linux-kernel - Re: [RFC PATCH 2/5] numa: append per-node execution info in memory.numa

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Message-ID: <20190423085248.GE11158@hirez.programming.kicks-ass.net>
Date:   Tue, 23 Apr 2019 10:52:48 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     王贇 <yun.wang@...ux.alibaba.com>
Cc:     hannes@...xchg.org, mhocko@...nel.org, vdavydov.dev@...il.com,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [RFC PATCH 2/5] numa: append per-node execution info in
 memory.numa_stat

On Mon, Apr 22, 2019 at 10:12:20AM +0800, 王贇 wrote:
> This patch introduced numa execution information, to imply the numa
> efficiency.
> 
> By doing 'cat /sys/fs/cgroup/memory/CGROUP_PATH/memory.numa_stat', we
> see new output line heading with 'exectime', like:
> 
>   exectime 24399843 27865444
> 
> which means the tasks of this cgroup executed 24399843 ticks on node 0,
> and 27865444 ticks on node 1.

I think we stopped reporting time in HZ to userspace a long long time
ago. Please don't do that.