529 lines
17 KiB
C
529 lines
17 KiB
C
#ifndef JEMALLOC_INTERNAL_RTREE_H
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#define JEMALLOC_INTERNAL_RTREE_H
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#include "jemalloc/internal/atomic.h"
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#include "jemalloc/internal/mutex.h"
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#include "jemalloc/internal/rtree_tsd.h"
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#include "jemalloc/internal/sc.h"
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#include "jemalloc/internal/tsd.h"
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/*
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* This radix tree implementation is tailored to the singular purpose of
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* associating metadata with extents that are currently owned by jemalloc.
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*
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*******************************************************************************
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*/
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/* Number of high insignificant bits. */
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#define RTREE_NHIB ((1U << (LG_SIZEOF_PTR+3)) - LG_VADDR)
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/* Number of low insigificant bits. */
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#define RTREE_NLIB LG_PAGE
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/* Number of significant bits. */
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#define RTREE_NSB (LG_VADDR - RTREE_NLIB)
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/* Number of levels in radix tree. */
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#if RTREE_NSB <= 10
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# define RTREE_HEIGHT 1
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#elif RTREE_NSB <= 36
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# define RTREE_HEIGHT 2
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#elif RTREE_NSB <= 52
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# define RTREE_HEIGHT 3
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#else
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# error Unsupported number of significant virtual address bits
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#endif
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/* Use compact leaf representation if virtual address encoding allows. */
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#if RTREE_NHIB >= LG_CEIL(SC_NSIZES)
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# define RTREE_LEAF_COMPACT
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#endif
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/* Needed for initialization only. */
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#define RTREE_LEAFKEY_INVALID ((uintptr_t)1)
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typedef struct rtree_node_elm_s rtree_node_elm_t;
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struct rtree_node_elm_s {
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atomic_p_t child; /* (rtree_{node,leaf}_elm_t *) */
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};
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struct rtree_leaf_elm_s {
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#ifdef RTREE_LEAF_COMPACT
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/*
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* Single pointer-width field containing all three leaf element fields.
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* For example, on a 64-bit x64 system with 48 significant virtual
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* memory address bits, the index, edata, and slab fields are packed as
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* such:
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*
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* x: index
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* e: edata
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* b: slab
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*
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* 00000000 xxxxxxxx eeeeeeee [...] eeeeeeee eeee000b
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*/
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atomic_p_t le_bits;
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#else
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atomic_p_t le_edata; /* (edata_t *) */
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atomic_u_t le_szind; /* (szind_t) */
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atomic_b_t le_slab; /* (bool) */
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#endif
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};
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typedef struct rtree_level_s rtree_level_t;
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struct rtree_level_s {
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/* Number of key bits distinguished by this level. */
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unsigned bits;
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/*
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* Cumulative number of key bits distinguished by traversing to
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* corresponding tree level.
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*/
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unsigned cumbits;
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};
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typedef struct rtree_s rtree_t;
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struct rtree_s {
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malloc_mutex_t init_lock;
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/* Number of elements based on rtree_levels[0].bits. */
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#if RTREE_HEIGHT > 1
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rtree_node_elm_t root[1U << (RTREE_NSB/RTREE_HEIGHT)];
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#else
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rtree_leaf_elm_t root[1U << (RTREE_NSB/RTREE_HEIGHT)];
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#endif
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};
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/*
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* Split the bits into one to three partitions depending on number of
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* significant bits. It the number of bits does not divide evenly into the
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* number of levels, place one remainder bit per level starting at the leaf
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* level.
