linux-kernel - Re: [RFC PATCH] hrtimer: removing all ur callback modes

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Message-ID: <495AA4BB.8020903@hartkopp.net>
Date:	Tue, 30 Dec 2008 23:46:19 +0100
From:	Oliver Hartkopp <oliver@...tkopp.net>
To:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [RFC PATCH] hrtimer: removing all ur callback modes

Ingo Molnar wrote:
> * Peter Zijlstra <peterz@...radead.org> wrote:
>
>   
>>> ps. What is the intended release for this hrtimer cleanup? 2.6.29?
>>>       
>> I think so, Thomas, Ingo?
>>     
>
> yes, 2.6.29.
>
> 	Ingo
>   

AFAICS the commit ca109491f612aab5c8152207631c0444f63da97f

"hrtimer: removing all ur callback modes" with "Impact: cleanup, move 
all hrtimer processing into hardirq context"

did not find it's way into linux-2.6.git - is there any reason for this?

I reworked some of my code in net/can/bcm.c so that it uses tasklets in 
the cases i needed the soft-irq context and therefore it can cope with 
the hrtimers running always in hard-irq context now.

I'll send a patch to Dave the next days after some more testing on your 
latest sched-devel -tip tree. It works fine so far. From my side you can 
go ahead with the hrtimer reduction to hard-irq context (for 2.6.29).

Regards,
Oliver

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