linux-kernel - Re: [PATCH 1/2] sched/wait: Break up long wake list walk

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Message-ID: <20170815224728.GA1373@linux-80c1.suse>
Date:   Tue, 15 Aug 2017 15:47:28 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...e.hu>, Kan Liang <kan.liang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>, Jan Kara <jack@...e.cz>,
        linux-mm <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] sched/wait: Break up long wake list walk

On Mon, 14 Aug 2017, Linus Torvalds wrote:

>On Mon, Aug 14, 2017 at 8:15 PM, Andi Kleen <ak@...ux.intel.com> wrote:
>> But what should we do when some other (non page) wait queue runs into the
>> same problem?
>
>Hopefully the same: root-cause it.

Or you can always use wake_qs; which exists _exactly_ for the issues you
are running into. Note that Linus does not want them in general wait:

https://lkml.org/lkml/2017/7/7/605

... but you can always use them on your own if you really need to (ie locks,
ipc, etc).

Thanks,
Davidlohr