From nobody Wed Mar 4 14:21:55 2026 X-Original-To: dev-commits-src-all@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 4fQvxc3fhyz6TZLW for ; Wed, 04 Mar 2026 14:21:56 +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 4fQvxc1ZGhz3V23 for ; Wed, 04 Mar 2026 14:21:56 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1772634116; 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=MWQLWx+3uVcF4csywmcyMwgL9rfLqj1A8XuHhcWHP6M=; b=j5fTwliKTo8raBRZ34CiOMI5zloPJkt8oWiPxfLyUV3w2KtujYCpNvXjfwQIfTIAhNqvlN jjbxdS9mRbmg2lHnam3txda8jUhNne0jXRKfgiY2t2Q77bbi61zPoIrDSn9YKnZQ0d8Gls Ldo7NV3oF3OWxVz9q2BfckgEfZYfr06BcWmCTFrEN+3xV2LW5b0/Kbqlv2D9WeYaLmtuRX ubOaPAc/fQJpwVctswLyBMRZUeIU7fVg8EQ7rLYHvBgGJTz62PCmn3QYEH6+sv5CQMhpLq LY0m/i+jvuVOZ5O/Gdc35lr8BZhnDsCUGa3SSF0OU7KSJPF6/nrgCgxniUsiKQ== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1772634116; a=rsa-sha256; cv=none; b=vdQOj7bdCMbuEyv/uVukiI4NcFHe2TnaXpMI+VvlCwHDyWl664UzC+3Q8VdGoDEspuEt0c dLcUDdiROWNaCQU2o1+MrvZLdDFwakDcnp8Ugj8epN4zz39VXy1hbXOTVr4wIy5dWDKsSJ CvY5WGI5z8kRR9wQ3uTRkwBlSo47gBSWyeV6qx+i3W9DY6Ttgqu6Ud1JgsURZRPIZZmh+3 lVO1WpHX8spYctJscGAiBhMvs8r7/Dm9nS3z2dANDJUFPD6AiuVojBz/KI5N8+aSe4MGEO nNFGETLZrrloWnNe4y5G1h9uKnB0NglULy6/7QiHfcP5boQ1TtVWxnnOPKFxag== 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=1772634116; 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=MWQLWx+3uVcF4csywmcyMwgL9rfLqj1A8XuHhcWHP6M=; b=C6kfJNYJq4kjzQ+2dt1PpNnx0m3llVAh/RxLwyyn6JBvmxqZIkfNf3ENmsV67bksz+/EOl lWLEZgNE1J58hgVgE9k4WUrVynfIQNTvMIKztYbz7gkhHrYDqqbuLUBJZvrqXiVmPtM1GF zajoy5Znim/gfAqZRVsKzDg+N2IlyhtCRiohd1sggWdCbMo/xfOPhn0Vd5SHZDSYUWJco4 5ROputpUQSPmu86XVTDTrlPJT13bQCMVuLob772mECZbHyThV9JYdmzXahywxAXoDUnVJw dvtNmfDd0n/5MJWM/gPBgI8keH+avWSSq/ZKoD3sr/hPOsI7V5EmT3hXTY97Zw== Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) by mxrelay.nyi.freebsd.org (Postfix) with ESMTP id 4fQvxb6ktWzvTK for ; Wed, 04 Mar 2026 14:21:55 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from git (uid 1279) (envelope-from git@FreeBSD.org) id 227f2 by gitrepo.freebsd.org (DragonFly Mail Agent v0.13+ on gitrepo.freebsd.org); Wed, 04 Mar 2026 14:21:55 +0000 To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: ShengYi Hung Subject: git: 4bac18002ab4 - stable/14 - smp: Use bitwise operation to count cpu number List-Id: Commit messages for all branches of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-all List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-all@freebsd.org Sender: owner-dev-commits-src-all@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/14 X-Git-Reftype: branch X-Git-Commit: 4bac18002ab418131a2c0bc41fba089700f1ba85 Auto-Submitted: auto-generated Date: Wed, 04 Mar 2026 14:21:55 +0000 Message-Id: <69a84003.227f2.335c0e3a@gitrepo.freebsd.org> The branch stable/14 has been updated by aokblast: URL: https://cgit.FreeBSD.org/src/commit/?id=4bac18002ab418131a2c0bc41fba089700f1ba85 commit 4bac18002ab418131a2c0bc41fba089700f1ba85 Author: ShengYi Hung AuthorDate: 2026-01-03 16:32:50 +0000 Commit: ShengYi Hung CommitDate: 2026-03-04 14:21:13 +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 7cbf83928786..d78e65ee0af3 100644 --- a/sys/kern/subr_smp.c +++ b/sys/kern/subr_smp.c @@ -556,7 +556,7 @@ 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) { @@ -577,10 +577,8 @@ 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");