linux-kernel - Re: [PATCH 0/2] trace-vmscan-postprocess: fix parsing and output

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Date:   Wed, 11 Sep 2019 10:30:28 +0000
From:   Florian Schmidt <florian.schmidt@...anix.com>
To:     Daniel Jordan <daniel.m.jordan@...cle.com>
CC:     Jonathan Corbet <corbet@....net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Yafang Shao <laoar.shao@...il.com>
Subject: Re: [PATCH 0/2] trace-vmscan-postprocess: fix parsing and output

Hi Daniel,

On 04/09/2019 21:42, Daniel Jordan wrote:
>> In addition, the tables that are printed by the script were not properly
>> aligned any more, so patch 2 fixes the spacing.
> 
> Nit, not for Pages Scanned.  With your series I get
> 
> Kswapd          Kswapd      Order      Pages     Pages    Pages    Pages
> Instance       Wakeups  Re-wakeup    Scanned    Rclmed  Sync-IO ASync-IO
> kswapd0-175          1          0    253694     253691        3   129896               wake-0=1

Whoops, you're right, I'll fix that in v2.


> I wonder if we shouldn't just get rid of the whole script, it's hard to
> remember to keep in sync with vmscan changes and I can't think of a way to
> remedy that short of having mm regression tests that run this.  But your
> patches are an improvement for now.

That's definitely one possibility. If history has shown that these break 
and aren't properly kept in line, they could go. Alternatively, as 
Yafang suggested, integrating them into the perf test suite might help 
with the issues.

I'll ignore that point for now though and just send a v2 for this patch 
series.

Thanks for the feedback,
Florian