From nobody Wed Mar 4 13:58:47 2026 X-Original-To: dev-commits-src-branches@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4fQvQw30Qrz6TYCb for ; Wed, 04 Mar 2026 13:58:48 +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 "R12" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4fQvQw0gCnz3R8Q for ; Wed, 04 Mar 2026 13:58:48 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1772632728; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=+C4M+7ZR3repiqSt9hYDYG4raK6pc+AxlgrXj51Elfk=; b=rXOmWuMEkiO+yRZ5ojqqx9jUOCHFA9YgQ+lWPTjOuwsK+3+2bkIT/1SXY9BJvoqXHcKWij 8wG5fx3UISuRlpderZ7tT9nmNJmJ55+NJVYahTkDbCPtne66rj6XGONCFmRaLsu6t6xcLA 0xLNRcyueEbY2qgPrbLu9y3w7fzL8V/35GE1mukvFW44Qq5fA3djPAURDm2uarYtDkitR7 6j5v0Tjxq/tPdKJRK3snnUGtd6Wbg0NKZwq5Pu4pnlVwxKP9BSicvGl/cg3KFOsatNSemT IPqY9uoi7QiNjIzQYApKPIJIugunDvNVt2lq3Wps8icTpoijF4j4blACjMcSVg== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1772632728; a=rsa-sha256; cv=none; b=c5xsAl05JYeIrE1dqdYsMM2rzYtFXuJCR4TUg3FG0sUX2ipppGlDaSeRup9xsfUusOQEmR y4ZhPIkccIyYTV8rBSqn4YSmmpv3ayyKVEyQmAMxDunWcGNlmuCG8dHCre76Nrs5hC7mhD PoEKsHq5SVTDr/JmJNFEsHr6mw5esF6Ot3a7TUOtOGkqgPqhEXU6bc8lVejcy0gqnCMPfP /nLhRB2ey8ZzmrKPMnbly0cqXac3fdS6/zV2Y23XJmXmPkkuPUYlkv9VBHewQ4Qp7tam/3 M3sbp91+xKTmrwXTveZdLxS6P3gWQPf1znl+kDsKDiqpXm2cT26ZOBFfqDbjwQ== ARC-Authentication-Results: i=1; mx1.freebsd.org; none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1772632728; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=+C4M+7ZR3repiqSt9hYDYG4raK6pc+AxlgrXj51Elfk=; b=lqH/rAn/ytSoadmO2DYlI/7zk2gO4uV2Lu6UuDFu3GO2QM1+O0b5CHrtj79wKox/JZzz47 wl7oe+CbJn2xHAOhHm6JipzzUcODPnB6XUywfcj2gHJjhYVqPSEdO/nUwzsM7AUWBBQOoi hPbT781GZtEk3xlDs0VwqgSkt8iloQ34HJwb+lcIvSGvXCatQ2IQI2GK1kWlr4+QddPXRw Rn23VWjhkjMtXrAfAehmAkoUhXnmoITjB2HcSC3LAStxKyge+DWX97Sl76LgjxYQsvjYPe 3fdz3W3Z9ALS+UGWvMfyAxk/4oq0DuqZG1dSEVjRax3TmMDQcxNifwj8PfFSig== Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) by mxrelay.nyi.freebsd.org (Postfix) with ESMTP id 4fQvQv6twwztK4 for ; Wed, 04 Mar 2026 13:58:47 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from git (uid 1279) (envelope-from git@FreeBSD.org) id 21dd0 by gitrepo.freebsd.org (DragonFly Mail Agent v0.13+ on gitrepo.freebsd.org); Wed, 04 Mar 2026 13:58:47 +0000 To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: ShengYi Hung Subject: git: beccc030b4fb - stable/15 - smp: Use bitwise operation to count cpu number List-Id: Commits to the stable branches of the FreeBSD src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-branches List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-branches@freebsd.org Sender: owner-dev-commits-src-branches@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: aokblast X-Git-Repository: src X-Git-Refname: refs/heads/stable/15 X-Git-Reftype: branch X-Git-Commit: beccc030b4fbd411276858ba771b4228f3885568 Auto-Submitted: auto-generated Date: Wed, 04 Mar 2026 13:58:47 +0000 Message-Id: <69a83a97.21dd0.3c0c081f@gitrepo.freebsd.org> The branch stable/15 has been updated by aokblast: URL: https://cgit.FreeBSD.org/src/commit/?id=beccc030b4fbd411276858ba771b4228f3885568 commit beccc030b4fbd411276858ba771b4228f3885568 Author: ShengYi Hung AuthorDate: 2026-01-03 16:32:50 +0000 Commit: ShengYi Hung CommitDate: 2026-03-04 13:58:23 +0000 smp: Use bitwise operation to count cpu number Previously, we iterated over all CPUs using CPU_FOREACH and checked individual bits to count valid CPUs. Refactor this to use a bitwise AND and popcount to count the number of enabled bits directly. Approved by: markj (mentor) MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D54474 (cherry picked from commit e387d9438ba0258b88ebe03ef139bc6fd70b5a46) --- sys/kern/subr_smp.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/sys/kern/subr_smp.c b/sys/kern/subr_smp.c index d80048f961bd..bd4e5c4b5aeb 100644 --- a/sys/kern/subr_smp.c +++ b/sys/kern/subr_smp.c @@ -581,7 +581,7 @@ smp_rendezvous_cpus(cpuset_t map, void (* teardown_func)(void *), void *arg) { - int curcpumap, i, ncpus = 0; + int curcpumap, ncpus = 0; /* See comments in the !SMP case. */ if (!smp_started) { @@ -602,10 +602,8 @@ smp_rendezvous_cpus(cpuset_t map, */ MPASS(curthread->td_md.md_spinlock_count == 0); - CPU_FOREACH(i) { - if (CPU_ISSET(i, &map)) - ncpus++; - } + CPU_AND(&map, &map, &all_cpus); + ncpus = CPU_COUNT(&map); if (ncpus == 0) panic("ncpus is 0 with non-zero map");