linux-kernel - Re: [PATCH v2] scheduler: enhancement to show_state

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Date:   Tue, 8 Aug 2017 10:30:53 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Yafang Shao <laoar.shao@...il.com>
Cc:     gregkh@...uxfoundation.org, jslaby@...e.com, mingo@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] scheduler: enhancement to show_state_filter

On Tue, Aug 08, 2017 at 08:53:10PM +0800, Yafang Shao wrote:
> Sometimes we want to get tasks in TASK_RUNNING sepcifically,
> instead of dump all tasks.
> For example, when the loadavg are high, we want to dump
> tasks in TASK_RUNNING and TASK_UNINTERRUPTIBLE, which contribute
> to system load. But mostly there're lots of tasks in Sleep state,
> which occupies almost all of the kernel log buffer, even overflows
> it, that causes the useful messages get lost. Although we can
> enlarge the kernel log buffer, but that's not a good idea.
> 
> So I made this change to make the show_state_filter more flexible,
> and then we can dump the tasks in TASK_RUNNING specifically.

It reads like magic and I really don't see the point.