Rtree: Pull leaf contents into their own struct.
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faec7219b2
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bd4fdf295e
@ -39,6 +39,23 @@ struct e_prof_info_s {
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};
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typedef struct e_prof_info_s e_prof_info_t;
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/*
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* The information about a particular edata that lives in an emap. Space is
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* more previous there (the information, plus the edata pointer, has to live in
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* a 64-bit word if we want to enable a packed representation.
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*
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* There are two things that are special about the information here:
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* - It's quicker to access. You have one fewer pointer hop, since finding the
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* edata_t associated with an item always requires accessing the rtree leaf in
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* which this data is stored.
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* - It can be read unsynchronized, and without worrying about lifetime issues.
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*/
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typedef struct edata_map_info_s edata_map_info_t;
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struct edata_map_info_s {
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bool slab;
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szind_t szind;
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};
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/* Extent (span of pages). Use accessor functions for e_* fields. */
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typedef struct edata_s edata_t;
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typedef ql_head(edata_t) edata_list_t;
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@ -43,6 +43,13 @@ 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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typedef struct rtree_leaf_elm_contents_s rtree_leaf_elm_contents_t;
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struct rtree_leaf_elm_contents_s {
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edata_t *edata;
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szind_t szind;
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bool slab;
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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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@ -163,43 +170,53 @@ rtree_leaf_elm_bits_read(tsdn_t *tsdn, rtree_t *rtree,
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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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JEMALLOC_ALWAYS_INLINE uintptr_t
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rtree_leaf_elm_bits_encode(rtree_leaf_elm_contents_t contents) {
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uintptr_t edata_bits = (uintptr_t)contents.edata
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& (((uintptr_t)1 << LG_VADDR) - 1);
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uintptr_t szind_bits = (uintptr_t)contents.szind << LG_VADDR;
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/*
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* Slab shares the low bit of edata; we know edata is on an even address
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* (in fact, it's 128 bytes on 64-bit systems; we can enforce this
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* alignment if we want to steal 6 extra rtree leaf bits someday.
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*/
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uintptr_t slab_bits = (uintptr_t)contents.slab;
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return szind_bits | edata_bits | slab_bits;
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}
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JEMALLOC_ALWAYS_INLINE rtree_leaf_elm_contents_t
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rtree_leaf_elm_bits_decode(uintptr_t bits) {
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rtree_leaf_elm_contents_t contents;
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/* Do the easy things first. */
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contents.szind = bits >> LG_VADDR;
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contents.slab = (bool)(bits & 1);
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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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* the higher ones. Instead, the high bits get 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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contents.edata = (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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contents.edata = (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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return contents;
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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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# endif /* RTREE_LEAF_COMPACT */
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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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rtree_leaf_elm_contents_t contents = rtree_leaf_elm_bits_decode(bits);
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return contents.edata;
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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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@ -212,7 +229,8 @@ 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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rtree_leaf_elm_contents_t contents = rtree_leaf_elm_bits_decode(bits);
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return contents.szind;
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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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@ -224,7 +242,8 @@ 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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rtree_leaf_elm_contents_t contents = rtree_leaf_elm_bits_decode(bits);
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return contents.slab;
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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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@ -236,9 +255,10 @@ 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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rtree_leaf_elm_contents_t contents = rtree_leaf_elm_bits_decode(
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old_bits);
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contents.edata = edata;
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uintptr_t bits = rtree_leaf_elm_bits_encode(contents);
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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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@ -253,10 +273,10 @@ rtree_leaf_elm_szind_write(tsdn_t *tsdn, rtree_t *rtree,
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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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rtree_leaf_elm_contents_t contents = rtree_leaf_elm_bits_decode(
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old_bits);
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contents.szind = szind;
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uintptr_t bits = rtree_leaf_elm_bits_encode(contents);
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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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@ -269,9 +289,10 @@ rtree_leaf_elm_slab_write(tsdn_t *tsdn, rtree_t *rtree,
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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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rtree_leaf_elm_contents_t contents = rtree_leaf_elm_bits_decode(
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old_bits);
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contents.slab = slab;
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uintptr_t bits = rtree_leaf_elm_bits_encode(contents);
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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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@ -280,11 +301,9 @@ rtree_leaf_elm_slab_write(tsdn_t *tsdn, rtree_t *rtree,
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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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rtree_leaf_elm_t *elm, rtree_leaf_elm_contents_t contents) {
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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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uintptr_t bits = rtree_leaf_elm_bits_encode(contents);
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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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@ -382,7 +401,11 @@ rtree_write(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx, uintptr_t key,
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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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rtree_leaf_elm_contents_t contents;
