From: Andi Kleen <ak@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>, Peter Anvin <hpa@zytor.com>,
Mike Galbraith <bitbucket@online.de>,
Thomas Gleixner <tglx@linutronix.de>,
Arjan van de Ven <arjan@linux.intel.com>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org
Subject: Re: [RFC][PATCH 0/5] preempt_count rework
Date: Wed, 14 Aug 2013 09:48:27 -0700 [thread overview]
Message-ID: <20130814164827.GN23412@tassilo.jf.intel.com> (raw)
In-Reply-To: <20130814131539.790947874@chello.nl>
On Wed, Aug 14, 2013 at 03:15:39PM +0200, Peter Zijlstra wrote:
> These patches optimize preempt_enable by firstly folding the preempt and
> need_resched tests into one -- this should work for all architectures. And
> secondly by providing per-arch preempt_count implementations; with x86 using
> per-cpu preempt_count for fastest access.
>
> These patches have so far only been compiled for defconfig-x86_64 +
> CONFIG_PREEMPT=y and boot tested with kvm -smp 4 upto wanting to mount root.
>
> It still needs asm volatile("call preempt_schedule": : :"memory"); as per
> Andi's other patches to avoid the C calling convention cluttering the
> preempt_enable() sites.
FWIW I removed the user_schedule in v2 because I don't need it anymore.
Feel free to pick it up from v1 though.
It needs two patches: the one adding SAVE_ALL for 32bit and
the parts of the put_user() patch adding user_schedule
When it's not used in user_ anymore it should probably
be renamed too, to preempt_schedule or somesuch,
and probably moved to a different file.
-Andi
next prev parent reply other threads:[~2013-08-14 16:48 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-14 13:15 [RFC][PATCH 0/5] preempt_count rework Peter Zijlstra
2013-08-14 13:15 ` [RFC][PATCH 1/5] sched: Introduce preempt_count accessor functions Peter Zijlstra
2013-08-14 13:15 ` [RFC][PATCH 2/5] sched: Add NEED_RESCHED to the preempt_count Peter Zijlstra
2013-08-14 13:15 ` [RFC][PATCH 3/5] sched, arch: Create asm/preempt.h Peter Zijlstra
2013-08-14 13:15 ` [RFC][PATCH 4/5] sched: Create more preempt_count accessors Peter Zijlstra
2013-08-14 13:15 ` [RFC][PATCH 5/5] sched, x86: Provide a per-cpu preempt_count implementation Peter Zijlstra
2013-08-14 13:47 ` [RFC][PATCH 0/5] preempt_count rework H. Peter Anvin
2013-08-14 15:39 ` Mike Galbraith
2013-08-14 15:43 ` H. Peter Anvin
2013-08-15 9:01 ` Mike Galbraith
2013-08-14 16:06 ` Peter Zijlstra
2013-08-14 16:14 ` H. Peter Anvin
2013-08-14 16:52 ` Peter Zijlstra
2013-08-14 16:58 ` H. Peter Anvin
2013-08-14 16:04 ` Peter Zijlstra
2013-08-14 17:31 ` Peter Zijlstra
2013-08-14 16:48 ` Andi Kleen [this message]
2013-08-14 16:55 ` Peter Zijlstra
2013-08-14 17:12 ` Andi Kleen
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