linux-kernel - Re: [PATCH 3/3] sched/numa: Fix numabalancing stats in /proc/pid/sched

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Date:	Thu, 25 Jun 2015 13:40:21 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
CC:	linux-kernel@...r.kernel.org, Mel Gorman <mgorman@...e.de>,
	Iulia Manda <iulia.manda21@...il.com>
Subject: Re: [PATCH 3/3] sched/numa: Fix numabalancing stats in /proc/pid/sched

On 06/25/2015 01:21 PM, Srikar Dronamraju wrote:
> Commit 44dba3d5d6a1 (sched: Refactor task_struct to use numa_faults
> instead of numa_* pointers) modified the way tsk->numa_faults stats are
> accounted. However that commit never touched show_numa_stats() that
> displays /proc/pid/sched. Now the numbers displayed in /proc/pid/sched
> dont match the actual numbers.
> 
> Fix it by making sure that /proc/pid/sched reflects the task fault numbers
> Also add group fault stats too.
> 
> Also couple of more modifications are added here.
> 1. Format change.
> - Previously we would list two entries per node, one for private and one for
>   shared. Also the home node info was listed in each entry.
> 
> - Now preferred node, total_faults and current node are displayed separately.
> - Now there is one entry per node, that lists private,shared task and group
>   faults.
> 
> 2. p->numa_pages_migrated was getting reset after every read of
>    /proc/pid/sched. Its more useful to have absolute numbers since
>    differential migrations between two accesses can be easily calculated.
> 
> Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>

Acked-by: Rik van Riel <riel@...hat.com>


Thank you for updating the statistics to match what
the code does nowadays.

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