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

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Message-ID: <9e4fa528-8537-0864-d661-62d7e33c5359@redhat.com>
Date:   Wed, 16 Aug 2017 15:26:53 -0400
From:   Waiman Long <longman@...hat.com>
To:     Steven Rostedt <rostedt@...dmis.org>
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 08/16/2017 03:14 PM, Steven Rostedt wrote:
> 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


I am planning to use usleep_range(). That will allow a short sleep in
the us range instead of ms. The documentation suggest that for a
10us-20ms sleep.

Cheers,
Longman