Received: by 2002:a05:6a10:f347:0:0:0:0 with SMTP id d7csp1182362pxu;
        Mon, 23 Nov 2020 13:54:25 -0800 (PST)
X-Google-Smtp-Source: ABdhPJz3SEnBNF3ZcoQB/HMNO2BtgMSRlgo4RqeglnYCDS+GQlRY9xSDDoQNeSrzQtm2X6nhfH0+
X-Received: by 2002:a17:906:dc49:: with SMTP id yz9mr1400215ejb.499.1606168465111;
        Mon, 23 Nov 2020 13:54:25 -0800 (PST)
ARC-Seal: i=1; a=rsa-sha256; t=1606168465; cv=none;
        d=google.com; s=arc-20160816;
        b=hP2065hHg6KmhQ6y+cbo228ourwW1CgAOvkoCPmYghO0LLAPoA52j0Y+xwfB9cnhFi
         NV+UucSSqOK+zvdwa7ikUXy48DGUvfPXj/+kYyVKHr42xG9U7WXJdHhwFEBOIEdR5CBt
         vEX2AsUcgkEHW72w3933+lwlqAWVN5+p4qBM4VjxuqNVP8joUCnJ6dqLe4djJusOAO9Q
         Qjp0KSF4AfbxG+H8W/2SoF2mklbeNhzPbMzxp57Y9piI08oVEoFJdtxcBEVUvLh5lR5g
         FMwR4tHtGeUJUn4j8MoZNUWlpkDtOyRtYx2qLQpBMvy8F5zBbBX4gC463a32rho9XQe8
         Howw==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
        h=list-id:precedence:mime-version:message-id:date:references
         :in-reply-to:subject:cc:to:dkim-signature:dkim-signature:from;
        bh=VWoabT64+bllfkSbYbuvYXig8GKR3JUjvD1l7ZSAJwA=;
        b=mOkt2FQSvKD9guvt7JrcDEJMv/SvTDc7UAzD4+oXeAN0wAlnKjFExN9eJg35SvGRCO
         kZtgTQq8GgS5F8u5UBTM7IJQFprNWYt8QonQEMoQA+AE+QKFKEd9/5oPsJcULyrlCvRg
         VcAfB2gl9IQeiXgfN9WoaJgXFX3YsPIzXHFluB0bzo/1GNLbYBb7BktNrkDNDsgGf39k
         nsuNi6OvCVDrGTc1WrJW51h87nVrMaBjeAM02O4mm1fpyupOc8m4GetSpe8MDnFSoTDA
         2Eq1260dI8df1gpLnWfvySbQjKXeqC0mTlYriaN2KQFtiF+zV5ZsV9Zva8L7GIKAeFMI
         Lr5Q==
ARC-Authentication-Results: i=1; mx.google.com;
       dkim=pass header.i=@linutronix.de header.s=2020 header.b=PxgsNoRM;
       dkim=neutral (no key) header.i=@linutronix.de;
       spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org;
       dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=linutronix.de
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18])
        by mx.google.com with ESMTP id o10si7237230ejg.80.2020.11.23.13.54.02;
        Mon, 23 Nov 2020 13:54:25 -0800 (PST)
Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Authentication-Results: mx.google.com;
       dkim=pass header.i=@linutronix.de header.s=2020 header.b=PxgsNoRM;
       dkim=neutral (no key) header.i=@linutronix.de;
       spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org;
       dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=linutronix.de
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1731909AbgKWVtU (ORCPT <rfc822;thunderbird.krnldev@gmail.com>
        + 99 others); 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
        <rfc822;linux-kernel@vger.kernel.org>);
        Mon, 23 Nov 2020 16:49:19 -0500
From:   Thomas Gleixner <tglx@linutronix.de>
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 <abelits@marvell.com>,
        "nitesh\@redhat.com" <nitesh@redhat.com>,
        "frederic\@kernel.org" <frederic@kernel.org>
Cc:     Prasun Kapoor <pkapoor@marvell.com>,
        "linux-api\@vger.kernel.org" <linux-api@vger.kernel.org>,
        "davem\@davemloft.net" <davem@davemloft.net>,
        "trix\@redhat.com" <trix@redhat.com>,
        "mingo\@kernel.org" <mingo@kernel.org>,
        "catalin.marinas\@arm.com" <catalin.marinas@arm.com>,
        "rostedt\@goodmis.org" <rostedt@goodmis.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "peterx\@redhat.com" <peterx@redhat.com>,
        "linux-arch\@vger.kernel.org" <linux-arch@vger.kernel.org>,
        "mtosatti\@redhat.com" <mtosatti@redhat.com>,
        "will\@kernel.org" <will@kernel.org>,
        "peterz\@infradead.org" <peterz@infradead.org>,
        "leon\@sidebranch.com" <leon@sidebranch.com>,
        "linux-arm-kernel\@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        "pauld\@redhat.com" <pauld@redhat.com>,
        "netdev\@vger.kernel.org" <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: <linux-kernel.vger.kernel.org>
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