Author: avg Date: Thu Nov 9 18:21:17 2017 New Revision: 325609 URL: https://svnweb.freebsd.org/changeset/base/325609
Log: 7531 Assign correct flags to prefetched buffers illumos/illumos-gate@272952165423c254ad7708f1b3fe2ff0a6ce408b https://github.com/illumos/illumos-gate/commit/272952165423c254ad7708f1b3fe2ff0a6ce408b https://www.illumos.org/issues/7531 I found that some buffers that could be L2ARC eligible are not flagged such, leading to some performance impact. As a test I ran the same IO workload 10 times in a raw. It is a metadata only workload (files listing). l2arc_noprefetch=0. Reviewed by: Matthew Ahrens <mahr...@delphix.com> Reviewed by: Prakash Surya <prakash.su...@delphix.com> Approved by: Dan McDonald <dan...@joyent.com> Author: benrubson <ben.rub...@gmail.com> MFC after: 8 days Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/dbuf.c vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dbuf.h Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/dbuf.c ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/dbuf.c Thu Nov 9 18:14:42 2017 (r325608) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/dbuf.c Thu Nov 9 18:21:17 2017 (r325609) @@ -2374,6 +2374,10 @@ dbuf_prefetch_indirect_done(zio_t *zio, arc_buf_t *abu arc_flags_t iter_aflags = ARC_FLAG_NOWAIT; zbookmark_phys_t zb; + /* flag if L2ARC eligible, l2arc_noprefetch then decides */ + if (dpa->dpa_aflags & ARC_FLAG_L2CACHE) + iter_aflags |= ARC_FLAG_L2CACHE; + ASSERT3U(dpa->dpa_curlevel, ==, BP_GET_LEVEL(bp)); SET_BOOKMARK(&zb, dpa->dpa_zb.zb_objset, @@ -2483,6 +2487,10 @@ dbuf_prefetch(dnode_t *dn, int64_t level, uint64_t blk dpa->dpa_epbs = epbs; dpa->dpa_zio = pio; + /* flag if L2ARC eligible, l2arc_noprefetch then decides */ + if (DNODE_LEVEL_IS_L2CACHEABLE(dn, level)) + dpa->dpa_aflags |= ARC_FLAG_L2CACHE; + /* * If we have the indirect just above us, no need to do the asynchronous * prefetch chain; we'll just run the last step ourselves. If we're at @@ -2497,6 +2505,10 @@ dbuf_prefetch(dnode_t *dn, int64_t level, uint64_t blk } else { arc_flags_t iter_aflags = ARC_FLAG_NOWAIT; zbookmark_phys_t zb; + + /* flag if L2ARC eligible, l2arc_noprefetch then decides */ + if (DNODE_LEVEL_IS_L2CACHEABLE(dn, level)) + iter_aflags |= ARC_FLAG_L2CACHE; SET_BOOKMARK(&zb, ds != NULL ? ds->ds_object : DMU_META_OBJSET, dn->dn_object, curlevel, curblkid); Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dbuf.h ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dbuf.h Thu Nov 9 18:14:42 2017 (r325608) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dbuf.h Thu Nov 9 18:21:17 2017 (r325609) @@ -347,6 +347,12 @@ boolean_t dbuf_is_metadata(dmu_buf_impl_t *db); (dbuf_is_metadata(_db) && \ ((_db)->db_objset->os_secondary_cache == ZFS_CACHE_METADATA))) +#define DNODE_LEVEL_IS_L2CACHEABLE(_dn, _level) \ + ((_dn)->dn_objset->os_secondary_cache == ZFS_CACHE_ALL || \ + (((_level) > 0 || \ + DMU_OT_IS_METADATA((_dn)->dn_handle->dnh_dnode->dn_type)) && \ + ((_dn)->dn_objset->os_secondary_cache == ZFS_CACHE_METADATA))) + #ifdef ZFS_DEBUG /* _______________________________________________ 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"
