linux-kernel - Re: [PATCH] mm/vmstat: Reduce zone lock hold time when reading /proc/pagetypeinfo

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Message-Id: <15BA6C88-21C1-4BF3-BB10-2A207AEBB401@lca.pw>
Date:   Thu, 24 Oct 2019 00:34:41 -0400
From:   Qian Cai <cai@....pw>
To:     Feng Tang <feng.tang@...el.com>
Cc:     Waiman Long <longman@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>, Roman Gushchin <guro@...com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Jann Horn <jannh@...gle.com>, Song Liu <songliubraving@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rafael Aquini <aquini@...hat.com>
Subject: Re: [PATCH] mm/vmstat: Reduce zone lock hold time when reading /proc/pagetypeinfo



> On Oct 23, 2019, at 11:33 PM, Feng Tang <feng.tang@...el.com> wrote:
> 
> We have been using the /proc/pagetypeinfo for debugging, mainly for
> client platforms like phones/tablets. We met problems like very slow
> system response or OOM things, and many of them could be related with
> memory pressure or fragmentation issues, where monitoring /proc/pagetypeinfo
> will be very useful for debugging.

This description of use case is rather vague. Which part of the information in that file is critical to debug an OOM or slow system that is not readily available in places like /proc/zoneinfo, /proc/buddyinfo, sysrq-m, or OOM trace etc?