627 lines
19 KiB
C
627 lines
19 KiB
C
#ifndef JEMALLOC_INTERNAL_EXTENT_H
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#define JEMALLOC_INTERNAL_EXTENT_H
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#include "jemalloc/internal/atomic.h"
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#include "jemalloc/internal/bin_info.h"
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#include "jemalloc/internal/bit_util.h"
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#include "jemalloc/internal/nstime.h"
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#include "jemalloc/internal/ph.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/slab_data.h"
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#include "jemalloc/internal/sz.h"
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enum extent_state_e {
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extent_state_active = 0,
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extent_state_dirty = 1,
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extent_state_muzzy = 2,
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extent_state_retained = 3
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};
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typedef enum extent_state_e extent_state_t;
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enum extent_head_state_e {
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EXTENT_NOT_HEAD,
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EXTENT_IS_HEAD /* Only relevant for Windows && opt.retain. */
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};
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typedef enum extent_head_state_e extent_head_state_t;
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/* Extent (span of pages). Use accessor functions for e_* fields. */
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typedef struct extent_s extent_t;
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typedef ql_head(extent_t) extent_list_t;
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typedef ph(extent_t) extent_tree_t;
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typedef ph(extent_t) extent_heap_t;
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struct extent_s {
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/*
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* Bitfield containing several fields:
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*
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* a: arena_ind
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* b: slab
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* c: committed
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* d: dumpable
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* z: zeroed
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* t: state
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* i: szind
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* f: nfree
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* s: bin_shard
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* n: sn
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*
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* nnnnnnnn ... nnnnnnss ssssffff ffffffii iiiiiitt zdcbaaaa aaaaaaaa
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*
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* arena_ind: Arena from which this extent came, or all 1 bits if
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* unassociated.
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*
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* slab: The slab flag indicates whether the extent is used for a slab
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* of small regions. This helps differentiate small size classes,
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* and it indicates whether interior pointers can be looked up via
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* iealloc().
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*
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* committed: The committed flag indicates whether physical memory is
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* committed to the extent, whether explicitly or implicitly
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* as on a system that overcommits and satisfies physical
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* memory needs on demand via soft page faults.
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*
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* dumpable: The dumpable flag indicates whether or not we've set the
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* memory in question to be dumpable. Note that this
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* interacts somewhat subtly with user-specified extent hooks,
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* since we don't know if *they* are fiddling with
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* dumpability (in which case, we don't want to undo whatever
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* they're doing). To deal with this scenario, we:
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* - Make dumpable false only for memory allocated with the
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* default hooks.
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* - Only allow memory to go from non-dumpable to dumpable,
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* and only once.
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* - Never make the OS call to allow dumping when the
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* dumpable bit is already set.
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* These three constraints mean that we will never
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* accidentally dump user memory that the user meant to set
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* nondumpable with their extent hooks.
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*
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*
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* zeroed: The zeroed flag is used by extent recycling code to track
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* whether memory is zero-filled.
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*
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* state: The state flag is an extent_state_t.
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*
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* szind: The szind flag indicates usable size class index for
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* allocations residing in this extent, regardless of whether the
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* extent is a slab. Extent size and usable size often differ
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* even for non-slabs, either due to sz_large_pad or promotion of
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* sampled small regions.
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*
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* nfree: Number of free regions in slab.
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*
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* bin_shard: the shard of the bin from which this extent came.
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*
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* sn: Serial number (potentially non-unique).
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*
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* Serial numbers may wrap around if !opt_retain, but as long as
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* comparison functions fall back on address comparison for equal
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* serial numbers, stable (if imperfect) ordering is maintained.
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*
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* Serial numbers may not be unique even in the absence of
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* wrap-around, e.g. when splitting an extent and assigning the same
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* serial number to both resulting adjacent extents.
