h(312 B)
📄 base_structs.h(1.52 KB)
📄 base_types.h(1.08 KB)
📄 bin.h(3.6 KB)
📄 bin_stats.h(1.35 KB)
📄 bin_types.h(474 B)
📄 bit_util.h(5.22 KB)
📄 bitmap.h(10.97 KB)
📄 cache_bin.h(3.69 KB)
📄 ckh.h(3.19 KB)
📄 ctl.h(3.62 KB)
📄 div.h(1.14 KB)
📄 emitter.h(13.06 KB)
📄 extent_dss.h(728 B)
📄 extent_externs.h(3.75 KB)
📄 extent_inlines.h(13.4 KB)
📄 extent_mmap.h(328 B)
📄 extent_structs.h(8.46 KB)
📄 extent_types.h(700 B)
📄 hash.h(7.88 KB)
📄 hook.h(5.41 KB)
📄 jemalloc_internal_decls.h(2.19 KB)
📄 jemalloc_internal_defs.h(10.93 KB)
📄 jemalloc_internal_defs_FreeBSD.h(256 B)
📄 jemalloc_internal_externs.h(1.75 KB)
📄 jemalloc_internal_includes.h(4.19 KB)
📄 jemalloc_internal_inlines_a.h(4.39 KB)
📄 jemalloc_internal_inlines_b.h(2.24 KB)
📄 jemalloc_internal_inlines_c.h(7.08 KB)
📄 jemalloc_internal_macros.h(3.99 KB)
📄 jemalloc_internal_types.h(3.42 KB)
📄 jemalloc_preamble.h(3.9 KB)
📄 large_externs.h(1.4 KB)
📄 log.h(3.67 KB)
📄 malloc_io.h(2.9 KB)
📄 mutex.h(9.34 KB)
📄 mutex_pool.h(2.81 KB)
📄 mutex_prof.h(3.55 KB)
📄 nstime.h(1.27 KB)
📄 pages.h(3.05 KB)
📄 ph.h(12.26 KB)
📄 private_namespace.h(22.72 KB)
📄 prng.h(4.69 KB)
📄 prof_externs.h(3.79 KB)
📄 prof_inlines_a.h(2.44 KB)
📄 prof_inlines_b.h(6.42 KB)
📄 prof_structs.h(5.02 KB)
📄 prof_types.h(1.74 KB)
📄 public_namespace.h(1.03 KB)
📄 ql.h(2.45 KB)
📄 qr.h(2.29 KB)
📄 quantum.h(1.75 KB)
📄 rb.h(37.41 KB)
📄 rtree.h(17.01 KB)
📄 rtree_tsd.h(1.82 KB)
📄 safety_check.h(797 B)
📄 sc.h(12.98 KB)
📄 seq.h(1.81 KB)
📄 smoothstep.h(15.26 KB)
📄 spin.h(613 B)
📄 stats.h(998 B)
📄 sz.h(7.96 KB)
📄 tcache_externs.h(2.09 KB)
📄 tcache_inlines.h(5.73 KB)
📄 tcache_structs.h(2.05 KB)
📄 tcache_types.h(2.01 KB)
📄 test_hooks.h(459 B)
📄 ticker.h(2.21 KB)
📄 tsd.h(12.49 KB)
📄 tsd_generic.h(3.76 KB)
📄 tsd_malloc_thread_cleanup.h(1.19 KB)
📄 tsd_tls.h(1.12 KB)
📄 tsd_types.h(258 B)
📄 util.h(1.43 KB)
📄 witness.h(9.32 KB)

Editing: extent_structs.h

#ifndef JEMALLOC_INTERNAL_EXTENT_STRUCTS_H
#define JEMALLOC_INTERNAL_EXTENT_STRUCTS_H

#include "jemalloc/internal/atomic.h"
#include "jemalloc/internal/bit_util.h"
#include "jemalloc/internal/bitmap.h"
#include "jemalloc/internal/mutex.h"
#include "jemalloc/internal/ql.h"
#include "jemalloc/internal/ph.h"
#include "jemalloc/internal/sc.h"

typedef enum {
	extent_state_active   = 0,
	extent_state_dirty    = 1,
	extent_state_muzzy    = 2,
	extent_state_retained = 3
} extent_state_t;

