linux-kernel - Re: [PATCH V2 Resend 4/4] timer: Migrate running timer

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Message-ID: <20130522090643.GB18810@twins.programming.kicks-ass.net>
Date:	Wed, 22 May 2013 11:06:43 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>, pjt@...gle.com,
	paul.mckenney@...aro.org, tj@...nel.org, mingo@...hat.com,
	Arvind.Chauhan@....com, linaro-dev@...ts.linaro.org,
	patches@...aro.org, pdsw-power-team@....com,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	john stultz <johnstul@...ibm.com>
Subject: Re: [PATCH V2 Resend 4/4] timer: Migrate running timer

On Wed, May 22, 2013 at 02:04:16PM +0530, Viresh Kumar wrote:

> So, this is the clean draft for the idea I had.. (Naming is poor for
> now):
> 
> diff --git a/include/linux/timer.h b/include/linux/timer.h
> index 8c5a197..ad00ebe 100644
> --- a/include/linux/timer.h
> +++ b/include/linux/timer.h
> @@ -20,6 +20,7 @@ struct timer_list {
> 
>         void (*function)(unsigned long);
>         unsigned long data;
> +       int wait_for_migration_to_complete;

If you play games with the alignment constraints of struct tvec_base you
can get extra low bits to play with for TIMER_FLAG_MASK. See struct
pool_workqueue for similar games.

That would avoid the struct bloat and I suppose make tglx happy :-)
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