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*/
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static const rtree_level_t rtree_levels[] = {
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#if RTREE_HEIGHT == 1
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{RTREE_NSB, RTREE_NHIB + RTREE_NSB}
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#elif RTREE_HEIGHT == 2
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{RTREE_NSB/2, RTREE_NHIB + RTREE_NSB/2},
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{RTREE_NSB/2 + RTREE_NSB%2, RTREE_NHIB + RTREE_NSB}
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#elif RTREE_HEIGHT == 3
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{RTREE_NSB/3, RTREE_NHIB + RTREE_NSB/3},
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{RTREE_NSB/3 + RTREE_NSB%3/2,
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RTREE_NHIB + RTREE_NSB/3*2 + RTREE_NSB%3/2},
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{RTREE_NSB/3 + RTREE_NSB%3 - RTREE_NSB%3/2, RTREE_NHIB + RTREE_NSB}
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#else
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# error Unsupported rtree height
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#endif
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};
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bool rtree_new(rtree_t *rtree, bool zeroed);
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typedef rtree_node_elm_t *(rtree_node_alloc_t)(tsdn_t *, rtree_t *, size_t);
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extern rtree_node_alloc_t *JET_MUTABLE rtree_node_alloc;
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typedef rtree_leaf_elm_t *(rtree_leaf_alloc_t)(tsdn_t *, rtree_t *, size_t);
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extern rtree_leaf_alloc_t *JET_MUTABLE rtree_leaf_alloc;
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typedef void (rtree_node_dalloc_t)(tsdn_t *, rtree_t *, rtree_node_elm_t *);
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extern rtree_node_dalloc_t *JET_MUTABLE rtree_node_dalloc;
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typedef void (rtree_leaf_dalloc_t)(tsdn_t *, rtree_t *, rtree_leaf_elm_t *);
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extern rtree_leaf_dalloc_t *JET_MUTABLE rtree_leaf_dalloc;
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#ifdef JEMALLOC_JET
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void rtree_delete(tsdn_t *tsdn, rtree_t *rtree);
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#endif
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rtree_leaf_elm_t *rtree_leaf_elm_lookup_hard(tsdn_t *tsdn, rtree_t *rtree,
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rtree_ctx_t *rtree_ctx, uintptr_t key, bool dependent, bool init_missing);
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JEMALLOC_ALWAYS_INLINE uintptr_t
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rtree_leafkey(uintptr_t key) {
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unsigned ptrbits = ZU(1) << (LG_SIZEOF_PTR+3);
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unsigned cumbits = (rtree_levels[RTREE_HEIGHT-1].cumbits -
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rtree_levels[RTREE_HEIGHT-1].bits);
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unsigned maskbits = ptrbits - cumbits;
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uintptr_t mask = ~((ZU(1) << maskbits) - 1);
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return (key & mask);
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}
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JEMALLOC_ALWAYS_INLINE size_t
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rtree_cache_direct_map(uintptr_t key) {
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unsigned ptrbits = ZU(1) << (LG_SIZEOF_PTR+3);
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unsigned cumbits = (rtree_levels[RTREE_HEIGHT-1].cumbits -
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rtree_levels[RTREE_HEIGHT-1].bits);
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unsigned maskbits = ptrbits - cumbits;
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return (size_t)((key >> maskbits) & (RTREE_CTX_NCACHE - 1));
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}
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JEMALLOC_ALWAYS_INLINE uintptr_t
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rtree_subkey(uintptr_t key, unsigned level) {
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unsigned ptrbits = ZU(1) << (LG_SIZEOF_PTR+3);
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unsigned cumbits = rtree_levels[level].cumbits;
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unsigned shiftbits = ptrbits - cumbits;
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unsigned maskbits = rtree_levels[level].bits;
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uintptr_t mask = (ZU(1) << maskbits) - 1;
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return ((key >> shiftbits) & mask);
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}
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/*
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* Atomic getters.
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*
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* dependent: Reading a value on behalf of a pointer to a valid allocation
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* is guaranteed to be a clean read even without synchronization,
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* because the rtree update became visible in memory before the
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* pointer came into existence.
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* !dependent: An arbitrary read, e.g. on behalf of ivsalloc(), may not be
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* dependent on a previous rtree write, which means a stale read
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* could result if synchronization were omitted here.
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*/
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# ifdef RTREE_LEAF_COMPACT
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JEMALLOC_ALWAYS_INLINE uintptr_t
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rtree_leaf_elm_bits_read(tsdn_t *tsdn, rtree_t *rtree,
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rtree_leaf_elm_t *elm, bool dependent) {
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return (uintptr_t)atomic_load_p(&elm->le_bits, dependent
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? ATOMIC_RELAXED : ATOMIC_ACQUIRE);
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}
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JEMALLOC_ALWAYS_INLINE edata_t *
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rtree_leaf_elm_bits_edata_get(uintptr_t bits) {
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# ifdef __aarch64__
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/*
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* aarch64 doesn't sign extend the highest virtual address bit to set
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* the higher ones. Instead, the high bits gets zeroed.