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*/
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uint64_t e_bits;
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#define MASK(CURRENT_FIELD_WIDTH, CURRENT_FIELD_SHIFT) ((((((uint64_t)0x1U) << (CURRENT_FIELD_WIDTH)) - 1)) << (CURRENT_FIELD_SHIFT))
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#define EXTENT_BITS_ARENA_WIDTH MALLOCX_ARENA_BITS
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#define EXTENT_BITS_ARENA_SHIFT 0
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#define EXTENT_BITS_ARENA_MASK MASK(EXTENT_BITS_ARENA_WIDTH, EXTENT_BITS_ARENA_SHIFT)
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#define EXTENT_BITS_SLAB_WIDTH 1
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#define EXTENT_BITS_SLAB_SHIFT (EXTENT_BITS_ARENA_WIDTH + EXTENT_BITS_ARENA_SHIFT)
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#define EXTENT_BITS_SLAB_MASK MASK(EXTENT_BITS_SLAB_WIDTH, EXTENT_BITS_SLAB_SHIFT)
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#define EXTENT_BITS_COMMITTED_WIDTH 1
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#define EXTENT_BITS_COMMITTED_SHIFT (EXTENT_BITS_SLAB_WIDTH + EXTENT_BITS_SLAB_SHIFT)
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#define EXTENT_BITS_COMMITTED_MASK MASK(EXTENT_BITS_COMMITTED_WIDTH, EXTENT_BITS_COMMITTED_SHIFT)
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#define EXTENT_BITS_DUMPABLE_WIDTH 1
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#define EXTENT_BITS_DUMPABLE_SHIFT (EXTENT_BITS_COMMITTED_WIDTH + EXTENT_BITS_COMMITTED_SHIFT)
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#define EXTENT_BITS_DUMPABLE_MASK MASK(EXTENT_BITS_DUMPABLE_WIDTH, EXTENT_BITS_DUMPABLE_SHIFT)
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#define EXTENT_BITS_ZEROED_WIDTH 1
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#define EXTENT_BITS_ZEROED_SHIFT (EXTENT_BITS_DUMPABLE_WIDTH + EXTENT_BITS_DUMPABLE_SHIFT)
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#define EXTENT_BITS_ZEROED_MASK MASK(EXTENT_BITS_ZEROED_WIDTH, EXTENT_BITS_ZEROED_SHIFT)
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#define EXTENT_BITS_STATE_WIDTH 2
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#define EXTENT_BITS_STATE_SHIFT (EXTENT_BITS_ZEROED_WIDTH + EXTENT_BITS_ZEROED_SHIFT)
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#define EXTENT_BITS_STATE_MASK MASK(EXTENT_BITS_STATE_WIDTH, EXTENT_BITS_STATE_SHIFT)
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#define EXTENT_BITS_SZIND_WIDTH LG_CEIL(SC_NSIZES)
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#define EXTENT_BITS_SZIND_SHIFT (EXTENT_BITS_STATE_WIDTH + EXTENT_BITS_STATE_SHIFT)
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#define EXTENT_BITS_SZIND_MASK MASK(EXTENT_BITS_SZIND_WIDTH, EXTENT_BITS_SZIND_SHIFT)
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#define EXTENT_BITS_NFREE_WIDTH (SC_LG_SLAB_MAXREGS + 1)
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#define EXTENT_BITS_NFREE_SHIFT (EXTENT_BITS_SZIND_WIDTH + EXTENT_BITS_SZIND_SHIFT)
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#define EXTENT_BITS_NFREE_MASK MASK(EXTENT_BITS_NFREE_WIDTH, EXTENT_BITS_NFREE_SHIFT)
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#define EXTENT_BITS_BINSHARD_WIDTH 6
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#define EXTENT_BITS_BINSHARD_SHIFT (EXTENT_BITS_NFREE_WIDTH + EXTENT_BITS_NFREE_SHIFT)
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#define EXTENT_BITS_BINSHARD_MASK MASK(EXTENT_BITS_BINSHARD_WIDTH, EXTENT_BITS_BINSHARD_SHIFT)
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#define EXTENT_BITS_IS_HEAD_WIDTH 1
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#define EXTENT_BITS_IS_HEAD_SHIFT (EXTENT_BITS_BINSHARD_WIDTH + EXTENT_BITS_BINSHARD_SHIFT)
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#define EXTENT_BITS_IS_HEAD_MASK MASK(EXTENT_BITS_IS_HEAD_WIDTH, EXTENT_BITS_IS_HEAD_SHIFT)
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#define EXTENT_BITS_SN_SHIFT (EXTENT_BITS_IS_HEAD_WIDTH + EXTENT_BITS_IS_HEAD_SHIFT)
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#define EXTENT_BITS_SN_MASK (UINT64_MAX << EXTENT_BITS_SN_SHIFT)
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/* Pointer to the extent that this structure is responsible for. */
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void *e_addr;
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union {
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/*
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* Extent size and serial number associated with the extent
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* structure (different than the serial number for the extent at
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* e_addr).
