Date: Fri, 18 Jul 2014 18:05:09 +0000 (UTC) From: Xin LI <delphij@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-vendor@freebsd.org Subject: svn commit: r268851 - in vendor-sys/illumos/dist/uts/common/fs/zfs: . sys Message-ID: <201407181805.s6II59HW001998@svn.freebsd.org>
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Author: delphij Date: Fri Jul 18 18:05:09 2014 New Revision: 268851 URL: http://svnweb.freebsd.org/changeset/base/268851 Log: 4753 increase number of outstanding async writes when sync task is waiting Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Adam Leventhal <ahl@delphix.com> Reviewed by: Christopher Siden <christopher.siden@delphix.com> Reviewed by: Dan McDonald <danmcd@omniti.com> Approved by: Garrett D'Amore <garrett@damore.org> illumos/illumos-gate@73527f441cbbd953fa42cc5a30a413bad75f24a9 Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/spa_misc.c vendor-sys/illumos/dist/uts/common/fs/zfs/sys/spa.h vendor-sys/illumos/dist/uts/common/fs/zfs/sys/txg.h vendor-sys/illumos/dist/uts/common/fs/zfs/txg.c vendor-sys/illumos/dist/uts/common/fs/zfs/vdev_queue.c Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/spa_misc.c ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/spa_misc.c Fri Jul 18 18:02:34 2014 (r268850) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/spa_misc.c Fri Jul 18 18:05:09 2014 (r268851) @@ -1876,6 +1876,16 @@ spa_writeable(spa_t *spa) return (!!(spa->spa_mode & FWRITE)); } +/* + * Returns true if there is a pending sync task in any of the current + * syncing txg, the current quiescing txg, or the current open txg. + */ +boolean_t +spa_has_pending_synctask(spa_t *spa) +{ + return (!txg_all_lists_empty(&spa->spa_dsl_pool->dp_sync_tasks)); +} + int spa_mode(spa_t *spa) { Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/sys/spa.h ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/sys/spa.h Fri Jul 18 18:02:34 2014 (r268850) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/sys/spa.h Fri Jul 18 18:05:09 2014 (r268851) @@ -780,6 +780,7 @@ extern uint64_t bp_get_dsize(spa_t *spa, extern boolean_t spa_has_slogs(spa_t *spa); extern boolean_t spa_is_root(spa_t *spa); extern boolean_t spa_writeable(spa_t *spa); +extern boolean_t spa_has_pending_synctask(spa_t *spa); extern int spa_mode(spa_t *spa); extern uint64_t strtonum(const char *str, char **nptr); Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/sys/txg.h ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/sys/txg.h Fri Jul 18 18:02:34 2014 (r268850) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/sys/txg.h Fri Jul 18 18:05:09 2014 (r268851) @@ -23,7 +23,7 @@ * Use is subject to license terms. */ /* - * Copyright (c) 2013 by Delphix. All rights reserved. + * Copyright (c) 2012, 2014 by Delphix. All rights reserved. */ #ifndef _SYS_TXG_H @@ -112,6 +112,7 @@ extern boolean_t txg_sync_waiting(struct extern void txg_list_create(txg_list_t *tl, size_t offset); extern void txg_list_destroy(txg_list_t *tl); extern boolean_t txg_list_empty(txg_list_t *tl, uint64_t txg); +extern boolean_t txg_all_lists_empty(txg_list_t *tl); extern boolean_t txg_list_add(txg_list_t *tl, void *p, uint64_t txg); extern boolean_t txg_list_add_tail(txg_list_t *tl, void *p, uint64_t txg); extern void *txg_list_remove(txg_list_t *tl, uint64_t txg); Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/txg.c ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/txg.c Fri Jul 18 18:02:34 2014 (r268850) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/txg.c Fri Jul 18 18:05:09 2014 (r268851) @@ -21,7 +21,7 @@ /* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. * Portions Copyright 2011 Martin Matuska - * Copyright (c) 2013 by Delphix. All rights reserved. + * Copyright (c) 2012, 2014 by Delphix. All rights reserved. */ #include <sys/zfs_context.h> @@ -718,6 +718,24 @@ txg_list_empty(txg_list_t *tl, uint64_t } /* + * Returns true if all txg lists are empty. + * + * Warning: this is inherently racy (an item could be added immediately after this + * function returns). We don't bother with the lock because it wouldn't change the + * semantics. + */ +boolean_t +txg_all_lists_empty(txg_list_t *tl) +{ + for (int i = 0; i < TXG_SIZE; i++) { + if (!txg_list_empty(tl, i)) { + return (B_FALSE); + } + } + return (B_TRUE); +} + +/* * Add an entry to the list (unless it's already on the list). * Returns B_TRUE if it was actually added. */ Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/vdev_queue.c ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/vdev_queue.c Fri Jul 18 18:02:34 2014 (r268850) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/vdev_queue.c Fri Jul 18 18:05:09 2014 (r268851) @@ -24,7 +24,7 @@ */ /* - * Copyright (c) 2013 by Delphix. All rights reserved. + * Copyright (c) 2012, 2014 by Delphix. All rights reserved. */ #include <sys/zfs_context.h> @@ -350,14 +350,23 @@ vdev_queue_class_min_active(zio_priority } static int -vdev_queue_max_async_writes(uint64_t dirty) +vdev_queue_max_async_writes(spa_t *spa) { int writes; + uint64_t dirty = spa->spa_dsl_pool->dp_dirty_total; uint64_t min_bytes = zfs_dirty_data_max * zfs_vdev_async_write_active_min_dirty_percent / 100; uint64_t max_bytes = zfs_dirty_data_max * zfs_vdev_async_write_active_max_dirty_percent / 100; + /* + * Sync tasks correspond to interactive user actions. To reduce the + * execution time of those actions we push data out as fast as possible. + */ + if (spa_has_pending_synctask(spa)) { + return (zfs_vdev_async_write_max_active); + } + if (dirty < min_bytes) return (zfs_vdev_async_write_min_active); if (dirty > max_bytes) @@ -390,8 +399,7 @@ vdev_queue_class_max_active(spa_t *spa, case ZIO_PRIORITY_ASYNC_READ: return (zfs_vdev_async_read_max_active); case ZIO_PRIORITY_ASYNC_WRITE: - return (vdev_queue_max_async_writes( - spa->spa_dsl_pool->dp_dirty_total)); + return (vdev_queue_max_async_writes(spa)); case ZIO_PRIORITY_SCRUB: return (zfs_vdev_scrub_max_active); default:
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