From owner-svn-src-head@freebsd.org Tue Feb 20 04:14:13 2018 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 02D34F24B26; Tue, 20 Feb 2018 04:14:13 +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 TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id A545A7FDB4; Tue, 20 Feb 2018 04:14:12 +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 A019724478; Tue, 20 Feb 2018 04:14:12 +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 w1K4ECV0058634; Tue, 20 Feb 2018 04:14:12 GMT (envelope-from mav@FreeBSD.org) Received: (from mav@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w1K4ECqt058633; Tue, 20 Feb 2018 04:14:12 GMT (envelope-from mav@FreeBSD.org) Message-Id: <201802200414.w1K4ECqt058633@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: mav set sender to mav@FreeBSD.org using -f From: Alexander Motin Date: Tue, 20 Feb 2018 04:14:12 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r329623 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs X-SVN-Group: head X-SVN-Commit-Author: mav X-SVN-Commit-Paths: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs X-SVN-Commit-Revision: 329623 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Feb 2018 04:14:13 -0000 Author: mav Date: Tue Feb 20 04:14:12 2018 New Revision: 329623 URL: https://svnweb.freebsd.org/changeset/base/329623 Log: MFV r302649: 7016 arc_available_memory is not 32-bit safe illumos/illumos-gate@0dd053d7d890618ea1fc697b07de364e69eb4190 https://github.com/illumos/illumos-gate/commit/0dd053d7d890618ea1fc697b07de364e69eb4190 https://www.illumos.org/issues/7016 upstream DLPX-39446 arc_available_memory is not 32-bit safe https://github.com/delphix/delphix-os/commit/ 6b353ea3b8a1610be22e71e657d051743c64190b related to this upstream: DLPX-38547 delphix engine hang https://github.com/delphix/delphix-os/commit/ 3183a567b3e8c62a74a65885ca60c86f3d693783 DLPX-38547 delphix engine hang (fix static global) https://github.com/delphix/delphix-os/commit/ 22ac551d8ef085ad66cc8f65e51ac372b12993b9 DLPX-38882 system hung waiting on free segment https://github.com/delphix/delphix-os/commit/ cdd6beef7548cd3b12f0fc0328eeb3af540079c2 Reviewed by: Igor Kozhukhov Reviewed by: Matthew Ahrens Reviewed by: Paul Dagnelie Reviewed by: George Wilson Approved by: Gordon Ross Author: Prakash Surya Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c Directory Properties: head/sys/cddl/contrib/opensolaris/ (props changed) Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c ============================================================================== --- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c Tue Feb 20 04:11:48 2018 (r329622) +++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c Tue Feb 20 04:14:12 2018 (r329623) @@ -350,6 +350,11 @@ extern boolean_t zfs_prefetch_disable; static boolean_t arc_warm; /* + * log2 fraction of the zio arena to keep free. + */ +int arc_zio_arena_free_shift = 2; + +/* * These tunables are for performance analysis. */ uint64_t zfs_arc_max; @@ -4321,15 +4326,16 @@ arc_available_memory(void) /* * If zio data pages are being allocated out of a separate heap segment, * then enforce that the size of available vmem for this arena remains - * above about 1/16th free. + * above about 1/4th (1/(2^arc_zio_arena_free_shift)) free. * - * Note: The 1/16th arena free requirement was put in place - * to aggressively evict memory from the arc in order to avoid - * memory fragmentation issues. + * Note that reducing the arc_zio_arena_free_shift keeps more virtual + * memory (in the zio_arena) free, which can avoid memory + * fragmentation issues. */ if (zio_arena != NULL) { n = (int64_t)vmem_size(zio_arena, VMEM_FREE) - - (vmem_size(zio_arena, VMEM_ALLOC) >> 4); + (vmem_size(zio_arena, VMEM_ALLOC) >> + arc_zio_arena_free_shift); if (n < lowest) { lowest = n; r = FMR_ZIO_ARENA;