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*
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* ssssssss [...] ssssssss ssssnnnn nnnnnnnn
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*/
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size_t e_size_esn;
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#define EXTENT_SIZE_MASK ((size_t)~(PAGE-1))
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#define EXTENT_ESN_MASK ((size_t)PAGE-1)
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/* Base extent size, which may not be a multiple of PAGE. */
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size_t e_bsize;
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};
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/*
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* List linkage, used by a variety of lists:
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* - bin_t's slabs_full
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* - extents_t's LRU
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* - stashed dirty extents
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* - arena's large allocations
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*/
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ql_elm(extent_t) ql_link;
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/*
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* Linkage for per size class sn/address-ordered heaps, and
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* for extent_avail
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*/
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phn(extent_t) ph_link;
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union {
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/* Small region slab metadata. */
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slab_data_t e_slab_data;
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/* Profiling data, used for large objects. */
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struct {
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/* Time when this was allocated. */
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nstime_t e_alloc_time;
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/* Points to a prof_tctx_t. */
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atomic_p_t e_prof_tctx;
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};
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};
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};
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static inline unsigned
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extent_arena_ind_get(const extent_t *extent) {
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unsigned arena_ind = (unsigned)((extent->e_bits &
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EXTENT_BITS_ARENA_MASK) >> EXTENT_BITS_ARENA_SHIFT);
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assert(arena_ind < MALLOCX_ARENA_LIMIT);
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return arena_ind;
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}
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static inline szind_t
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extent_szind_get_maybe_invalid(const extent_t *extent) {
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szind_t szind = (szind_t)((extent->e_bits & EXTENT_BITS_SZIND_MASK) >>
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EXTENT_BITS_SZIND_SHIFT);
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assert(szind <= SC_NSIZES);
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return szind;
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}
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static inline szind_t
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extent_szind_get(const extent_t *extent) {
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szind_t szind = extent_szind_get_maybe_invalid(extent);
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assert(szind < SC_NSIZES); /* Never call when "invalid". */
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return szind;
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}
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static inline size_t
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extent_usize_get(const extent_t *extent) {
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return sz_index2size(extent_szind_get(extent));
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}
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static inline unsigned
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extent_binshard_get(const extent_t *extent) {
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unsigned binshard = (unsigned)((extent->e_bits &
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EXTENT_BITS_BINSHARD_MASK) >> EXTENT_BITS_BINSHARD_SHIFT);
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assert(binshard < bin_infos[extent_szind_get(extent)].n_shards);
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return binshard;
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}
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static inline size_t
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extent_sn_get(const extent_t *extent) {
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return (size_t)((extent->e_bits & EXTENT_BITS_SN_MASK) >>
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EXTENT_BITS_SN_SHIFT);
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}
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static inline extent_state_t
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extent_state_get(const extent_t *extent) {
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return (extent_state_t)((extent->e_bits & EXTENT_BITS_STATE_MASK) >>
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EXTENT_BITS_STATE_SHIFT);
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}
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static inline bool
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extent_zeroed_get(const extent_t *extent) {
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return (bool)((extent->e_bits & EXTENT_BITS_ZEROED_MASK) >>
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EXTENT_BITS_ZEROED_SHIFT);
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}
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static inline bool
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extent_committed_get(const extent_t *extent) {
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return (bool)((extent->e_bits & EXTENT_BITS_COMMITTED_MASK) >>
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EXTENT_BITS_COMMITTED_SHIFT);
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}
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static inline bool
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extent_dumpable_get(const extent_t *extent) {