/* Extent (span of pages).  Use accessor functions for e_* fields. */
struct extent_s {
	/*
	 * Bitfield containing several fields:
	 *
	 * a: arena_ind
	 * b: slab
	 * c: committed
	 * d: dumpable
	 * z: zeroed
	 * t: state
	 * i: szind
	 * f: nfree
	 * s: bin_shard
	 * n: sn
	 *
	 * nnnnnnnn ... nnnnnnss ssssffff ffffffii iiiiiitt zdcbaaaa aaaaaaaa
	 *
	 * arena_ind: Arena from which this extent came, or all 1 bits if
	 *            unassociated.
	 *
	 * slab: The slab flag indicates whether the extent is used for a slab
	 *       of small regions.  This helps differentiate small size classes,
	 *       and it indicates whether interior pointers can be looked up via
	 *       iealloc().
	 *
	 * committed: The committed flag indicates whether physical memory is
	 *            committed to the extent, whether explicitly or implicitly
	 *            as on a system that overcommits and satisfies physical
	 *            memory needs on demand via soft page faults.
	 *
	 * dumpable: The dumpable flag indicates whether or not we've set the
	 *           memory in question to be dumpable.  Note that this
	 *           interacts somewhat subtly with user-specified extent hooks,
	 *           since we don't know if *they* are fiddling with
	 *           dumpability (in which case, we don't want to undo whatever
	 *           they're doing).  To deal with this scenario, we:
	 *             - Make dumpable false only for memory allocated with the
	 *               default hooks.
	 *             - Only allow memory to go from non-dumpable to dumpable,
	 *               and only once.
	 *             - Never make the OS call to allow dumping when the
	 *               dumpable bit is already set.
	 *           These three constraints mean that we will never
	 *           accidentally dump user memory that the user meant to set
	 *           nondumpable with their extent hooks.
	 *
	 *
	 * zeroed: The zeroed flag is used by extent recycling code to track
	 *         whether memory is zero-filled.
	 *
	 * state: The state flag is an extent_state_t.
	 *
	 * szind: The szind flag indicates usable size class index for
	 *        allocations residing in this extent, regardless of whether the
	 *        extent is a slab.  Extent size and usable size often differ
	 *        even for non-slabs, either due to sz_large_pad or promotion of
	 *        sampled small regions.
	 *
	 * nfree: Number of free regions in slab.
	 *
	 * bin_shard: the shard of the bin from which this extent came.
	 *
	 * sn: Serial number (potentially non-unique).
	 *
	 *     Serial numbers may wrap around if !opt_retain, but as long as
	 *     comparison functions fall back on address comparison for equal
	 *     serial numbers, stable (if imperfect) ordering is maintained.
	 *
	 *     Serial numbers may not be unique even in the absence of
	 *     wrap-around, e.g. when splitting an extent and assigning the same
	 *     serial number to both resulting adjacent extents.
	 */
	uint64_t		e_bits;
#define MASK(CURRENT_FIELD_WIDTH, CURRENT_FIELD_SHIFT) ((((((uint64_t)0x1U) << (CURRENT_FIELD_WIDTH)) - 1)) << (CURRENT_FIELD_SHIFT))

#define EXTENT_BITS_ARENA_WIDTH  MALLOCX_ARENA_BITS
#define EXTENT_BITS_ARENA_SHIFT  0
#define EXTENT_BITS_ARENA_MASK  MASK(EXTENT_BITS_ARENA_WIDTH, EXTENT_BITS_ARENA_SHIFT)

#define EXTENT_BITS_SLAB_WIDTH  1
#define EXTENT_BITS_SLAB_SHIFT  (EXTENT_BITS_ARENA_WIDTH + EXTENT_BITS_ARENA_SHIFT)
#define EXTENT_BITS_SLAB_MASK  MASK(EXTENT_BITS_SLAB_WIDTH, EXTENT_BITS_SLAB_SHIFT)

#define EXTENT_BITS_COMMITTED_WIDTH  1
#define EXTENT_BITS_COMMITTED_SHIFT  (EXTENT_BITS_SLAB_WIDTH + EXTENT_BITS_SLAB_SHIFT)
#define EXTENT_BITS_COMMITTED_MASK  MASK(EXTENT_BITS_COMMITTED_WIDTH, EXTENT_BITS_COMMITTED_SHIFT)

#define EXTENT_BITS_DUMPABLE_WIDTH  1
#define EXTENT_BITS_DUMPABLE_SHIFT  (EXTENT_BITS_COMMITTED_WIDTH + EXTENT_BITS_COMMITTED_SHIFT)
#define EXTENT_BITS_DUMPABLE_MASK  MASK(EXTENT_BITS_DUMPABLE_WIDTH, EXTENT_BITS_DUMPABLE_SHIFT)

#define EXTENT_BITS_ZEROED_WIDTH  1
#define EXTENT_BITS_ZEROED_SHIFT  (EXTENT_BITS_DUMPABLE_WIDTH + EXTENT_BITS_DUMPABLE_SHIFT)
#define EXTENT_BITS_ZEROED_MASK  MASK(EXTENT_BITS_ZEROED_WIDTH, EXTENT_BITS_ZEROED_SHIFT)

#define EXTENT_BITS_STATE_WIDTH  2
#define EXTENT_BITS_STATE_SHIFT  (EXTENT_BITS_ZEROED_WIDTH + EXTENT_BITS_ZEROED_SHIFT)
#define EXTENT_BITS_STATE_MASK  MASK(EXTENT_BITS_STATE_WIDTH, EXTENT_BITS_STATE_SHIFT)

#define EXTENT_BITS_SZIND_WIDTH  LG_CEIL(SC_NSIZES)
#define EXTENT_BITS_SZIND_SHIFT  (EXTENT_BITS_STATE_WIDTH + EXTENT_BITS_STATE_SHIFT)
#define EXTENT_BITS_SZIND_MASK  MASK(EXTENT_BITS_SZIND_WIDTH, EXTENT_BITS_SZIND_SHIFT)

