linux-kernel - Re: [PATCH] blktrace: Fix potentail deadlock between delete & sysfs ops

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Message-ID: <20170816151446.372fc3d2@gandalf.local.home>
Date:   Wed, 16 Aug 2017 15:14:46 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Jeff Layton <jlayton@...chiereds.net>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] blktrace: Fix potentail deadlock between delete & sysfs
 ops

On Wed, 16 Aug 2017 15:07:25 -0400
Waiman Long <longman@...hat.com> wrote:


> I am thinking about maybe letting a RT task to sleep a tiny amount of
> time instead of calling schedule(). Hopefully, that will allow a
> lower-priority task to make forward progress.

That is actually one of the ugly hacks we have in the PREEMPT_RT patch
(and one of the things we need to fix before getting it to mainline).

A simple msleep(1).

-- Steve