From owner-dev-commits-src-all@freebsd.org Sat May 22 19:28:43 2021 Return-Path: Delivered-To: dev-commits-src-all@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 62E00636109; Sat, 22 May 2021 19:28:43 +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 4FnYRt6v8Dz3JpN; Sat, 22 May 2021 19:28:42 +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 C0CF31CBE; Sat, 22 May 2021 19:28:42 +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 14MJSgKh087314; Sat, 22 May 2021 19:28:42 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 14MJSgEn087313; Sat, 22 May 2021 19:28:42 GMT (envelope-from git) Date: Sat, 22 May 2021 19:28:42 GMT Message-Id: <202105221928.14MJSgEn087313@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Mateusz Guzik Subject: git: a0842e69aa5f - main - lockprof: add contested-only profiling MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: mjg X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: a0842e69aa5f86d61c072544b540ef21b2015211 Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-all@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for all branches of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 22 May 2021 19:28:43 -0000 The branch main has been updated by mjg: URL: https://cgit.FreeBSD.org/src/commit/?id=a0842e69aa5f86d61c072544b540ef21b2015211 commit a0842e69aa5f86d61c072544b540ef21b2015211 Author: Mateusz Guzik AuthorDate: 2021-05-18 19:07:19 +0000 Commit: Mateusz Guzik CommitDate: 2021-05-22 19:28:37 +0000 lockprof: add contested-only profiling This allows tracking all wait times with much smaller runtime impact. For example when doing -j 104 buildkernel on tmpfs: no profiling: 2921.70s user 282.72s system 6598% cpu 48.562 total all acquires: 2926.87s user 350.53s system 6656% cpu 49.237 total contested only: 2919.64s user 290.31s system 6583% cpu 48.756 total --- sys/kern/subr_lock.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/sys/kern/subr_lock.c b/sys/kern/subr_lock.c index 97b880b54ea2..9c433f683bac 100644 --- a/sys/kern/subr_lock.c +++ b/sys/kern/subr_lock.c @@ -272,6 +272,7 @@ DPCPU_DEFINE_STATIC(struct lock_prof_cpu, lp); #define LP_CPU(cpu) (DPCPU_ID_PTR((cpu), lp)) volatile int __read_mostly lock_prof_enable; +int __read_mostly lock_contested_only; static volatile int lock_prof_resetting; #define LPROF_SBUF_SIZE 256 @@ -605,6 +606,8 @@ lock_profile_obtain_lock_success(struct lock_object *lo, int contested, /* don't reset the timer when/if recursing */ if (!lock_prof_enable || (lo->lo_flags & LO_NOPROFILE)) return; + if (lock_contested_only && !contested) + return; spin = (LOCK_CLASS(lo)->lc_flags & LC_SPINLOCK) ? 1 : 0; if (spin && lock_prof_skipspin == 1) return; @@ -729,6 +732,8 @@ SYSCTL_INT(_debug_lock_prof, OID_AUTO, skipspin, CTLFLAG_RW, &lock_prof_skipspin, 0, "Skip profiling on spinlocks."); SYSCTL_INT(_debug_lock_prof, OID_AUTO, rejected, CTLFLAG_RD, &lock_prof_rejected, 0, "Number of rejected profiling records"); +SYSCTL_INT(_debug_lock_prof, OID_AUTO, contested_only, CTLFLAG_RW, + &lock_contested_only, 0, "Only profile contested acquires"); SYSCTL_PROC(_debug_lock_prof, OID_AUTO, stats, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, dump_lock_prof_stats, "A",