[linux-pm] [PATCH 01/19] freezer: don't get over-anxious while waiting
Tejun Heo
tj at kernel.org
Fri Oct 2 03:56:33 PDT 2009
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
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