linux-kernel - Re: Question about PF

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Message-Id: <200708101719.27558.rjw@sisk.pl>
Date:	Fri, 10 Aug 2007 17:19:27 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"jidong xiao" <jidong.xiao@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Question about PF_NOFREEZE

On Friday, 10 August 2007 07:19, jidong xiao wrote:
> if one thread set its current->flag with PF_NOFREEZE, then it means
> this thread is unfreezable,does this mean, when the system entered
> into a suspended state, even though all the other threads have already
> gone sleep, this thread still keeps awaken?

It will be able to run when all freezable threads are frozen.

> One thing I am very confused is, if all the other threads goes to
> sleep,can this only one thread(assume only one thread marked itself as
> unfreezable.) still works well?

The question is rather theoretical, because there are some unfreezable threads
in the system.  In theory, such a thread can work well as long as it doesn't
need to wait for another thread that is frozen.

Greetings,
Rafael

-- 
"Premature optimization is the root of all evil." - Donald Knuth
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