From: Pavel Machek <pavel@ucw.cz>
To: Ganesh Mahendran <opensource.ganesh@gmail.com>
Cc: rjw@rjwysocki.net, len.brown@intel.com,
gregkh@linuxfoundation.org, linux-pm@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] PM / wakeup: use seq_open() to show wakeup stats
Date: Fri, 2 Mar 2018 10:05:46 +0100 [thread overview]
Message-ID: <20180302090546.GB30267@amd> (raw)
In-Reply-To: <1519966860-32519-1-git-send-email-opensource.ganesh@gmail.com>
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On Fri 2018-03-02 13:01:00, Ganesh Mahendran wrote:
> single_open() interface requires that the whole output must
> fit into a single buffer. This will lead to timeout when
> system memory is not in a good situation.
>
> This patch use seq_open() to show wakeup stats. This method
> need only one page, so timeout will not be observed.
Can the rcu_read_unlock be delayed arbitrarily by userland code?
Is that ok with RCU?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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next prev parent reply other threads:[~2018-03-02 9:05 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-02 5:01 [PATCH] PM / wakeup: use seq_open() to show wakeup stats Ganesh Mahendran
2018-03-02 8:58 ` Rafael J. Wysocki
2018-03-02 9:15 ` Rafael J. Wysocki
2018-03-02 11:34 ` Ganesh Mahendran
2018-03-02 11:48 ` Rafael J. Wysocki
2018-03-02 9:05 ` Pavel Machek [this message]
2018-03-02 9:12 ` Rafael J. Wysocki
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