From owner-svn-src-stable-12@freebsd.org Wed Jun 5 00:51:52 2019 Return-Path: Delivered-To: svn-src-stable-12@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 3B5B315C12E4; Wed, 5 Jun 2019 00:51:52 +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 D49F68C32F; Wed, 5 Jun 2019 00:51:51 +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 B09C7256CD; Wed, 5 Jun 2019 00:51:51 +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 x550pppP033999; Wed, 5 Jun 2019 00:51:51 GMT (envelope-from mav@FreeBSD.org) Received: (from mav@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x550pp8A033998; Wed, 5 Jun 2019 00:51:51 GMT (envelope-from mav@FreeBSD.org) Message-Id: <201906050051.x550pp8A033998@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: mav set sender to mav@FreeBSD.org using -f From: Alexander Motin Date: Wed, 5 Jun 2019 00:51:51 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r348676 - stable/12/sys/cddl/contrib/opensolaris/uts/common/fs/zfs X-SVN-Group: stable-12 X-SVN-Commit-Author: mav X-SVN-Commit-Paths: stable/12/sys/cddl/contrib/opensolaris/uts/common/fs/zfs X-SVN-Commit-Revision: 348676 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: D49F68C32F X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-2.97 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; NEURAL_HAM_SHORT(-0.97)[-0.967,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US]; NEURAL_HAM_LONG(-1.00)[-1.000,0] X-BeenThere: svn-src-stable-12@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for only the 12-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 05 Jun 2019 00:51:52 -0000 Author: mav Date: Wed Jun 5 00:51:51 2019 New Revision: 348676 URL: https://svnweb.freebsd.org/changeset/base/348676 Log: MFC r348117: Allocate buffers smaller then ABD chunk size as linear. This allows to reduce memory waste by letting UMA to put multiple small buffers into one memory page slab. The page sharing means that UMA may not be able to free memory page when some of buffers are freed, but alternatively memory used by that buffer would just be wasted from the beginning. This change follows alike change in ZoL, but unlike Linux (according to my understanding of it from comments) FreeBSD never shares slabs bigger then one memory page, so this should be even less invasive then there. Modified: stable/12/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c ============================================================================== --- stable/12/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c Wed Jun 5 00:08:30 2019 (r348675) +++ stable/12/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c Wed Jun 5 00:51:51 2019 (r348676) @@ -290,7 +290,7 @@ abd_free_struct(abd_t *abd) abd_t * abd_alloc(size_t size, boolean_t is_metadata) { - if (!zfs_abd_scatter_enabled) + if (!zfs_abd_scatter_enabled || size <= zfs_abd_chunk_size) return (abd_alloc_linear(size, is_metadata)); VERIFY3U(size, <=, SPA_MAXBLOCKSIZE);