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*/
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uintptr_t high_bit_mask = ((uintptr_t)1 << LG_VADDR) - 1;
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/* Mask off the slab bit. */
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uintptr_t low_bit_mask = ~(uintptr_t)1;
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uintptr_t mask = high_bit_mask & low_bit_mask;
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return (edata_t *)(bits & mask);
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# else
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/* Restore sign-extended high bits, mask slab bit. */
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return (edata_t *)((uintptr_t)((intptr_t)(bits << RTREE_NHIB) >>
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RTREE_NHIB) & ~((uintptr_t)0x1));
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# endif
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}
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JEMALLOC_ALWAYS_INLINE szind_t
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rtree_leaf_elm_bits_szind_get(uintptr_t bits) {
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return (szind_t)(bits >> LG_VADDR);
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}
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JEMALLOC_ALWAYS_INLINE bool
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rtree_leaf_elm_bits_slab_get(uintptr_t bits) {
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return (bool)(bits & (uintptr_t)0x1);
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}
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# endif
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JEMALLOC_ALWAYS_INLINE edata_t *
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rtree_leaf_elm_edata_read(tsdn_t *tsdn, rtree_t *rtree,
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rtree_leaf_elm_t *elm, bool dependent) {
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#ifdef RTREE_LEAF_COMPACT
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uintptr_t bits = rtree_leaf_elm_bits_read(tsdn, rtree, elm, dependent);
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return rtree_leaf_elm_bits_edata_get(bits);
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#else
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edata_t *edata = (edata_t *)atomic_load_p(&elm->le_edata, dependent
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? ATOMIC_RELAXED : ATOMIC_ACQUIRE);
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return edata;
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#endif
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}
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JEMALLOC_ALWAYS_INLINE szind_t
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rtree_leaf_elm_szind_read(tsdn_t *tsdn, rtree_t *rtree,
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rtree_leaf_elm_t *elm, bool dependent) {
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#ifdef RTREE_LEAF_COMPACT
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uintptr_t bits = rtree_leaf_elm_bits_read(tsdn, rtree, elm, dependent);
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return rtree_leaf_elm_bits_szind_get(bits);
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#else
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return (szind_t)atomic_load_u(&elm->le_szind, dependent ? ATOMIC_RELAXED
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: ATOMIC_ACQUIRE);
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#endif
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}
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JEMALLOC_ALWAYS_INLINE bool
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rtree_leaf_elm_slab_read(tsdn_t *tsdn, rtree_t *rtree,
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rtree_leaf_elm_t *elm, bool dependent) {
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#ifdef RTREE_LEAF_COMPACT
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uintptr_t bits = rtree_leaf_elm_bits_read(tsdn, rtree, elm, dependent);
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return rtree_leaf_elm_bits_slab_get(bits);
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#else
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return atomic_load_b(&elm->le_slab, dependent ? ATOMIC_RELAXED :
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ATOMIC_ACQUIRE);
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#endif
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}
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static inline void
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rtree_leaf_elm_edata_write(tsdn_t *tsdn, rtree_t *rtree,
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rtree_leaf_elm_t *elm, edata_t *edata) {
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#ifdef RTREE_LEAF_COMPACT
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uintptr_t old_bits = rtree_leaf_elm_bits_read(tsdn, rtree, elm, true);
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uintptr_t bits = ((uintptr_t)rtree_leaf_elm_bits_szind_get(old_bits) <<
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LG_VADDR) | ((uintptr_t)edata & (((uintptr_t)0x1 << LG_VADDR) - 1))
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| ((uintptr_t)rtree_leaf_elm_bits_slab_get(old_bits));
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atomic_store_p(&elm->le_bits, (void *)bits, ATOMIC_RELEASE);
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#else
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atomic_store_p(&elm->le_edata, edata, ATOMIC_RELEASE);
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#endif
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}
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static inline void
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rtree_leaf_elm_szind_write(tsdn_t *tsdn, rtree_t *rtree,
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rtree_leaf_elm_t *elm, szind_t szind) {
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assert(szind <= SC_NSIZES);
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#ifdef RTREE_LEAF_COMPACT
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uintptr_t old_bits = rtree_leaf_elm_bits_read(tsdn, rtree, elm,
