From: Pavel Machek <pavel@ucw.cz>
To: Len Brown <lenb@kernel.org>
Cc: rjw@rjwysocki.net, linux-pm@vger.kernel.org,
linux-kernel@vger.kernel.org, Len Brown <len.brown@intel.com>
Subject: Re: [PATCH 1/1] suspend: make sync() on suspend-to-RAM optional
Date: Wed, 15 Jul 2015 08:43:21 +0200 [thread overview]
Message-ID: <20150715064320.GA23713@amd> (raw)
In-Reply-To: <505338dbbcdce9416ac05f67288b10442fbda179.1436926113.git.len.brown@intel.com>
On Tue 2015-07-14 22:24:51, Len Brown wrote:
> From: Len Brown <len.brown@intel.com>
>
> The Linux kernel suspend path has traditionally invoked sys_sync().
>
> But sys_sync() can be expensive, and some systems do not want
> to pay the cost of sys_sync() on every suspend.
Have you measured how expesive it can be, and why it is expensive?
> So make sys_sync on suspend optional.
>
> Create sysfs attribute /sys/power/pm_suspend_do_sync.
> When set to 1, the kernel will sys_sync() on suspend,
> When set to 0, it will not.
>
> This attribute can be changed by root at run-time.
> Kernel build parameter CONFIG_PM_SUSPEND_DO_SYNC_DEFAULT.
> As this is 1, by default, this patch does not change
> default behavior.
Why do you need CONFIG parameter?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2015-07-15 6:43 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-15 2:24 [PATCH v4 0/1] suspend: make sync() on suspend-to-RAM optional Len Brown
2015-07-15 2:24 ` [PATCH 1/1] " Len Brown
2015-07-15 6:43 ` Pavel Machek [this message]
2015-07-15 14:06 ` Austin S Hemmelgarn
2015-07-15 14:58 ` Brown, Len
2015-07-17 23:54 ` Rafael J. Wysocki
2015-07-21 9:38 ` Pavel Machek
2015-07-21 14:41 ` Rafael J. Wysocki
2015-07-21 15:19 ` Pavel Machek
2015-07-21 15:36 ` Austin S Hemmelgarn
2015-07-21 20:11 ` Pavel Machek
2015-07-21 20:01 ` Brown, Len
2015-07-21 20:05 ` Pavel Machek
2015-07-22 1:25 ` Rafael J. Wysocki
2015-07-22 7:23 ` Pavel Machek
2015-07-22 8:55 ` Oliver Neukum
2015-07-31 16:02 ` Len Brown
2015-07-31 23:56 ` Rafael J. Wysocki
2015-10-08 15:50 ` Pavel Machek
-- strict thread matches above, loose matches on Subject: below --
2014-01-23 7:11 Len Brown
2014-01-23 7:29 ` Zhang Rui
2014-01-23 7:41 ` Brown, Len
2014-01-23 7:41 ` Brown, Len
2014-01-23 7:38 ` Srivatsa S. Bhat
2014-01-23 7:59 ` Brown, Len
2014-01-26 21:08 ` Pavel Machek
2015-05-08 6:41 ` Len Brown
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