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=0.6 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 88C08C3A5A0 for ; Mon, 19 Aug 2019 19:09:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5AE0B2087E for ; Mon, 19 Aug 2019 19:09:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1566241779; bh=o7tVJ6A0EFYrGOmxiCVqJd1Rms6vZpxqerY1m9I++AE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=XqILMWM+jlA5mHhgeXl5Ypj8XK14nac3zEDa16kJKqrJv0wE5ul/XJcRrvurk92I/ JMUqsHh1v2euxM9qylTfr2J+HzxpQfqpO8W9rcYHNPFpjaeuQX+6TOkPT76JadJaR3 BLqDHxi4SUGSyo0cNCEzoQl1GWOMcKj8JSWY5ykw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728374AbfHSTJi (ORCPT ); Mon, 19 Aug 2019 15:09:38 -0400 Received: from mail-wr1-f48.google.com ([209.85.221.48]:41620 "EHLO mail-wr1-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728202AbfHSTJh (ORCPT ); Mon, 19 Aug 2019 15:09:37 -0400 Received: by mail-wr1-f48.google.com with SMTP id j16so9825350wrr.8 for ; Mon, 19 Aug 2019 12:09:36 -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=eqMhxBvQwya5TIVbKXUGGJGWLWVFO7AHliC0/UBpCtc=; b=UJD/sHRf30MtIsBs6GhLqK/i3ozJbg3JDELAXco4LWG7K3zjY0IYbUaOW5GX3WsFeH n60BO1cgeVqhDOuo8IBV0093gl/NhJz2LW7v32WJDfpe2n4LdmLdHVGtweuegCZKYj+l flX6pnBjB60T8Va51JzEgwb5tIUDdxNAarYvsPELuZjPFrMLnyFhQCcpoHcxxQy07EI6 LM002Wrf9WZ/Y9qbDQRABFOIMpoPWUE5POXlKeZVxldzEp/mvj77gUzPryWiTWiFoDbC hhFSDfF9RNbrSpOz1wGDIFWpx45LpoHORC8Gf/C8EaCJqFVaHns8JyDPcItdxmCLveXf m4zA== 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=eqMhxBvQwya5TIVbKXUGGJGWLWVFO7AHliC0/UBpCtc=; b=SL2t2U6jgTaOv7LdXED7fXdc5cFtLrWQPO9f+napbAXeBl0JnZN9vqNbwYoVJc3ilK h4W5C7XPU7EsphZwBwlby5OtEg11e+wOBWyYSlhZWPVB3jotSqTD3OmFZ2Utb4XFACuy e30BwPj5Yjxb/ZGjcUJZqhPUFXEKO7SGWI6RYwvUNFlOuSmw9phUJjGb7gm+yefW/Qit P9T3wTdc6Umvsp3M8U2XpkOC07zGfDcduNLvF9WxcB5/lMbdrKKl2HyjV4HmnLUzX4K2 IC2x2aRRcOkY1FrLwSdqaKLDFLcnMMne7hzMmKRWiJ/2d1quQCAoaJBkh6avJbSUGhLM T/QA== X-Gm-Message-State: APjAAAWh3LMHcw4IpAh+mhxwu2KRUcDmz8T2ctsPyYnE5K3rpUw1SjiP O4/mPm3hFY3snxr+AUwhhGg= X-Google-Smtp-Source: APXvYqxRajgdFnowJC+Nv6c8bmW5f3GiFXy7dBrKTUjK6e1t9HgZfaAdj21VJFad6lh6b7F3FQwNeQ== X-Received: by 2002:adf:de8e:: with SMTP id w14mr29136969wrl.79.1566241775816; Mon, 19 Aug 2019 12:09:35 -0700 (PDT) Received: from gmail.com (2E8B0CD5.catv.pool.telekom.hu. [46.139.12.213]) by smtp.gmail.com with ESMTPSA id e9sm14410971wrt.69.2019.08.19.12.09.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Aug 2019 12:09:35 -0700 (PDT) Date: Mon, 19 Aug 2019 21:09:33 +0200 From: Ingo Molnar To: Thomas Gleixner Cc: LKML , Oleg Nesterov , Peter Zijlstra , John Stultz , Frederic Weisbecker , Anna-Maria Behnsen Subject: Re: [patch 44/44] posix-cpu-timers: Expire timers directly Message-ID: <20190819190933.GB68079@gmail.com> References: <20190819143141.221906747@linutronix.de> <20190819143805.605704599@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190819143805.605704599@linutronix.de> 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 * Thomas Gleixner wrote: > Moving the posix cpu timers from on list to another and then expiring them > from the second list is avoiding to drop and reacquire sighand lock for > each timer expiry, but on the other hand it's more complicated code and > suboptimal for a small number of timers. s/on list /one list s/cpu timers /CPU timers Thanks, Ingo