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return (bool)((extent->e_bits & EXTENT_BITS_DUMPABLE_MASK) >>
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EXTENT_BITS_DUMPABLE_SHIFT);
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}
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static inline bool
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extent_slab_get(const extent_t *extent) {
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return (bool)((extent->e_bits & EXTENT_BITS_SLAB_MASK) >>
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EXTENT_BITS_SLAB_SHIFT);
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}
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static inline unsigned
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extent_nfree_get(const extent_t *extent) {
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assert(extent_slab_get(extent));
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return (unsigned)((extent->e_bits & EXTENT_BITS_NFREE_MASK) >>
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EXTENT_BITS_NFREE_SHIFT);
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}
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static inline void *
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extent_base_get(const extent_t *extent) {
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assert(extent->e_addr == PAGE_ADDR2BASE(extent->e_addr) ||
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!extent_slab_get(extent));
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return PAGE_ADDR2BASE(extent->e_addr);
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}
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static inline void *
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extent_addr_get(const extent_t *extent) {
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assert(extent->e_addr == PAGE_ADDR2BASE(extent->e_addr) ||
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!extent_slab_get(extent));
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return extent->e_addr;
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}
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static inline size_t
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extent_size_get(const extent_t *extent) {
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return (extent->e_size_esn & EXTENT_SIZE_MASK);
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}
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static inline size_t
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extent_esn_get(const extent_t *extent) {
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return (extent->e_size_esn & EXTENT_ESN_MASK);
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}
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static inline size_t
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extent_bsize_get(const extent_t *extent) {
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return extent->e_bsize;
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}
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static inline void *
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extent_before_get(const extent_t *extent) {
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return (void *)((uintptr_t)extent_base_get(extent) - PAGE);
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}
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static inline void *
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extent_last_get(const extent_t *extent) {
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return (void *)((uintptr_t)extent_base_get(extent) +
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extent_size_get(extent) - PAGE);
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}
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static inline void *
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extent_past_get(const extent_t *extent) {
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return (void *)((uintptr_t)extent_base_get(extent) +
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extent_size_get(extent));
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}
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static inline slab_data_t *
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extent_slab_data_get(extent_t *extent) {
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assert(extent_slab_get(extent));
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return &extent->e_slab_data;
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}
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static inline const slab_data_t *
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extent_slab_data_get_const(const extent_t *extent) {
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assert(extent_slab_get(extent));
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return &extent->e_slab_data;
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}
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static inline prof_tctx_t *
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extent_prof_tctx_get(const extent_t *extent) {
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return (prof_tctx_t *)atomic_load_p(&extent->e_prof_tctx,
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ATOMIC_ACQUIRE);
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}
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static inline nstime_t
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extent_prof_alloc_time_get(const extent_t *extent) {
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return extent->e_alloc_time;
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}
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static inline void
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extent_arena_ind_set(extent_t *extent, unsigned arena_ind) {
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extent->e_bits = (extent->e_bits & ~EXTENT_BITS_ARENA_MASK) |
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((uint64_t)arena_ind << EXTENT_BITS_ARENA_SHIFT);
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}
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static inline void
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extent_binshard_set(extent_t *extent, unsigned binshard) {
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/* The assertion assumes szind is set already. */
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assert(binshard < bin_infos[extent_szind_get(extent)].n_shards);
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extent->e_bits = (extent->e_bits & ~EXTENT_BITS_BINSHARD_MASK) |
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((uint64_t)binshard << EXTENT_BITS_BINSHARD_SHIFT);
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}
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static inline void
