From owner-svn-src-stable-11@freebsd.org Tue Feb 25 15:53:18 2020 Return-Path: Delivered-To: svn-src-stable-11@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 94F9525ED31; Tue, 25 Feb 2020 15:53:18 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 48Rk3y3VLqz4D09; Tue, 25 Feb 2020 15:53:18 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 5C7DE18F2A; Tue, 25 Feb 2020 15:53:18 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 01PFrIMD075681; Tue, 25 Feb 2020 15:53:18 GMT (envelope-from mav@FreeBSD.org) Received: (from mav@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 01PFrHbl075678; Tue, 25 Feb 2020 15:53:17 GMT (envelope-from mav@FreeBSD.org) Message-Id: <202002251553.01PFrHbl075678@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: mav set sender to mav@FreeBSD.org using -f From: Alexander Motin Date: Tue, 25 Feb 2020 15:53:17 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r358313 - in stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs: . sys X-SVN-Group: stable-11 X-SVN-Commit-Author: mav X-SVN-Commit-Paths: in stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs: . sys X-SVN-Commit-Revision: 358313 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-11@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for only the 11-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Feb 2020 15:53:18 -0000 Author: mav Date: Tue Feb 25 15:53:17 2020 New Revision: 358313 URL: https://svnweb.freebsd.org/changeset/base/358313 Log: MFC r349381: Avoid extra taskq_dispatch() calls by DMU. DMU sync code calls taskq_dispatch() for each sublist of os_dirty_dnodes and os_synced_dnodes. Since the number of sublists by default is equal to number of CPUs, it will dispatch equal, potentially large, number of tasks, waking up many CPUs to handle them, even if only one or few of sublists actually have any work to do. This change adds check for empty sublists to avoid this. Modified: stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_objset.c stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/multilist.c stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/multilist.h Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_objset.c ============================================================================== --- stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_objset.c Tue Feb 25 15:52:35 2020 (r358312) +++ stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_objset.c Tue Feb 25 15:53:17 2020 (r358313) @@ -1294,6 +1294,8 @@ dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx zio_t *zio; list_t *list; dbuf_dirty_record_t *dr; + int num_sublists; + multilist_t *ml; blkptr_t *blkptr_copy = kmem_alloc(sizeof (*os->os_rootbp), KM_SLEEP); *blkptr_copy = *os->os_rootbp; @@ -1362,10 +1364,13 @@ dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx } } - for (int i = 0; - i < multilist_get_num_sublists(os->os_dirty_dnodes[txgoff]); i++) { + ml = os->os_dirty_dnodes[txgoff]; + num_sublists = multilist_get_num_sublists(ml); + for (int i = 0; i < num_sublists; i++) { + if (multilist_sublist_is_empty_idx(ml, i)) + continue; sync_dnodes_arg_t *sda = kmem_alloc(sizeof (*sda), KM_SLEEP); - sda->sda_list = os->os_dirty_dnodes[txgoff]; + sda->sda_list = ml; sda->sda_sublist_idx = i; sda->sda_tx = tx; (void) taskq_dispatch(dmu_objset_pool(os)->dp_sync_taskq, @@ -1579,6 +1584,8 @@ userquota_updates_task(void *arg) void dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx) { + int num_sublists; + if (!dmu_objset_userused_enabled(os)) return; @@ -1592,8 +1599,10 @@ dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); } - for (int i = 0; - i < multilist_get_num_sublists(os->os_synced_dnodes); i++) { + num_sublists = multilist_get_num_sublists(os->os_synced_dnodes); + for (int i = 0; i < num_sublists; i++) { + if (multilist_sublist_is_empty_idx(os->os_synced_dnodes, i)) + continue; userquota_updates_arg_t *uua = kmem_alloc(sizeof (*uua), KM_SLEEP); uua->uua_os = os; Modified: stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/multilist.c ============================================================================== --- stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/multilist.c Tue Feb 25 15:52:35 2020 (r358312) +++ stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/multilist.c Tue Feb 25 15:53:17 2020 (r358313) @@ -360,6 +360,28 @@ multilist_sublist_remove(multilist_sublist_t *mls, voi list_remove(&mls->mls_list, obj); } +int +multilist_sublist_is_empty(multilist_sublist_t *mls) +{ + ASSERT(MUTEX_HELD(&mls->mls_lock)); + return (list_is_empty(&mls->mls_list)); +} + +int +multilist_sublist_is_empty_idx(multilist_t *ml, unsigned int sublist_idx) +{ + multilist_sublist_t *mls; + int empty; + + ASSERT3U(sublist_idx, <, ml->ml_num_sublists); + mls = &ml->ml_sublists[sublist_idx]; + ASSERT(!MUTEX_HELD(&mls->mls_lock)); + mutex_enter(&mls->mls_lock); + empty = list_is_empty(&mls->mls_list); + mutex_exit(&mls->mls_lock); + return (empty); +} + void * multilist_sublist_head(multilist_sublist_t *mls) { Modified: stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/multilist.h ============================================================================== --- stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/multilist.h Tue Feb 25 15:52:35 2020 (r358312) +++ stable/11/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/multilist.h Tue Feb 25 15:53:17 2020 (r358313) @@ -90,6 +90,8 @@ void multilist_sublist_insert_head(multilist_sublist_t void multilist_sublist_insert_tail(multilist_sublist_t *, void *); void multilist_sublist_move_forward(multilist_sublist_t *mls, void *obj); void multilist_sublist_remove(multilist_sublist_t *, void *); +int multilist_sublist_is_empty(multilist_sublist_t *); +int multilist_sublist_is_empty_idx(multilist_t *, unsigned int); void *multilist_sublist_head(multilist_sublist_t *); void *multilist_sublist_tail(multilist_sublist_t *);