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Message-ID: <20160812062241.GB30992@amd> Date: Fri, 12 Aug 2016 08:22:41 +0200 From: Pavel Machek <pavel@....cz> To: Chen Yu <yu.c.chen@...el.com> Cc: Linux PM List <linux-pm@...r.kernel.org>, "Rafael J. Wysocki" <rjw@...ysocki.net>, Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org Subject: Re: [PATCH][RFC] Documentation/: update hibernation debug documentation Hi! > Update the description of test_resume mode for hibernation. > > Signed-off-by: Chen Yu <yu.c.chen@...el.com> > --- > Documentation/power/basic-pm-debugging.txt | 7 +++++++ > 1 file changed, 7 insertions(+) That's certainly step in the right direction, but I guess it should be mentioned in the other places, too. Something like this? Additionally, we have testproc. Should we move it to test_proc for consistency (or replace test_resume with simple "resume"? That's what it does... it is hibernate+resume... Thanks, Pavel diff --git a/Documentation/power/interface.txt b/Documentation/power/interface.txt index f1f0f59a..d4ac8f7 100644 --- a/Documentation/power/interface.txt +++ b/Documentation/power/interface.txt @@ -23,8 +23,8 @@ few options for putting the system to sleep - using the platform driver (e.g. ACPI or other suspend_ops), powering off the system or rebooting the system (for testing). -Additionally, /sys/power/disk can be used to turn on one of the two testing -modes of the suspend-to-disk mechanism: 'testproc' or 'test'. If the +Additionally, /sys/power/disk can be used to turn on one of the three testing +modes of the suspend-to-disk mechanism: 'test_resume', 'testproc' or 'test'. If the suspend-to-disk mechanism is in the 'testproc' mode, writing 'disk' to /sys/power/state will cause the kernel to disable nonboot CPUs and freeze tasks, wait for 5 seconds, unfreeze tasks and enable nonboot CPUs. If it is @@ -32,12 +32,13 @@ in the 'test' mode, writing 'disk' to /sys/power/state will cause the kernel to disable nonboot CPUs and freeze tasks, shrink memory, suspend devices, wait for 5 seconds, resume devices, unfreeze tasks and enable nonboot CPUs. Then, we are able to look in the log messages and work out, for example, which code -is being slow and which device drivers are misbehaving. +is being slow and which device drivers are misbehaving. In 'test_resume' mode, +... (insert your description here). Reading from this file will display all supported modes and the currently selected one in brackets, for example - [shutdown] reboot test testproc + [shutdown] reboot test testproc test_resume Writing to this file will accept one of > diff --git a/Documentation/power/basic-pm-debugging.txt b/Documentation/power/basic-pm-debugging.txt > index b96098c..5f1f228 100644 > --- a/Documentation/power/basic-pm-debugging.txt > +++ b/Documentation/power/basic-pm-debugging.txt > @@ -36,6 +36,13 @@ button to make the system resume). > If neither "platform" nor "shutdown" hibernation mode works, you will need to > identify what goes wrong. > > +Besides, if all the modes described above work, "test_resume" mode can be used to > +verify if the snapshot data written to swap device can be successfully restored > +to memory: > +# echo test_resume > /sys/power/disk > +# echo disk > /sys/power/state > +If everything goes well, the system will resume back without BIOSes involved in. > + > a) Test modes of hibernation > > To find out why hibernation fails on your system, you can use a special testing -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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