#define EXTENT_BITS_NFREE_WIDTH  (LG_SLAB_MAXREGS + 1)
#define EXTENT_BITS_NFREE_SHIFT  (EXTENT_BITS_SZIND_WIDTH + EXTENT_BITS_SZIND_SHIFT)
#define EXTENT_BITS_NFREE_MASK  MASK(EXTENT_BITS_NFREE_WIDTH, EXTENT_BITS_NFREE_SHIFT)

#define EXTENT_BITS_BINSHARD_WIDTH  6
#define EXTENT_BITS_BINSHARD_SHIFT  (EXTENT_BITS_NFREE_WIDTH + EXTENT_BITS_NFREE_SHIFT)
#define EXTENT_BITS_BINSHARD_MASK  MASK(EXTENT_BITS_BINSHARD_WIDTH, EXTENT_BITS_BINSHARD_SHIFT)

#define EXTENT_BITS_IS_HEAD_WIDTH 1
#define EXTENT_BITS_IS_HEAD_SHIFT  (EXTENT_BITS_BINSHARD_WIDTH + EXTENT_BITS_BINSHARD_SHIFT)
#define EXTENT_BITS_IS_HEAD_MASK  MASK(EXTENT_BITS_IS_HEAD_WIDTH, EXTENT_BITS_IS_HEAD_SHIFT)

#define EXTENT_BITS_SN_SHIFT   (EXTENT_BITS_IS_HEAD_WIDTH + EXTENT_BITS_IS_HEAD_SHIFT)
#define EXTENT_BITS_SN_MASK  (UINT64_MAX << EXTENT_BITS_SN_SHIFT)

/* Pointer to the extent that this structure is responsible for. */
	void			*e_addr;

union {
		/*
		 * Extent size and serial number associated with the extent
		 * structure (different than the serial number for the extent at
		 * e_addr).
		 *
		 * ssssssss [...] ssssssss ssssnnnn nnnnnnnn
		 */
		size_t			e_size_esn;
	#define EXTENT_SIZE_MASK	((size_t)~(PAGE-1))
	#define EXTENT_ESN_MASK		((size_t)PAGE-1)
		/* Base extent size, which may not be a multiple of PAGE. */
		size_t			e_bsize;
	};

/*
	 * List linkage, used by a variety of lists:
	 * - bin_t's slabs_full
	 * - extents_t's LRU
	 * - stashed dirty extents
	 * - arena's large allocations
	 */
	ql_elm(extent_t)	ql_link;

/*
	 * Linkage for per size class sn/address-ordered heaps, and
	 * for extent_avail
	 */
	phn(extent_t)		ph_link;

union {
		/* Small region slab metadata. */
		arena_slab_data_t	e_slab_data;

/* Profiling data, used for large objects. */
		struct {
			/* Time when this was allocated. */
			nstime_t		e_alloc_time;
			/* Points to a prof_tctx_t. */
			atomic_p_t		e_prof_tctx;
		};
	};
};
typedef ql_head(extent_t) extent_list_t;
typedef ph(extent_t) extent_tree_t;
typedef ph(extent_t) extent_heap_t;

/* Quantized collection of extents, with built-in LRU queue. */
struct extents_s {
	malloc_mutex_t		mtx;

/*
	 * Quantized per size class heaps of extents.
	 *
	 * Synchronization: mtx.
	 */
	extent_heap_t		heaps[SC_NPSIZES + 1];
	atomic_zu_t		nextents[SC_NPSIZES + 1];
	atomic_zu_t		nbytes[SC_NPSIZES + 1];

/*
	 * Bitmap for which set bits correspond to non-empty heaps.
	 *
	 * Synchronization: mtx.
	 */
	bitmap_t		bitmap[BITMAP_GROUPS(SC_NPSIZES + 1)];

/*
	 * LRU of all extents in heaps.
	 *
	 * Synchronization: mtx.
	 */
	extent_list_t		lru;

/*
	 * Page sum for all extents in heaps.
	 *
	 * The synchronization here is a little tricky.  Modifications to npages
	 * must hold mtx, but reads need not (though, a reader who sees npages
	 * without holding the mutex can't assume anything about the rest of the
	 * state of the extents_t).
	 */
	atomic_zu_t		npages;

/* All stored extents must be in the same state. */
	extent_state_t		state;

/*
	 * If true, delay coalescing until eviction; otherwise coalesce during
	 * deallocation.
	 */
	bool			delay_coalesce;
};

/*
 * The following two structs are for experimental purposes. See
 * experimental_utilization_query_ctl and
 * experimental_utilization_batch_query_ctl in src/ctl.c.
 */

struct extent_util_stats_s {
	size_t nfree;
	size_t nregs;
	size_t size;
};

struct extent_util_stats_verbose_s {
	void *slabcur_addr;
	size_t nfree;
	size_t nregs;
	size_t size;
	size_t bin_nfree;
	size_t bin_nregs;
};

#endif /* JEMALLOC_INTERNAL_EXTENT_STRUCTS_H */

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