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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 66580C63697 for ; Mon, 23 Nov 2020 21:49:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0B85820721 for ; Mon, 23 Nov 2020 21:49:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="PxgsNoRM"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="ieiCQJI+" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731985AbgKWVtU (ORCPT ); Mon, 23 Nov 2020 16:49:20 -0500 Received: from Galois.linutronix.de ([193.142.43.55]:38586 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726019AbgKWVtT (ORCPT ); Mon, 23 Nov 2020 16:49:19 -0500 From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1606168157; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=VWoabT64+bllfkSbYbuvYXig8GKR3JUjvD1l7ZSAJwA=; b=PxgsNoRMH0Rr40VpLK8D0PqVJ9cHiuyB2SsXzszyFbnoizn58KGi+0mK/WB+PboPf/X+/7 BhFlCNONiTSk90MBVfZEMOTUwdAojjEu1i+kigRRy8HSZ7RPWvPEXumE+ktFeDn6jOkPlj x8c7UfVbC/8oDEEHkLHJ3YxIjjunA8Um7Hbz3hLwam3fgcHdv8RAiQ3AlHdLgZbHG1FnO1 6vBA8xxRONKWYZ7HCwlk2y6J6vrwZ2q4TXyruQ1qHo9VMCusWXYHjzNJmK9G2kzUngpZew n3RqR3zLeaaZdYWevvQ5zxv0c6x8Tv8O5PYMXtVUWrBxhFZCYFdqRkgoQiBk4w== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1606168157; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=VWoabT64+bllfkSbYbuvYXig8GKR3JUjvD1l7ZSAJwA=; b=ieiCQJI+UzpNGa8RZqgGRzoedOkaUxVXJKdL7QdFPi4aTYRb1pLu8vBwVEUPqSm5p5F4mW Tp16jMSfqR6mIGBw== To: Alex Belits , "nitesh\@redhat.com" , "frederic\@kernel.org" Cc: Prasun Kapoor , "linux-api\@vger.kernel.org" , "davem\@davemloft.net" , "trix\@redhat.com" , "mingo\@kernel.org" , "catalin.marinas\@arm.com" , "rostedt\@goodmis.org" , "linux-kernel\@vger.kernel.org" , "peterx\@redhat.com" , "linux-arch\@vger.kernel.org" , "mtosatti\@redhat.com" , "will\@kernel.org" , "peterz\@infradead.org" , "leon\@sidebranch.com" , "linux-arm-kernel\@lists.infradead.org" , "pauld\@redhat.com" , "netdev\@vger.kernel.org" Subject: Re: [PATCH v5 2/9] task_isolation: vmstat: add vmstat_idle function In-Reply-To: <6ac7143e5038614e3950636456cef67b5bc0c9e4.camel@marvell.com> References: <8d887e59ca713726f4fcb25a316e1e932b02823e.camel@marvell.com> <6ac7143e5038614e3950636456cef67b5bc0c9e4.camel@marvell.com> Date: Mon, 23 Nov 2020 22:49:17 +0100 Message-ID: <87blfnn3qa.fsf@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Nov 23 2020 at 17:56, Alex Belits wrote: > This function checks to see if a vmstat worker is not running, > and the vmstat diffs don't require an update. The function is > called from the task-isolation code to see if we need to > actually do some work to quiet vmstat. A changelog has to explain _WHY_ this change is necessary and not _WHAT_ the patch is doing. Thanks, tglx