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extent_addr_set(extent_t *extent, void *addr) {
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extent->e_addr = addr;
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}
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static inline void
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extent_size_set(extent_t *extent, size_t size) {
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assert((size & ~EXTENT_SIZE_MASK) == 0);
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extent->e_size_esn = size | (extent->e_size_esn & ~EXTENT_SIZE_MASK);
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}
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static inline void
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extent_esn_set(extent_t *extent, size_t esn) {
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extent->e_size_esn = (extent->e_size_esn & ~EXTENT_ESN_MASK) | (esn &
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EXTENT_ESN_MASK);
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}
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static inline void
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extent_bsize_set(extent_t *extent, size_t bsize) {
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extent->e_bsize = bsize;
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}
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static inline void
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extent_szind_set(extent_t *extent, szind_t szind) {
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assert(szind <= SC_NSIZES); /* SC_NSIZES means "invalid". */
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extent->e_bits = (extent->e_bits & ~EXTENT_BITS_SZIND_MASK) |
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((uint64_t)szind << EXTENT_BITS_SZIND_SHIFT);
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}
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static inline void
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extent_nfree_set(extent_t *extent, unsigned nfree) {
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assert(extent_slab_get(extent));
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extent->e_bits = (extent->e_bits & ~EXTENT_BITS_NFREE_MASK) |
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((uint64_t)nfree << EXTENT_BITS_NFREE_SHIFT);
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}
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static inline void
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extent_nfree_binshard_set(extent_t *extent, unsigned nfree, unsigned binshard) {
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/* The assertion assumes szind is set already. */
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assert(binshard < bin_infos[extent_szind_get(extent)].n_shards);
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extent->e_bits = (extent->e_bits &
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(~EXTENT_BITS_NFREE_MASK & ~EXTENT_BITS_BINSHARD_MASK)) |
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((uint64_t)binshard << EXTENT_BITS_BINSHARD_SHIFT) |
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((uint64_t)nfree << EXTENT_BITS_NFREE_SHIFT);
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}
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static inline void
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extent_nfree_inc(extent_t *extent) {
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assert(extent_slab_get(extent));
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extent->e_bits += ((uint64_t)1U << EXTENT_BITS_NFREE_SHIFT);
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}
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static inline void
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extent_nfree_dec(extent_t *extent) {
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assert(extent_slab_get(extent));
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extent->e_bits -= ((uint64_t)1U << EXTENT_BITS_NFREE_SHIFT);
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}
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static inline void
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extent_nfree_sub(extent_t *extent, uint64_t n) {
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assert(extent_slab_get(extent));
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extent->e_bits -= (n << EXTENT_BITS_NFREE_SHIFT);
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}
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static inline void
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extent_sn_set(extent_t *extent, size_t sn) {
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extent->e_bits = (extent->e_bits & ~EXTENT_BITS_SN_MASK) |
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((uint64_t)sn << EXTENT_BITS_SN_SHIFT);
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}
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static inline void
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extent_state_set(extent_t *extent, extent_state_t state) {
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extent->e_bits = (extent->e_bits & ~EXTENT_BITS_STATE_MASK) |
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((uint64_t)state << EXTENT_BITS_STATE_SHIFT);
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}
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static inline void
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extent_zeroed_set(extent_t *extent, bool zeroed) {
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extent->e_bits = (extent->e_bits & ~EXTENT_BITS_ZEROED_MASK) |
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((uint64_t)zeroed << EXTENT_BITS_ZEROED_SHIFT);
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}
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static inline void
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extent_committed_set(extent_t *extent, bool committed) {
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extent->e_bits = (extent->e_bits & ~EXTENT_BITS_COMMITTED_MASK) |
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((uint64_t)committed << EXTENT_BITS_COMMITTED_SHIFT);
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}
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static inline void
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extent_dumpable_set(extent_t *extent, bool dumpable) {
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extent->e_bits = (extent->e_bits & ~EXTENT_BITS_DUMPABLE_MASK) |
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((uint64_t)dumpable << EXTENT_BITS_DUMPABLE_SHIFT);
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}
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static inline void
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extent_slab_set(extent_t *extent, bool slab) {
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extent->e_bits = (extent->e_bits & ~EXTENT_BITS_SLAB_MASK) |
