From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FSL_HELO_FAKE,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C70E4ECE58E for ; Mon, 7 Oct 2019 16:20:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9D34820673 for ; Mon, 7 Oct 2019 16:20:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570465238; bh=k8bWCaLv3Ck5619zahS0wFoXqqRWueQQozvCIHASccE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=K8HwAUwchxL8AYf8Isb79CqMzbzzZD+s6epNEGHF59E2ShJM0Zl/Ln/Gq9l94JA/S f3MBzkLGr19IEE8i8Qv7rQKEGNE9N7byPtutn6wX82cJozvaZYG13/kug8nSqoi3F6 lXcdNpuTKj1cYeFFFlEyJcrxsw7iFsVtmhwkHypw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728893AbfJGQUg (ORCPT ); Mon, 7 Oct 2019 12:20:36 -0400 Received: from mail-wr1-f68.google.com ([209.85.221.68]:37127 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728306AbfJGQUg (ORCPT ); Mon, 7 Oct 2019 12:20:36 -0400 Received: by mail-wr1-f68.google.com with SMTP id p14so15121278wro.4 for ; Mon, 07 Oct 2019 09:20:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=Ri8vm/ezKRwl75wbz/HtUEr3mN+iWcsdAOxE2zd9lHk=; b=WXyI0aW3CwE7lqT5tFsUTIugOYQHUXQ+vQRCRFNRRaPPgIh+acnw6gKmC9jsBTk8dV xPJIvztdT9NHJ8s9C+rCiWDJyalwKUt2s3TJOLWblAYXTgLbtBTQsl2NrB1DWJG1Ux+D +dN14ONSTKK0psQLym7IbNZK4ee20whqIZjmBE4oEjelxJzCC00cY4k8msPiNMBYw/1x HXflbePn80on+pYk7FD0Wn0qeouyaxrltMPMWUCj9LVTTxJ0Yvh0T+oJLW+bzY9TwkOi gjvtlw4FQuTV4xHSWfJAdHg/+BRfJNy6kzYd7n8yDzGDHr9P8IXmOBy1Pa933kgtQm9l i9Mg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to:user-agent; bh=Ri8vm/ezKRwl75wbz/HtUEr3mN+iWcsdAOxE2zd9lHk=; b=An0DyzY7kqHKWwTkv7lqal1pTk7oTdkHHOswMdVRndzSu0DgxiIjxBzShNKoUl2CcP B2K7TXrIAdeK3YYDmJ9ZLtOk1dFrPGo1U0IX0lxisYUj2zS2Tv5Pl+e21eCVVkezPv0K lRVBxZNgAStpPbGOmywBdT4+9pXnBix7keBZgTOLYZnh5i768le2gplxi73+9oAf7v46 CIngPtY/FHeGb5PVV4J+L8z+rZf7zoP+nz4bpWWfpsb0h0/G2fYcSpJ5iv+Pgi0YlafF Y+vk9ijYUyth5kzz3al0IoMAmtkcwNZkmz3TgSSWujisuHbk5SGBbBhnOTDhtYuhre0o gfkw== X-Gm-Message-State: APjAAAVAq5ZyVlilW2PBF4EvWSEYPtPTRh3EGdOQQzZToJCJBemzSXf/ nV8xz/mXuA3Nsu4fjw9bFbCJgVCk X-Google-Smtp-Source: APXvYqwtO3UT2MrnRVuLaGSAfB8Gj0CM9mX0HD+I1pm9FrENgbC5spDPfCMGm6TsL822aawUTxpY0Q== X-Received: by 2002:adf:ec91:: with SMTP id z17mr24448592wrn.346.1570465234474; Mon, 07 Oct 2019 09:20:34 -0700 (PDT) Received: from gmail.com (2E8B0CD5.catv.pool.telekom.hu. [46.139.12.213]) by smtp.gmail.com with ESMTPSA id g1sm15825119wrv.68.2019.10.07.09.20.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Oct 2019 09:20:33 -0700 (PDT) Date: Mon, 7 Oct 2019 18:20:31 +0200 From: Ingo Molnar To: Frederic Weisbecker Cc: Peter Zijlstra , LKML , Wanpeng Li , Thomas Gleixner , Yauheni Kaliuta , Rik van Riel Subject: Re: [PATCH 0/2] vtime: Remove pair of seqcount on context switch Message-ID: <20191007162031.GA7676@gmail.com> References: <20191003161745.28464-1-frederic@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191003161745.28464-1-frederic@kernel.org> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Frederic Weisbecker wrote: > Extracted from a larger queue that fixes kcpustat on nohz_full, these > two patches have value on their own as they remove two write barriers > on nohz_full context switch. > > Frederic Weisbecker (2): > vtime: Rename vtime_account_system() to vtime_account_kernel() > vtime: Spare a seqcount lock/unlock cycle on context switch > > arch/ia64/kernel/time.c | 4 +-- > arch/powerpc/kernel/time.c | 6 ++-- > arch/s390/kernel/vtime.c | 4 +-- > include/linux/context_tracking.h | 4 +-- > include/linux/vtime.h | 38 ++++++++++++------------ > kernel/sched/cputime.c | 50 ++++++++++++++++++-------------- > 6 files changed, 57 insertions(+), 49 deletions(-) Which tree is this against? Doesn't apply cleanly to v5.4-rc2 nor v5.3. Does it have any prereqs perhaps? Thanks, Ingo