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true);
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uintptr_t bits = ((uintptr_t)szind << LG_VADDR) |
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((uintptr_t)rtree_leaf_elm_bits_edata_get(old_bits) &
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(((uintptr_t)0x1 << LG_VADDR) - 1)) |
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((uintptr_t)rtree_leaf_elm_bits_slab_get(old_bits));
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atomic_store_p(&elm->le_bits, (void *)bits, ATOMIC_RELEASE);
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#else
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atomic_store_u(&elm->le_szind, szind, ATOMIC_RELEASE);
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#endif
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}
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static inline void
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rtree_leaf_elm_slab_write(tsdn_t *tsdn, rtree_t *rtree,
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rtree_leaf_elm_t *elm, bool slab) {
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#ifdef RTREE_LEAF_COMPACT
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uintptr_t old_bits = rtree_leaf_elm_bits_read(tsdn, rtree, elm,
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true);
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uintptr_t bits = ((uintptr_t)rtree_leaf_elm_bits_szind_get(old_bits) <<
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LG_VADDR) | ((uintptr_t)rtree_leaf_elm_bits_edata_get(old_bits) &
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(((uintptr_t)0x1 << LG_VADDR) - 1)) | ((uintptr_t)slab);
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atomic_store_p(&elm->le_bits, (void *)bits, ATOMIC_RELEASE);
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#else
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atomic_store_b(&elm->le_slab, slab, ATOMIC_RELEASE);
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#endif
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}
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static inline void
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rtree_leaf_elm_write(tsdn_t *tsdn, rtree_t *rtree,
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rtree_leaf_elm_t *elm, edata_t *edata, szind_t szind, bool slab) {
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#ifdef RTREE_LEAF_COMPACT
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uintptr_t bits = ((uintptr_t)szind << LG_VADDR) |
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((uintptr_t)edata & (((uintptr_t)0x1 << LG_VADDR) - 1)) |
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((uintptr_t)slab);
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atomic_store_p(&elm->le_bits, (void *)bits, ATOMIC_RELEASE);
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#else
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rtree_leaf_elm_slab_write(tsdn, rtree, elm, slab);
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rtree_leaf_elm_szind_write(tsdn, rtree, elm, szind);
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/*
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* Write edata last, since the element is atomically considered valid
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* as soon as the edata field is non-NULL.
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*/
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rtree_leaf_elm_edata_write(tsdn, rtree, elm, edata);
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#endif
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}
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static inline void
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rtree_leaf_elm_szind_slab_update(tsdn_t *tsdn, rtree_t *rtree,
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rtree_leaf_elm_t *elm, szind_t szind, bool slab) {
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assert(!slab || szind < SC_NBINS);
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/*
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* The caller implicitly assures that it is the only writer to the szind
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* and slab fields, and that the edata field cannot currently change.
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*/
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rtree_leaf_elm_slab_write(tsdn, rtree, elm, slab);
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rtree_leaf_elm_szind_write(tsdn, rtree, elm, szind);
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}
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JEMALLOC_ALWAYS_INLINE rtree_leaf_elm_t *
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rtree_leaf_elm_lookup(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx,
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uintptr_t key, bool dependent, bool init_missing) {
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assert(key != 0);
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assert(!dependent || !init_missing);
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size_t slot = rtree_cache_direct_map(key);
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uintptr_t leafkey = rtree_leafkey(key);
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assert(leafkey != RTREE_LEAFKEY_INVALID);
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/* Fast path: L1 direct mapped cache. */
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if (likely(rtree_ctx->cache[slot].leafkey == leafkey)) {
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rtree_leaf_elm_t *leaf = rtree_ctx->cache[slot].leaf;
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assert(leaf != NULL);
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uintptr_t subkey = rtree_subkey(key, RTREE_HEIGHT-1);
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return &leaf[subkey];
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}
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/*
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* Search the L2 LRU cache. On hit, swap the matching element into the
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* slot in L1 cache, and move the position in L2 up by 1.
