[linux-pm] [PATCH 01/19] freezer: don't get over-anxious while waiting

[Tejun Heo]

Hello, Pavel, Rafael.

Rafael J. Wysocki wrote:
> On Thursday 01 October 2009, Pavel Machek wrote:
>>> Freezing isn't exactly the most latency sensitive operation and
>>> there's no reason to burn cpu cycles and power waiting for it to
>>> complete.  msleep(10) instead of yield().  This should improve
>>> reliability of emergency hibernation.
>> i don't see how it improves reliability, but its probably ok.

It's about battery.  When emergency hibernation kicks in and something
is taking a while to freeze (usually nfs does this for me) burning
power waiting for it to finish is a pretty bad idea.

>> Well... for hibernation anyway. I can imagine cgroup users where
>> freeze is so fast that this matters. rjw cc-ed.		pavel
> 
> Thanks.  I'd like to hear from the cgroup freezer people about that.

Oh... didn't know that.  10ms sleeps really matter there?

-- 
tejun