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contents.edata = edata;
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contents.szind = szind;
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contents.slab = slab;
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rtree_leaf_elm_write(tsdn, rtree, elm, contents);
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return false;
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}
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@ -437,9 +460,11 @@ rtree_edata_szind_slab_read(tsdn_t *tsdn, rtree_t *rtree,
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}
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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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*r_edata = rtree_leaf_elm_bits_edata_get(bits);
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*r_szind = rtree_leaf_elm_bits_szind_get(bits);
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*r_slab = rtree_leaf_elm_bits_slab_get(bits);
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rtree_leaf_elm_contents_t contents = rtree_leaf_elm_bits_decode(bits);
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*r_edata = contents.edata;
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*r_szind = contents.szind;
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*r_slab = contents.slab;
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#else
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*r_edata = rtree_leaf_elm_edata_read(tsdn, rtree, elm, dependent);
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*r_szind = rtree_leaf_elm_szind_read(tsdn, rtree, elm, dependent);
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@ -473,8 +498,10 @@ rtree_szind_slab_read_fast(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx,
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#ifdef RTREE_LEAF_COMPACT
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uintptr_t bits = rtree_leaf_elm_bits_read(tsdn, rtree,
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elm, true);
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*r_szind = rtree_leaf_elm_bits_szind_get(bits);
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*r_slab = rtree_leaf_elm_bits_slab_get(bits);
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rtree_leaf_elm_contents_t contents = rtree_leaf_elm_bits_decode(
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bits);
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*r_szind = contents.szind;
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*r_slab = contents.slab;
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#else
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*r_szind = rtree_leaf_elm_szind_read(tsdn, rtree, elm, true);
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*r_slab = rtree_leaf_elm_slab_read(tsdn, rtree, elm, true);
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@ -494,8 +521,9 @@ rtree_szind_slab_read(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx,
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}
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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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*r_szind = rtree_leaf_elm_bits_szind_get(bits);
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*r_slab = rtree_leaf_elm_bits_slab_get(bits);
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rtree_leaf_elm_contents_t contents = rtree_leaf_elm_bits_decode(bits);
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*r_szind = contents.szind;
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*r_slab = contents.slab;
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#else
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*r_szind = rtree_leaf_elm_szind_read(tsdn, rtree, elm, dependent);
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*r_slab = rtree_leaf_elm_slab_read(tsdn, rtree, elm, dependent);
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@ -518,7 +546,11 @@ rtree_clear(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx,
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rtree_leaf_elm_t *elm = rtree_read(tsdn, rtree, rtree_ctx, key, true);
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assert(rtree_leaf_elm_edata_read(tsdn, rtree, elm, false) !=
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NULL);
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rtree_leaf_elm_write(tsdn, rtree, elm, NULL, SC_NSIZES, false);
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rtree_leaf_elm_contents_t contents;
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contents.edata = NULL;
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contents.szind = SC_NSIZES;
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contents.slab = false;
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rtree_leaf_elm_write(tsdn, rtree, elm, contents);
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}
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#endif /* JEMALLOC_INTERNAL_RTREE_H */
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18
src/emap.c
18
src/emap.c
@ -139,10 +139,13 @@ emap_rtree_leaf_elms_lookup(tsdn_t *tsdn, emap_t *emap, rtree_ctx_t *rtree_ctx,
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static void
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emap_rtree_write_acquired(tsdn_t *tsdn, emap_t *emap, rtree_leaf_elm_t *elm_a,
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rtree_leaf_elm_t *elm_b, edata_t *edata, szind_t szind, bool slab) {
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rtree_leaf_elm_write(tsdn, &emap->rtree, elm_a, edata, szind, slab);
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rtree_leaf_elm_contents_t contents;
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contents.edata = edata;
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contents.szind = szind;
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contents.slab = slab;
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rtree_leaf_elm_write(tsdn, &emap->rtree, elm_a, contents);
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if (elm_b != NULL) {
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rtree_leaf_elm_write(tsdn, &emap->rtree, elm_b, edata, szind,
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slab);
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rtree_leaf_elm_write(tsdn, &emap->rtree, elm_b, contents);
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}
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}
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@ -292,15 +295,20 @@ emap_merge_prepare(tsdn_t *tsdn, emap_t *emap, emap_prepare_t *prepare,
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void
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emap_merge_commit(tsdn_t *tsdn, emap_t *emap, emap_prepare_t *prepare,
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edata_t *lead, edata_t *trail) {
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rtree_leaf_elm_contents_t clear_contents;
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clear_contents.edata = NULL;
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clear_contents.szind = SC_NSIZES;
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clear_contents.slab = false;
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if (prepare->lead_elm_b != NULL) {
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rtree_leaf_elm_write(tsdn, &emap->rtree,
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prepare->lead_elm_b, NULL, SC_NSIZES, false);
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prepare->lead_elm_b, clear_contents);
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}
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rtree_leaf_elm_t *merged_b;
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if (prepare->trail_elm_b != NULL) {
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rtree_leaf_elm_write(tsdn, &emap->rtree,
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prepare->trail_elm_a, NULL, SC_NSIZES, false);
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prepare->trail_elm_a, clear_contents);
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merged_b = prepare->trail_elm_b;
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} else {
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merged_b = prepare->trail_elm_a;
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@ -137,8 +137,11 @@ TEST_BEGIN(test_rtree_random) {
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&rtree_ctx, keys[i], false, true);
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expect_ptr_not_null(elm,
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"Unexpected rtree_leaf_elm_lookup() failure");
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rtree_leaf_elm_write(tsdn, rtree, elm, &edata, SC_NSIZES,
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false);
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rtree_leaf_elm_contents_t contents;
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contents.edata = &edata;
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contents.szind = SC_NSIZES;
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contents.slab = false;
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rtree_leaf_elm_write(tsdn, rtree, elm, contents);
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expect_ptr_eq(rtree_edata_read(tsdn, rtree, &rtree_ctx,
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keys[i], true), &edata,
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"rtree_edata_read() should return previously set value");
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