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*/
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#define RTREE_CACHE_CHECK_L2(i) do { \
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if (likely(rtree_ctx->l2_cache[i].leafkey == leafkey)) { \
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rtree_leaf_elm_t *leaf = rtree_ctx->l2_cache[i].leaf; \
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assert(leaf != NULL); \
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if (i > 0) { \
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/* Bubble up by one. */ \
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rtree_ctx->l2_cache[i].leafkey = \
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rtree_ctx->l2_cache[i - 1].leafkey; \
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rtree_ctx->l2_cache[i].leaf = \
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rtree_ctx->l2_cache[i - 1].leaf; \
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rtree_ctx->l2_cache[i - 1].leafkey = \
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rtree_ctx->cache[slot].leafkey; \
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rtree_ctx->l2_cache[i - 1].leaf = \
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rtree_ctx->cache[slot].leaf; \
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} else { \
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rtree_ctx->l2_cache[0].leafkey = \
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rtree_ctx->cache[slot].leafkey; \
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rtree_ctx->l2_cache[0].leaf = \
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rtree_ctx->cache[slot].leaf; \
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} \
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rtree_ctx->cache[slot].leafkey = leafkey; \
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rtree_ctx->cache[slot].leaf = leaf; \
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uintptr_t subkey = rtree_subkey(key, RTREE_HEIGHT-1); \
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return &leaf[subkey]; \
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} \
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} while (0)
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/* Check the first cache entry. */
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RTREE_CACHE_CHECK_L2(0);
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/* Search the remaining cache elements. */
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for (unsigned i = 1; i < RTREE_CTX_NCACHE_L2; i++) {
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RTREE_CACHE_CHECK_L2(i);
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}
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#undef RTREE_CACHE_CHECK_L2
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return rtree_leaf_elm_lookup_hard(tsdn, rtree, rtree_ctx, key,
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dependent, init_missing);
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}
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static inline bool
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rtree_write(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx, uintptr_t key,
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edata_t *edata, szind_t szind, bool slab) {
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/* Use rtree_clear() to set the edata to NULL. */
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assert(edata != NULL);
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rtree_leaf_elm_t *elm = rtree_leaf_elm_lookup(tsdn, rtree, rtree_ctx,
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key, false, true);
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if (elm == NULL) {
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return true;
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}
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assert(rtree_leaf_elm_edata_read(tsdn, rtree, elm, false) == NULL);
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rtree_leaf_elm_write(tsdn, rtree, elm, edata, szind, slab);
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return false;
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}
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JEMALLOC_ALWAYS_INLINE rtree_leaf_elm_t *
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rtree_read(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx, uintptr_t key,
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bool dependent) {
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rtree_leaf_elm_t *elm = rtree_leaf_elm_lookup(tsdn, rtree, rtree_ctx,
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key, dependent, false);
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if (!dependent && elm == NULL) {
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return NULL;
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}
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assert(elm != NULL);
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return elm;
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}
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JEMALLOC_ALWAYS_INLINE edata_t *
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rtree_edata_read(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx,
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uintptr_t key, bool dependent) {
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rtree_leaf_elm_t *elm = rtree_read(tsdn, rtree, rtree_ctx, key,
|
|
dependent);
|
|
if (!dependent && elm == NULL) {
|
|
return NULL;
|
|
}
|
|
return rtree_leaf_elm_edata_read(tsdn, rtree, elm, dependent);
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE szind_t
|
|
rtree_szind_read(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx,
|
|
uintptr_t key, bool dependent) {
|
|
rtree_leaf_elm_t *elm = rtree_read(tsdn, rtree, rtree_ctx, key,
|
|
dependent);
|
|
if (!dependent && elm == NULL) {
|
|
return SC_NSIZES;
|
|
}
|
|
return rtree_leaf_elm_szind_read(tsdn, rtree, elm, dependent);
|
|
}
|
|
|
|
/*
|
|
* rtree_slab_read() is intentionally omitted because slab is always read in
|
|
* conjunction with szind, which makes rtree_szind_slab_read() a better choice.
