From 089570da83834fab086887e58aae25d9a01395c3 Mon Sep 17 00:00:00 2001 From: mav Date: Tue, 3 Feb 2015 08:06:13 +0000 Subject: [PATCH] MFC r277419: Allow skipping dmu_buf_will_dirty() call in dsl_dir_transfer_space(). dsl_dir_transfer_space() is mostly called after dsl_dir_diduse_space(), which already calls dmu_buf_will_dirty() for the same dbuf and tx, so its duplicate call in those cases will change nothing, only spend time. Skipping this call by four times reduces time spent in dbuf_write_done() and descendants, updating dataset statistics with several congested lock acquisitions. When rewriting 8K zvol blocks at 1GB/s rate, this reduces CPU time spent inside dbuf_write_done(), according to profiling, from 45% of 683K samples to 18% of 422K. git-svn-id: svn://svn.freebsd.org/base/stable/10@278142 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f --- .../contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c | 6 +++--- sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dir.c | 7 ++++--- 2 files changed, 7 insertions(+), 6 deletions(-) diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c index 34bef4ee5..ce22f4efb 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c @@ -136,7 +136,7 @@ dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, compressed, uncompressed, tx); dsl_dir_transfer_space(ds->ds_dir, used - delta, - DD_USED_REFRSRV, DD_USED_HEAD, tx); + DD_USED_REFRSRV, DD_USED_HEAD, NULL); } int @@ -179,7 +179,7 @@ dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, -compressed, -uncompressed, tx); dsl_dir_transfer_space(ds->ds_dir, -used - delta, - DD_USED_REFRSRV, DD_USED_HEAD, tx); + DD_USED_REFRSRV, DD_USED_HEAD, NULL); } else { dprintf_bp(bp, "putting on dead list: %s", ""); if (async) { @@ -2837,7 +2837,7 @@ dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, origin_head->ds_dir->dd_origin_txg, UINT64_MAX, &odl_used, &odl_comp, &odl_uncomp); dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, - DD_USED_HEAD, DD_USED_SNAP, tx); + DD_USED_HEAD, DD_USED_SNAP, NULL); } /* swap ds_*_bytes */ diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dir.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dir.c index 5a891d1ba..1862f8cb8 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dir.c +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dir.c @@ -1389,7 +1389,7 @@ dsl_dir_diduse_space(dsl_dir_t *dd, dd_used_t type, accounted_delta, compressed, uncompressed, tx); dsl_dir_transfer_space(dd->dd_parent, used - accounted_delta, - DD_USED_CHILD_RSRV, DD_USED_CHILD, tx); + DD_USED_CHILD_RSRV, DD_USED_CHILD, NULL); } } @@ -1397,7 +1397,7 @@ void dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta, dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx) { - ASSERT(dmu_tx_is_syncing(tx)); + ASSERT(tx == NULL || dmu_tx_is_syncing(tx)); ASSERT(oldtype < DD_USED_NUM); ASSERT(newtype < DD_USED_NUM); @@ -1405,7 +1405,8 @@ dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta, !(dsl_dir_phys(dd)->dd_flags & DD_FLAG_USED_BREAKDOWN)) return; - dmu_buf_will_dirty(dd->dd_dbuf, tx); + if (tx != NULL) + dmu_buf_will_dirty(dd->dd_dbuf, tx); mutex_enter(&dd->dd_lock); ASSERT(delta > 0 ? dsl_dir_phys(dd)->dd_used_breakdown[oldtype] >= delta : -- 2.45.0