From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Christoph Lameter <cl@linux-foundation.org>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
Pekka Enberg <penberg@cs.helsinki.fi>, Tejun Heo <tj@kernel.org>,
Mel Gorman <mel@csn.ul.ie>,
mingo@elte.hu
Subject: Re: [this_cpu_xx V5 19/19] SLUB: Experimental new fastpath w/o interrupt disable
Date: Thu, 8 Oct 2009 08:44:56 -0400 [thread overview]
Message-ID: <20091008124456.GA13307@Krystal> (raw)
In-Reply-To: <1254988350.26976.256.camel@twins>
* Peter Zijlstra (peterz@infradead.org) wrote:
> On Wed, 2009-10-07 at 11:21 -0400, Christoph Lameter wrote:
> > On Wed, 7 Oct 2009, Mathieu Desnoyers wrote:
> >
> > > You are already calling the scheduler when ending the _fast_ path. I
> > > don't see the problem with calling it when you end the slow path
> > > execution.
> >
> > Well yes that gives rise to the thought of using
> >
> > preempt_enable_no_sched()
>
> NACK, delaying the reschedule is not an option
Even if only done with interrupt off, and check resched is called after
each irq enable following this critical section ? I'd like to understand
the reason behind your rejection for this specific case.
Thanks,
Mathieu
--
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
next prev parent reply other threads:[~2009-10-08 12:45 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-06 23:36 [this_cpu_xx V5 00/19] Introduce per cpu atomic operations and avoid per cpu address arithmetic cl
2009-10-06 23:36 ` [this_cpu_xx V5 01/19] Introduce this_cpu_ptr() and generic this_cpu_* operations cl
2009-10-06 23:52 ` Tejun Heo
2009-10-07 14:23 ` Christoph Lameter
2009-10-07 15:29 ` Tejun Heo
2009-10-06 23:36 ` [this_cpu_xx V5 02/19] this_cpu: X86 optimized this_cpu operations cl
2009-10-06 23:36 ` [this_cpu_xx V5 03/19] Use this_cpu operations for SNMP statistics cl
2009-10-06 23:36 ` [this_cpu_xx V5 04/19] Use this_cpu operations for NFS statistics cl
2009-10-06 23:36 ` [this_cpu_xx V5 05/19] use this_cpu ops for network statistics cl
2009-10-06 23:37 ` [this_cpu_xx V5 06/19] this_cpu_ptr: Straight transformations cl
2009-10-06 23:37 ` [this_cpu_xx V5 07/19] this_cpu_ptr: Eliminate get/put_cpu cl
2009-10-06 23:37 ` [this_cpu_xx V5 09/19] Use this_cpu_ptr in crypto subsystem cl
2009-10-06 23:37 ` [this_cpu_xx V5 10/19] Use this_cpu ops for VM statistics cl
2009-10-06 23:37 ` [this_cpu_xx V5 11/19] RCU: Use this_cpu operations cl
2009-10-06 23:37 ` [this_cpu_xx V5 12/19] this_cpu_ops: page allocator conversion cl
2009-10-06 23:37 ` [this_cpu_xx V5 13/19] this_cpu ops: Remove pageset_notifier cl
2009-10-06 23:37 ` [this_cpu_xx V5 14/19] Use this_cpu operations in slub cl
2009-10-06 23:37 ` [this_cpu_xx V5 15/19] SLUB: Get rid of dynamic DMA kmalloc cache allocation cl
2009-10-06 23:37 ` [this_cpu_xx V5 16/19] this_cpu: Remove slub kmem_cache fields cl
2009-10-06 23:37 ` [this_cpu_xx V5 17/19] Make slub statistics use this_cpu_inc cl
2009-10-06 23:37 ` [this_cpu_xx V5 18/19] this_cpu: slub aggressive use of this_cpu operations in the hotpaths cl
2009-10-06 23:37 ` [this_cpu_xx V5 19/19] SLUB: Experimental new fastpath w/o interrupt disable cl
2009-10-07 2:54 ` Mathieu Desnoyers
2009-10-07 9:11 ` Peter Zijlstra
2009-10-07 12:46 ` Mathieu Desnoyers
2009-10-07 13:01 ` Peter Zijlstra
2009-10-07 13:31 ` Mathieu Desnoyers
2009-10-07 14:37 ` Peter Zijlstra
2009-10-07 14:21 ` Christoph Lameter
2009-10-07 14:42 ` Christoph Lameter
2009-10-07 15:02 ` Mathieu Desnoyers
2009-10-07 15:05 ` Christoph Lameter
2009-10-07 15:19 ` Mathieu Desnoyers
2009-10-07 15:21 ` Christoph Lameter
2009-10-07 15:41 ` Mathieu Desnoyers
2009-10-07 16:42 ` Christoph Lameter
2009-10-07 17:12 ` Mathieu Desnoyers
2009-10-08 7:52 ` Peter Zijlstra
2009-10-08 12:44 ` Mathieu Desnoyers [this message]
2009-10-08 12:53 ` Peter Zijlstra
2009-10-08 16:17 ` Christoph Lameter
2009-10-08 17:22 ` Mathieu Desnoyers
2009-10-08 16:11 ` Christoph Lameter
2009-10-08 17:17 ` Mathieu Desnoyers
2009-10-08 17:44 ` Christoph Lameter
2009-10-08 19:17 ` Mathieu Desnoyers
2009-10-08 19:21 ` Christoph Lameter
2009-10-08 20:37 ` Mathieu Desnoyers
2009-10-08 21:08 ` Christoph Lameter
2009-10-12 13:56 ` Mathieu Desnoyers
2009-10-12 14:52 ` Christoph Lameter
2009-10-12 15:26 ` Mathieu Desnoyers
2009-10-12 15:23 ` Christoph Lameter
2009-10-12 15:38 ` Mathieu Desnoyers
2009-10-12 15:38 ` Christoph Lameter
2009-10-12 16:05 ` Mathieu Desnoyers
2009-10-07 15:25 ` Christoph Lameter
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