|
|
*/
|
|
|
|
JEMALLOC_ALWAYS_INLINE bool
|
|
rtree_edata_szind_read(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx,
|
|
uintptr_t key, bool dependent, edata_t **r_edata, szind_t *r_szind) {
|
|
rtree_leaf_elm_t *elm = rtree_read(tsdn, rtree, rtree_ctx, key,
|
|
dependent);
|
|
if (!dependent && elm == NULL) {
|
|
return true;
|
|
}
|
|
*r_edata = rtree_leaf_elm_edata_read(tsdn, rtree, elm, dependent);
|
|
*r_szind = rtree_leaf_elm_szind_read(tsdn, rtree, elm, dependent);
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Try to read szind_slab from the L1 cache. Returns true on a hit,
|
|
* and fills in r_szind and r_slab. Otherwise returns false.
|
|
*
|
|
* Key is allowed to be NULL in order to save an extra branch on the
|
|
* fastpath. returns false in this case.
|
|
*/
|
|
JEMALLOC_ALWAYS_INLINE bool
|
|
rtree_szind_slab_read_fast(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx,
|
|
uintptr_t key, szind_t *r_szind, bool *r_slab) {
|
|
rtree_leaf_elm_t *elm;
|
|
|
|
size_t slot = rtree_cache_direct_map(key);
|
|
uintptr_t leafkey = rtree_leafkey(key);
|
|
assert(leafkey != RTREE_LEAFKEY_INVALID);
|
|
|
|
if (likely(rtree_ctx->cache[slot].leafkey == leafkey)) {
|
|
rtree_leaf_elm_t *leaf = rtree_ctx->cache[slot].leaf;
|
|
assert(leaf != NULL);
|
|
uintptr_t subkey = rtree_subkey(key, RTREE_HEIGHT-1);
|
|
elm = &leaf[subkey];
|
|
|
|
#ifdef RTREE_LEAF_COMPACT
|
|
uintptr_t bits = rtree_leaf_elm_bits_read(tsdn, rtree,
|
|
elm, true);
|
|
*r_szind = rtree_leaf_elm_bits_szind_get(bits);
|
|
*r_slab = rtree_leaf_elm_bits_slab_get(bits);
|
|
#else
|
|
*r_szind = rtree_leaf_elm_szind_read(tsdn, rtree, elm, true);
|
|
*r_slab = rtree_leaf_elm_slab_read(tsdn, rtree, elm, true);
|
|
#endif
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
JEMALLOC_ALWAYS_INLINE bool
|
|
rtree_szind_slab_read(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx,
|
|
uintptr_t key, bool dependent, szind_t *r_szind, bool *r_slab) {
|
|
rtree_leaf_elm_t *elm = rtree_read(tsdn, rtree, rtree_ctx, key,
|
|
dependent);
|
|
if (!dependent && elm == NULL) {
|
|
return true;
|
|
}
|
|
#ifdef RTREE_LEAF_COMPACT
|
|
uintptr_t bits = rtree_leaf_elm_bits_read(tsdn, rtree, elm, dependent);
|
|
*r_szind = rtree_leaf_elm_bits_szind_get(bits);
|
|
*r_slab = rtree_leaf_elm_bits_slab_get(bits);
|
|
#else
|
|
*r_szind = rtree_leaf_elm_szind_read(tsdn, rtree, elm, dependent);
|
|
*r_slab = rtree_leaf_elm_slab_read(tsdn, rtree, elm, dependent);
|
|
#endif
|
|
return false;
|
|
}
|
|
|
|
static inline void
|
|
rtree_szind_slab_update(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx,
|
|
uintptr_t key, szind_t szind, bool slab) {
|
|
assert(!slab || szind < SC_NBINS);
|
|
|
|
rtree_leaf_elm_t *elm = rtree_read(tsdn, rtree, rtree_ctx, key, true);
|
|
rtree_leaf_elm_szind_slab_update(tsdn, rtree, elm, szind, slab);
|
|
}
|
|
|
|
static inline void
|
|
rtree_clear(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx,
|
|
uintptr_t key) {
|
|
rtree_leaf_elm_t *elm = rtree_read(tsdn, rtree, rtree_ctx, key, true);
|
|
assert(rtree_leaf_elm_edata_read(tsdn, rtree, elm, false) !=
|
|
NULL);
|
|
rtree_leaf_elm_write(tsdn, rtree, elm, NULL, SC_NSIZES, false);
|
|
}
|
|
|
|
#endif /* JEMALLOC_INTERNAL_RTREE_H */
|