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((uint64_t)slab << EXTENT_BITS_SLAB_SHIFT);
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}
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static inline void
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extent_prof_tctx_set(extent_t *extent, prof_tctx_t *tctx) {
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atomic_store_p(&extent->e_prof_tctx, tctx, ATOMIC_RELEASE);
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}
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static inline void
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extent_prof_alloc_time_set(extent_t *extent, nstime_t t) {
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nstime_copy(&extent->e_alloc_time, &t);
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}
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static inline bool
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extent_is_head_get(extent_t *extent) {
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if (maps_coalesce) {
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not_reached();
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}
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return (bool)((extent->e_bits & EXTENT_BITS_IS_HEAD_MASK) >>
|
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EXTENT_BITS_IS_HEAD_SHIFT);
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}
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static inline void
|
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extent_is_head_set(extent_t *extent, bool is_head) {
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if (maps_coalesce) {
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|
not_reached();
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|
}
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|
|
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extent->e_bits = (extent->e_bits & ~EXTENT_BITS_IS_HEAD_MASK) |
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((uint64_t)is_head << EXTENT_BITS_IS_HEAD_SHIFT);
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}
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static inline void
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extent_init(extent_t *extent, unsigned arena_ind, void *addr, size_t size,
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bool slab, szind_t szind, size_t sn, extent_state_t state, bool zeroed,
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bool committed, bool dumpable, extent_head_state_t is_head) {
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assert(addr == PAGE_ADDR2BASE(addr) || !slab);
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|
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extent_arena_ind_set(extent, arena_ind);
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extent_addr_set(extent, addr);
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extent_size_set(extent, size);
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extent_slab_set(extent, slab);
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extent_szind_set(extent, szind);
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extent_sn_set(extent, sn);
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extent_state_set(extent, state);
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extent_zeroed_set(extent, zeroed);
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extent_committed_set(extent, committed);
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extent_dumpable_set(extent, dumpable);
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ql_elm_new(extent, ql_link);
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|
if (!maps_coalesce) {
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extent_is_head_set(extent, (is_head == EXTENT_IS_HEAD) ? true :
|
|
false);
|
|
}
|
|
if (config_prof) {
|
|
extent_prof_tctx_set(extent, NULL);
|
|
}
|
|
}
|
|
|
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static inline void
|
|
extent_binit(extent_t *extent, void *addr, size_t bsize, size_t sn) {
|
|
extent_arena_ind_set(extent, (1U << MALLOCX_ARENA_BITS) - 1);
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|
extent_addr_set(extent, addr);
|
|
extent_bsize_set(extent, bsize);
|
|
extent_slab_set(extent, false);
|
|
extent_szind_set(extent, SC_NSIZES);
|
|
extent_sn_set(extent, sn);
|
|
extent_state_set(extent, extent_state_active);
|
|
extent_zeroed_set(extent, true);
|
|
extent_committed_set(extent, true);
|
|
extent_dumpable_set(extent, true);
|
|
}
|
|
|
|
static inline void
|
|
extent_list_init(extent_list_t *list) {
|
|
ql_new(list);
|
|
}
|
|
|
|
static inline extent_t *
|
|
extent_list_first(const extent_list_t *list) {
|
|
return ql_first(list);
|
|
}
|
|
|
|
static inline extent_t *
|
|
extent_list_last(const extent_list_t *list) {
|
|
return ql_last(list, ql_link);
|
|
}
|
|
|
|
static inline void
|
|
extent_list_append(extent_list_t *list, extent_t *extent) {
|
|
ql_tail_insert(list, extent, ql_link);
|
|
}
|
|
|
|
static inline void
|
|
extent_list_prepend(extent_list_t *list, extent_t *extent) {
|
|
ql_head_insert(list, extent, ql_link);
|
|
}
|
|
|
|
static inline void
|
|
extent_list_replace(extent_list_t *list, extent_t *to_remove,
|
|
extent_t *to_insert) {
|
|
ql_after_insert(to_remove, to_insert, ql_link);
|
|
ql_remove(list, to_remove, ql_link);
|
|
}
|
|
|
|
static inline void
|
|
extent_list_remove(extent_list_t *list, extent_t *extent) {
|
|
ql_remove(list, extent, ql_link);
|
|
}
|
|
|
|
static inline int
|
|
extent_sn_comp(const extent_t *a, const extent_t *b) {
|
|
size_t a_sn = extent_sn_get(a);
|
|
size_t b_sn = extent_sn_get(b);
|
|
|
|
return (a_sn > b_sn) - (a_sn < b_sn);
|
|
}
|
|
|
|
static inline int
|
|
extent_esn_comp(const extent_t *a, const extent_t *b) {
|
|
size_t a_esn = extent_esn_get(a);
|
|
size_t b_esn = extent_esn_get(b);
|
|
|
|
return (a_esn > b_esn) - (a_esn < b_esn);
|
|
}
|
|
|
|
static inline int
|
|
extent_ad_comp(const extent_t *a, const extent_t *b) {
|
|
uintptr_t a_addr = (uintptr_t)extent_addr_get(a);
|
|
uintptr_t b_addr = (uintptr_t)extent_addr_get(b);
|
|
|
|
return (a_addr > b_addr) - (a_addr < b_addr);
|
|
}
|
|
|
|
static inline int
|
|
extent_ead_comp(const extent_t *a, const extent_t *b) {
|
|
uintptr_t a_eaddr = (uintptr_t)a;
|
|
uintptr_t b_eaddr = (uintptr_t)b;
|
|
|
|
return (a_eaddr > b_eaddr) - (a_eaddr < b_eaddr);
|
|
}
|
|
|
|
static inline int
|
|
extent_snad_comp(const extent_t *a, const extent_t *b) {
|
|
int ret;
|
|
|
|
ret = extent_sn_comp(a, b);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
|
|
ret = extent_ad_comp(a, b);
|
|
return ret;
|
|
}
|
|
|
|
static inline int
|
|
extent_esnead_comp(const extent_t *a, const extent_t *b) {
|
|
int ret;
|
|
|
|
ret = extent_esn_comp(a, b);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
|
|
ret = extent_ead_comp(a, b);
|
|
return ret;
|
|
}
|
|
|
|
#endif /* JEMALLOC_INTERNAL_EXTENT_H */
|