linux-kernel - Re: fork_idle from wq cleanup

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Message-ID: <1331100381.2259.2.camel@sbsiddha-mobl2>
Date:	Tue, 06 Mar 2012 22:06:21 -0800
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Venkatesh Pallipadi <venki@...gle.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Aaron Durbin <adurbin@...gle.com>,
	Paul Turner <pjt@...gle.com>,
	Yong Zhang <yong.zhang0@...il.com>,
	linux-kernel@...r.kernel.org, Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: fork_idle from wq cleanup

On Tue, 2012-03-06 at 13:41 -0800, Venkatesh Pallipadi wrote:
> I looked at avoiding the wq stuff. But, there is no easy/clean way to do
> if as we have number of routines within copy_process assume current
> being the parent.
> 
> But, we can move most of the complication out of arch code into generic code
> and share it across multiple archs. Here is the patch for that.
> 
> We can easily add x86 percpu idle task on top of this cleanup (except for
> mini-circus to switch idle_task of CPU 0).
> 
> Sorry. The patches for ia64, mips, powerpc and s390 are untested and are in
> "should work" category.
> 
> Overall diffstat looks like
> ---
>  arch/ia64/kernel/smpboot.c |   49 ++---------------------------
>  arch/mips/kernel/smp.c     |   47 +---------------------------
>  arch/powerpc/kernel/smp.c  |   63 ++++----------------------------------
>  arch/s390/kernel/smp.c     |   38 +++--------------------
>  arch/x86/kernel/smpboot.c  |   74 ++++++---------------------------------------
>  include/linux/sched.h      |    1 
>  kernel/fork.c              |   48 +++++++++++++++++++++++++++++
>  7 files changed, 79 insertions(+), 241 deletions(-)
> 

Looks good to me.

Reviewed-by: Suresh Siddha <suresh.b.siddha@...el.com>

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