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Re: [PATCH 2/2] smp_call_function: use rwlocks on queues rather than rcu
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From: Paul E. McKenney
Subject:
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues rather than rcu
Date: Friday, August 22, 2008 - 12:52 pm
On Fri, Aug 22, 2008 at 01:36:37PM -0500, Christoph Lameter wrote:
quoted text
> Paul E. McKenney wrote: > > >>> So on your these large boxes, read-only cachelines are preferentially > >>> ejected from the cache, so that one should write to per-CPU data > >>> occasionally to keep it resident? Or is the issue the long RCU grace > >>> periods which allow the structure being freed to age out of all relevant > >>> caches? (My guess would be the second.) > >> The issue are the RCU grace period that are generally long enough to make the > >> cacheline fall out of all caches. > > > > Would it make sense to push the freed-by-RCU memory further up the > > hierarchy, so that such memory is not mistaken for recently freed > > hot-in-cache memory? > > That would mean passing a gfp flag like __GFP_COLD on free from RCU? Or how > would that work at the higher levels?
I was indeed thinking in terms of the free from RCU being specially marked. Thanx, Paul --
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Messages in current thread:
[PATCH 2/2] smp_call_function: use rwlocks on queues rathe ...
, Jeremy Fitzhardinge
, (Thu Aug 21, 5:29 pm)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Nick Piggin
, (Thu Aug 21, 6:53 pm)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Ingo Molnar
, (Thu Aug 21, 11:28 pm)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Pekka Enberg
, (Fri Aug 22, 12:06 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Ingo Molnar
, (Fri Aug 22, 12:12 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Nick Piggin
, (Fri Aug 22, 2:12 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Christoph Lameter
, (Fri Aug 22, 7:01 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Paul E. McKenney
, (Fri Aug 22, 8:11 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Christoph Lameter
, (Fri Aug 22, 10:14 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Paul E. McKenney
, (Fri Aug 22, 11:29 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Andi Kleen
, (Fri Aug 22, 11:33 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Jeremy Fitzhardinge
, (Fri Aug 22, 11:35 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Christoph Lameter
, (Fri Aug 22, 11:36 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Paul E. McKenney
, (Fri Aug 22, 12:52 pm)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Christoph Lameter
, (Fri Aug 22, 1:03 pm)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Paul E. McKenney
, (Fri Aug 22, 1:53 pm)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Paul E. McKenney
, (Fri Aug 22, 3:40 pm)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Andi Kleen
, (Sat Aug 23, 12:34 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Jeremy Fitzhardinge
, (Sat Aug 23, 9:55 pm)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Andi Kleen
, (Sun Aug 24, 2:01 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Peter Zijlstra
, (Mon Aug 25, 3:31 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Paul E. McKenney
, (Mon Aug 25, 8:12 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Peter Zijlstra
, (Mon Aug 25, 8:22 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Christoph Lameter
, (Mon Aug 25, 8:44 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Christoph Lameter
, (Mon Aug 25, 8:46 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Peter Zijlstra
, (Mon Aug 25, 8:51 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Paul E. McKenney
, (Mon Aug 25, 1:04 pm)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Paul E. McKenney
, (Mon Aug 25, 1:05 pm)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues
, Nick Piggin
, (Mon Aug 25, 10:13 pm)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Paul E. McKenney
, (Tue Aug 26, 6:40 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Paul E. McKenney
, (Tue Aug 26, 6:43 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Peter Zijlstra
, (Tue Aug 26, 7:07 am)
Re: [PATCH 2/2] smp_call_function: use rwlocks on queues r ...
, Paul E. McKenney
, (Wed Aug 27, 8:16 am)
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