linux-kernel - Re: freezer problems

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Message-Id: <200702190019.23215.rjw@sisk.pl>
Date:	Mon, 19 Feb 2007 00:19:21 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	ego@...ibm.com, akpm@...l.org, paulmck@...ibm.com, mingo@...e.hu,
	vatsa@...ibm.com, dipankar@...ibm.com,
	venkatesh.pallipadi@...el.com, linux-kernel@...r.kernel.org,
	Pavel Machek <pavel@....cz>
Subject: Re: freezer problems

On Sunday, 18 February 2007 23:01, Oleg Nesterov wrote:
> On 02/18, Rafael J. Wysocki wrote:
> > 
> > Appended is a patch that does something along these lines.  The necessary
> > thread_info flags are defined for i386 and x86_64, for now.
> 
> I'll try to look at this patch when I am not sooooo sleepy ...
> 
> just one small nit right now,
> 
> > --- linux-2.6.20-mm2.orig/include/asm-i386/thread_info.h	2007-02-18 19:49:34.000000000 +0100
> > +++ linux-2.6.20-mm2/include/asm-i386/thread_info.h	2007-02-18 19:50:37.000000000 +0100
> > @@ -135,6 +135,7 @@ static inline struct thread_info *curren
> >  #define TIF_IO_BITMAP		18	/* uses I/O bitmap */
> >  #define TIF_FREEZE		19	/* is freezing for suspend */
> >  #define TIF_FORCED_TF		20	/* true if TF in eflags artificially */
> > +#define TIF_FREEZER_SKIP	21	/* task freezer should not count us */
> 
> Do we need to put this flag into thread_info? It is always modified by
> "current", so it could live in task_struct->flags instead.

I thought we were running low on the task_struct->flags bits. :-)

Apart from this, we may need to set it from somewhere else in the future.

Greetings,
Rafael
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