Date: Wed, 21 Feb 2018 22:14:20 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-vendor@freebsd.org Subject: svn commit: r329757 - vendor-sys/illumos/dist/uts/common/fs/zfs Message-ID: <201802212214.w1LMEK5u041701@repo.freebsd.org>
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Author: mav Date: Wed Feb 21 22:14:19 2018 New Revision: 329757 URL: https://svnweb.freebsd.org/changeset/base/329757 Log: 9018 Replace kmem_cache_reap_now() with kmem_cache_reap_soon() illumos/illumos-gate@36a64e62848b51ac5a9a5216e894ec723cfef14e To prevent kmem_cache reaping from blocking other system resources, turn kmem_cache_reap_now() (which blocks) into kmem_cache_reap_soon(). Callers to kmem_cache_reap_soon() should use kmem_cache_reap_active(), which exploits #9017's new taskq_empty(). Reviewed by: Bryan Cantrill <bryan@joyent.com> Reviewed by: Dan McDonald <danmcd@joyent.com> Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed by: Yuri Pankov <yuripv@yuripv.net> Author: Tim Kordas <tim.kordas@joyent.com> Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/arc.c Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/arc.c ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/arc.c Wed Feb 21 21:39:47 2018 (r329756) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/arc.c Wed Feb 21 22:14:19 2018 (r329757) @@ -20,7 +20,7 @@ */ /* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. - * Copyright (c) 2012, Joyent, Inc. All rights reserved. + * Copyright (c) 2018, Joyent, Inc. * Copyright (c) 2011, 2017 by Delphix. All rights reserved. * Copyright (c) 2014 by Saso Kiselkov. All rights reserved. * Copyright 2017 Nexenta Systems, Inc. All rights reserved. @@ -301,6 +301,9 @@ int zfs_arc_evict_batch_limit = 10; /* number of seconds before growing cache again */ static int arc_grow_retry = 60; +/* number of milliseconds before attempting a kmem-cache-reap */ +static int arc_kmem_cache_reap_retry_ms = 1000; + /* shift of arc_c for calculating overflow limit in arc_get_data_impl */ int zfs_arc_overflow_shift = 8; @@ -4047,21 +4050,31 @@ arc_kmem_reap_now(void) #endif #endif + /* + * If a kmem reap is already active, don't schedule more. We must + * check for this because kmem_cache_reap_soon() won't actually + * block on the cache being reaped (this is to prevent callers from + * becoming implicitly blocked by a system-wide kmem reap -- which, + * on a system with many, many full magazines, can take minutes). + */ + if (kmem_cache_reap_active()) + return; + for (i = 0; i < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; i++) { if (zio_buf_cache[i] != prev_cache) { prev_cache = zio_buf_cache[i]; - kmem_cache_reap_now(zio_buf_cache[i]); + kmem_cache_reap_soon(zio_buf_cache[i]); } if (zio_data_buf_cache[i] != prev_data_cache) { prev_data_cache = zio_data_buf_cache[i]; - kmem_cache_reap_now(zio_data_buf_cache[i]); + kmem_cache_reap_soon(zio_data_buf_cache[i]); } } - kmem_cache_reap_now(abd_chunk_cache); - kmem_cache_reap_now(buf_cache); - kmem_cache_reap_now(hdr_full_cache); - kmem_cache_reap_now(hdr_l2only_cache); - kmem_cache_reap_now(range_seg_cache); + kmem_cache_reap_soon(abd_chunk_cache); + kmem_cache_reap_soon(buf_cache); + kmem_cache_reap_soon(hdr_full_cache); + kmem_cache_reap_soon(hdr_l2only_cache); + kmem_cache_reap_soon(range_seg_cache); if (zio_arena != NULL) { /* @@ -4093,6 +4106,7 @@ static void arc_reclaim_thread(void *unused) { hrtime_t growtime = 0; + hrtime_t kmem_reap_time = 0; callb_cpr_t cpr; CALLB_CPR_INIT(&cpr, &arc_reclaim_lock, callb_generic_cpr, FTAG); @@ -4126,7 +4140,7 @@ arc_reclaim_thread(void *unused) int64_t free_memory = arc_available_memory(); if (free_memory < 0) { - + hrtime_t curtime = gethrtime(); arc_no_grow = B_TRUE; arc_warm = B_TRUE; @@ -4134,9 +4148,20 @@ arc_reclaim_thread(void *unused) * Wait at least zfs_grow_retry (default 60) seconds * before considering growing. */ - growtime = gethrtime() + SEC2NSEC(arc_grow_retry); + growtime = curtime + SEC2NSEC(arc_grow_retry); - arc_kmem_reap_now(); + /* + * Wait at least arc_kmem_cache_reap_retry_ms + * between arc_kmem_reap_now() calls. Without + * this check it is possible to end up in a + * situation where we spend lots of time + * reaping caches, while we're near arc_c_min. + */ + if (curtime >= kmem_reap_time) { + arc_kmem_reap_now(); + kmem_reap_time = gethrtime() + + MSEC2NSEC(arc_kmem_cache_reap_retry_ms); + } /* * If we are still low on memory, shrink the ARC
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