From owner-dev-commits-src-main@freebsd.org Thu Mar 4 14:46:53 2021 Return-Path: Delivered-To: dev-commits-src-main@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 D850A54D0EC; Thu, 4 Mar 2021 14:46:53 +0000 (UTC) (envelope-from git@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) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Drtx93yfyz3sYR; Thu, 4 Mar 2021 14:46:53 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 783691F03D; Thu, 4 Mar 2021 14:46:53 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 124EkrBG019178; Thu, 4 Mar 2021 14:46:53 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 124EkrKc019177; Thu, 4 Mar 2021 14:46:53 GMT (envelope-from git) Date: Thu, 4 Mar 2021 14:46:53 GMT Message-Id: <202103041446.124EkrKc019177@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Alan Somers Subject: git: f05b724ecb31 - main - Modernize geom_stats_snapshot_get MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: asomers X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: f05b724ecb310fb91da1947ae6c68647f58f5f12 Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-main@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for the main branch of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Mar 2021 14:46:54 -0000 The branch main has been updated by asomers: URL: https://cgit.FreeBSD.org/src/commit/?id=f05b724ecb310fb91da1947ae6c68647f58f5f12 commit f05b724ecb310fb91da1947ae6c68647f58f5f12 Author: Alan Somers AuthorDate: 2021-03-03 20:06:38 +0000 Commit: Alan Somers CommitDate: 2021-03-04 14:45:48 +0000 Modernize geom_stats_snapshot_get * A logically useless memset() is used to fault in some memory pages. Change it to explicit_bzero so the compiler won't eliminate it. * Eliminate the second memset. It made sense in the days of the Big Kernel Lock, but not in the days of fine-grained SMP and especially not in the days of VDSO. MFC after: 2 weeks Sponsored by: Axcient Reviewed by: phk Differential Revision: https://reviews.freebsd.org/D29047 --- lib/libgeom/geom_stats.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/lib/libgeom/geom_stats.c b/lib/libgeom/geom_stats.c index 450ee491ea1c..7c9191e29686 100644 --- a/lib/libgeom/geom_stats.c +++ b/lib/libgeom/geom_stats.c @@ -136,9 +136,8 @@ geom_stats_snapshot_get(void) free(sp); return (NULL); } - memset(sp->ptr, 0, pagesize * npages); /* page in, cache */ + explicit_bzero(sp->ptr, pagesize * npages); /* page in, cache */ clock_gettime(CLOCK_REALTIME, &sp->time); - memset(sp->ptr, 0, pagesize * npages); /* page in, cache */ memcpy(sp->ptr, statp, pagesize * npages); sp->pages = npages; sp->perpage = spp;