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From: Christoph Hellwig <hch@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Peter Zijlstra <peterz@infradead.org>, Tejun Heo <tj@kernel.org>,
	Jens Axboe <axboe@kernel.dk>, Ingo Molnar <mingo@elte.hu>,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [patch 1/4] sched: Separate the scheduler entry for preemption
Date: Wed, 22 Jun 2011 14:43:28 -0400	[thread overview]
Message-ID: <20110622184328.GA6475@infradead.org> (raw)
In-Reply-To: <20110622174918.813258321@linutronix.de>

On Wed, Jun 22, 2011 at 05:52:13PM -0000, Thomas Gleixner wrote:
> Block-IO and workqueues call into notifier functions from the
> scheduler core code with interrupts and preemption disabled. These
> calls should be made before entering the scheduler core.
> 
> To simplify this, separate the scheduler core code into
> __schedule(). __schedule() is directly called from the places which
> set PREEMPT_ACTIVE and from schedule(). This allows us to add the work
> checks into schedule(), so they are only called when a task voluntary
> goes to sleep.

I don't think that works.  We'll need to flush the block requests even
for an involuntary schedule.


  reply	other threads:[~2011-06-22 18:43 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-06-22 17:52 [patch 0/4] sched: Move work out of the scheduler core Thomas Gleixner
2011-06-22 17:52 ` [patch 1/4] sched: Separate the scheduler entry for preemption Thomas Gleixner
2011-06-22 18:43   ` Christoph Hellwig [this message]
2011-06-22 18:52     ` Thomas Gleixner
2011-06-22 19:42     ` Jens Axboe
2011-06-22 20:15       ` Thomas Gleixner
2011-06-23 11:41         ` Jens Axboe
2011-08-29 14:55   ` [tip:sched/urgent] " tip-bot for Thomas Gleixner
2011-06-22 17:52 ` [patch 3/4] block: Shorten interrupt disabled regions Thomas Gleixner
2011-06-22 17:52 ` [patch 2/4] sched: Move blk_schedule_flush_plug() out of __schedule() Thomas Gleixner
2011-06-22 17:52 ` [patch 4/4] sched: Distangle worker accounting from rq->lock Thomas Gleixner
2011-06-22 19:30   ` Thomas Gleixner
2011-06-23  8:37   ` Tejun Heo
2011-06-23  9:58     ` Thomas Gleixner
2011-06-23 10:15       ` Tejun Heo
2011-06-23 10:44         ` Ingo Molnar
2011-06-23 11:35           ` Tejun Heo
2011-06-23 12:51             ` Ingo Molnar
2011-06-24  9:01             ` Thomas Gleixner
2011-06-26 10:19               ` Tejun Heo
2011-06-23 15:07   ` Tejun Heo
2013-04-30 13:37   ` Steven Rostedt
2013-04-30 22:47     ` Steven Rostedt
2013-05-03  0:12       ` Tejun Heo
2013-05-03  0:57         ` Steven Rostedt
2013-07-24 10:04           ` Thomas Gleixner
2013-08-06 19:33             ` Steven Rostedt

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