linux-kernel - Re: [PATCH 0/7 v2] vm, vmscan: enahance vmscan tracepoints

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Date:   Thu, 5 Jan 2017 09:25:07 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Mel Gorman <mgorman@...e.de>, Johannes Weiner <hannes@...xchg.org>,
        Minchan Kim <minchan@...nel.org>,
        Hillf Danton <hillf.zj@...baba-inc.com>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/7 v2] vm, vmscan: enahance vmscan tracepoints

On 01/04/2017 11:19 AM, Michal Hocko wrote:
> Hi,
> this is the second version of the patchset [1]. I hope I've addressed all
> the review feedback.
> 
> While debugging [2] I've realized that there is some room for
> improvements in the tracepoints set we offer currently. I had hard times
> to make any conclusion from the existing ones. The resulting problem
> turned out to be active list aging [3] and we are missing at least two
> tracepoints to debug such a problem.
> 
> Some existing tracepoints could export more information to see _why_ the
> reclaim progress cannot be made not only _how much_ we could reclaim.
> The later could be seen quite reasonably from the vmstat counters
> already. It can be argued that we are showing too many implementation
> details in those tracepoints but I consider them way too lowlevel
> already to be usable by any kernel independent userspace. I would be
> _really_ surprised if anything but debugging tools have used them.
> 
> Any feedback is highly appreciated.

When patch-specific feedback is addressed, then for the whole series:

Acked-by: Vlastimil Babka <vbabka@...e.cz>

> [1] http://lkml.kernel.org/r/20161228153032.10821-1-mhocko@kernel.org
> [2] http://lkml.kernel.org/r/20161215225702.GA27944@boerne.fritz.box
> [3] http://lkml.kernel.org/r/20161223105157.GB23109@dhcp22.suse.cz
> 
>