Author: avg Date: Wed Oct 16 08:01:36 2019 New Revision: 353630 URL: https://svnweb.freebsd.org/changeset/base/353630
Log: 10809 Performance optimization of AVL tree comparator functions illumos/illumos-gate@c4ab0d3f46036e85ad0700125c5a83cc139f55a3 https://github.com/illumos/illumos-gate/commit/c4ab0d3f46036e85ad0700125c5a83cc139f55a3 https://www.illumos.org/issues/10809 Port ZoL ee36c709c3d Performance optimization of AVL tree comparator functions From the ZoL commit msg: perf: 2.75x faster ddt_entry_compare() First 256bits of ddt_key_t is a block checksum, which are expected to be close to random data. Hence, on average, comparison only needs to look at first few bytes of the keys. To reduce number of conditional jump instructions, the result is computed as: sign(memcmp(k1, k2)). Sign of an integer 'a' can be obtained as: `(0 < a) - (a < 0)` := {-1, 0, 1}, which is computed efficiently. Synthetic performance evaluation of original and new algorithm over 1G random keys on 2.6GHz Intel(R) Xeon(R) CPU E5-2660 v3: old 6.85789 s new 2.49089 s perf: 2.8x faster vdev_queue_offset_compare() and vdev_queue_timestamp_compare() Compute the result directly instead of using conditionals perf: zfs_range_compare() Speedup between 1.1x - 2.5x, depending on compiler version and optimization level. perf: spa_error_entry_compare() `bcmp()` is not suitable for comparator use. Use `memcmp()` instead. perf: 2.8x faster metaslab_compare() and metaslab_rangesize_compare() perf: 2.8x faster zil_bp_compare() Portions contributed by: Jerry Jelinek <jerry.jeli...@joyent.com> Author: Gvozden Neskovic <nesko...@gmail.com> Modified: vendor/illumos/dist/lib/libzfs/common/libzfs_dataset.c vendor/illumos/dist/lib/libzfs/common/libzfs_iter.c vendor/illumos/dist/lib/libzfs/common/libzfs_sendrecv.c vendor/illumos/dist/lib/libzpool/common/sys/zfs_context.h Changes in other areas also in this revision: Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/ddt.c vendor-sys/illumos/dist/uts/common/fs/zfs/dnode.c vendor-sys/illumos/dist/uts/common/fs/zfs/dsl_deadlist.c vendor-sys/illumos/dist/uts/common/fs/zfs/dsl_deleg.c vendor-sys/illumos/dist/uts/common/fs/zfs/lz4.c vendor-sys/illumos/dist/uts/common/fs/zfs/metaslab.c vendor-sys/illumos/dist/uts/common/fs/zfs/range_tree.c vendor-sys/illumos/dist/uts/common/fs/zfs/sa.c vendor-sys/illumos/dist/uts/common/fs/zfs/spa.c vendor-sys/illumos/dist/uts/common/fs/zfs/spa_misc.c vendor-sys/illumos/dist/uts/common/fs/zfs/space_reftree.c vendor-sys/illumos/dist/uts/common/fs/zfs/sys/zfs_context.h vendor-sys/illumos/dist/uts/common/fs/zfs/unique.c vendor-sys/illumos/dist/uts/common/fs/zfs/vdev_cache.c vendor-sys/illumos/dist/uts/common/fs/zfs/vdev_label.c vendor-sys/illumos/dist/uts/common/fs/zfs/vdev_queue.c vendor-sys/illumos/dist/uts/common/fs/zfs/zap_micro.c vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_fuid.c vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_rlock.c vendor-sys/illumos/dist/uts/common/fs/zfs/zil.c vendor-sys/illumos/dist/uts/common/sys/avl.h Modified: vendor/illumos/dist/lib/libzfs/common/libzfs_dataset.c ============================================================================== --- vendor/illumos/dist/lib/libzfs/common/libzfs_dataset.c Wed Oct 16 07:57:58 2019 (r353629) +++ vendor/illumos/dist/lib/libzfs/common/libzfs_dataset.c Wed Oct 16 08:01:36 2019 (r353630) @@ -772,15 +772,13 @@ typedef struct mnttab_node { static int libzfs_mnttab_cache_compare(const void *arg1, const void *arg2) { - const mnttab_node_t *mtn1 = arg1; - const mnttab_node_t *mtn2 = arg2; + const mnttab_node_t *mtn1 = (const mnttab_node_t *)arg1; + const mnttab_node_t *mtn2 = (const mnttab_node_t *)arg2; int rv; rv = strcmp(mtn1->mtn_mt.mnt_special, mtn2->mtn_mt.mnt_special); - if (rv == 0) - return (0); - return (rv > 0 ? 1 : -1); + return (AVL_ISIGN(rv)); } void Modified: vendor/illumos/dist/lib/libzfs/common/libzfs_iter.c ============================================================================== --- vendor/illumos/dist/lib/libzfs/common/libzfs_iter.c Wed Oct 16 07:57:58 2019 (r353629) +++ vendor/illumos/dist/lib/libzfs/common/libzfs_iter.c Wed Oct 16 08:01:36 2019 (r353630) @@ -272,12 +272,7 @@ zfs_snapshot_compare(const void *larg, const void *rar lcreate = zfs_prop_get_int(l, ZFS_PROP_CREATETXG); rcreate = zfs_prop_get_int(r, ZFS_PROP_CREATETXG); - if (lcreate < rcreate) - return (-1); - else if (lcreate > rcreate) - return (+1); - else - return (0); + return (AVL_CMP(lcreate, rcreate)); } int Modified: vendor/illumos/dist/lib/libzfs/common/libzfs_sendrecv.c ============================================================================== --- vendor/illumos/dist/lib/libzfs/common/libzfs_sendrecv.c Wed Oct 16 07:57:58 2019 (r353629) +++ vendor/illumos/dist/lib/libzfs/common/libzfs_sendrecv.c Wed Oct 16 08:01:36 2019 (r353630) @@ -482,15 +482,10 @@ typedef struct fsavl_node { static int fsavl_compare(const void *arg1, const void *arg2) { - const fsavl_node_t *fn1 = arg1; - const fsavl_node_t *fn2 = arg2; + const fsavl_node_t *fn1 = (const fsavl_node_t *)arg1; + const fsavl_node_t *fn2 = (const fsavl_node_t *)arg2; - if (fn1->fn_guid > fn2->fn_guid) - return (+1); - else if (fn1->fn_guid < fn2->fn_guid) - return (-1); - else - return (0); + return (AVL_CMP(fn1->fn_guid, fn2->fn_guid)); } /* Modified: vendor/illumos/dist/lib/libzpool/common/sys/zfs_context.h ============================================================================== --- vendor/illumos/dist/lib/libzpool/common/sys/zfs_context.h Wed Oct 16 07:57:58 2019 (r353629) +++ vendor/illumos/dist/lib/libzpool/common/sys/zfs_context.h Wed Oct 16 08:01:36 2019 (r353630) @@ -285,6 +285,14 @@ extern vnode_t *rootdir; #define minclsyspri 60 #define maxclsyspri 99 +#if (GCC_VERSION >= 302) || (__INTEL_COMPILER >= 800) || defined(__clang__) +#define _zfs_expect(expr, value) (__builtin_expect((expr), (value))) +#else +#define _zfs_expect(expr, value) (expr) +#endif + +#define likely(x) _zfs_expect((x) != 0, 1) + #define CPU_SEQID (thr_self() & (max_ncpus - 1)) extern void kernel_init(int); _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
