linux-kernel - Re: [PATCH 5/9] PM: suspend

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Message-ID: <p2xa55d774e1004252324i4dca8cc3y1ffacec838c436f8@mail.gmail.com>
Date:	Sun, 25 Apr 2010 23:24:46 -0700
From:	Brian Swetland <swetland@...gle.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	Greg KH <greg@...ah.com>, "Arve Hj?nnev?g" <arve@...roid.com>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Pavel Machek <pavel@....cz>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Len Brown <len.brown@...el.com>
Subject: Re: [PATCH 5/9] PM: suspend_block: Add debugfs file

On Sun, Apr 25, 2010 at 12:53 PM, Randy Dunlap <randy.dunlap@...cle.com> wrote:
> On 04/25/10 11:15, Greg KH wrote:
>> On Fri, Apr 23, 2010 at 01:58:53PM -0700, Randy Dunlap wrote:
>>> On Thu, 22 Apr 2010 18:08:54 -0700 Arve Hj?nnev?g wrote:
>>>
>>>> Report active and inactive suspend blockers in
>>>> /sys/kernel/debug/suspend_blockers.
>>>
>>>
>>> This looks more like user interface information than it does debug information.
>>> If that's correct, it shouldn't be in debugfs.
>>
>> It's debug-like information, and has more than one value per file, so
>> debugfs seems like the proper place for it.  I have no objection to it
>> going there.
>
> I have no objection if it really is debug info, but I'm not convinced
> of that yet.

Our most common use of this information is to capture it in bugreports
(along with process lists, system/radio logs, memory stats, etc) as
one additional piece of data used to diagnose a misbehaving device
(most commonly to answer the "why does the battery seem to be draining
too quickly?" question).

Brian
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