From: Ingo Molnar <mingo@elte.hu>
To: cl@linux-foundation.org
Cc: akpm@linux-foundation.org, linux-mm@kvack.org,
Tejun Heo <tj@kernel.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
rusty@rustcorp.com.au, davem@davemloft.net,
Pekka Enberg <penberg@cs.helsinki.fi>
Subject: Re: [this_cpu_xx V3 11/19] RCU: Use this_cpu operations
Date: Thu, 1 Oct 2009 21:17:03 +0200 [thread overview]
Message-ID: <20091001191703.GC24158@elte.hu> (raw)
In-Reply-To: <20091001174121.651756642@gentwo.org>
* cl@linux-foundation.org <cl@linux-foundation.org> wrote:
> RCU does not do dynamic allocations but it increments per cpu variables
> a lot. These instructions results in a move to a register and then back
> to memory. This patch will make it use the inc/dec instructions on x86
> that do not need a register.
>
> Acked-by: Tejun Heo <tj@kernel.org>
> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
> Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
>
> ---
> kernel/rcutorture.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
_PLEASE_ Cc: all these this_cpu patches to lkml in the future, all the
time. It's obviously interesting on a core kernel level and shouldnt be
sent to linux-mm alone.
Thanks a ton,
Ingo
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next prev parent reply other threads:[~2009-10-01 18:32 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-01 17:40 [this_cpu_xx V3 00/19] Introduce per cpu atomic operations and avoid per cpu address arithmetic cl
2009-10-01 17:40 ` [this_cpu_xx V3 01/19] Introduce this_cpu_ptr() and generic this_cpu_* operations cl
2009-10-01 17:40 ` [this_cpu_xx V3 02/19] this_cpu: X86 optimized this_cpu operations cl
2009-10-01 17:40 ` [this_cpu_xx V3 03/19] Use this_cpu operations for SNMP statistics cl
2009-10-01 17:40 ` [this_cpu_xx V3 04/19] Use this_cpu operations for NFS statistics cl
2009-10-01 17:40 ` [this_cpu_xx V3 05/19] use this_cpu ops for network statistics cl
2009-10-01 19:35 ` David Miller
2009-10-01 17:40 ` [this_cpu_xx V3 06/19] this_cpu_ptr: Straight transformations cl
2009-10-01 17:40 ` [this_cpu_xx V3 07/19] this_cpu_ptr: Eliminate get/put_cpu cl
2009-10-01 17:40 ` [this_cpu_xx V3 08/19] this_cpu_ptr: xfs_icsb_modify_counters does not need "cpu" variable cl
2009-10-01 17:40 ` [this_cpu_xx V3 09/19] Use this_cpu_ptr in crypto subsystem cl
2009-10-01 17:40 ` [this_cpu_xx V3 10/19] Use this_cpu ops for VM statistics cl
2009-10-01 17:40 ` [this_cpu_xx V3 11/19] RCU: Use this_cpu operations cl
2009-10-01 19:17 ` Ingo Molnar [this message]
2009-10-01 17:40 ` [this_cpu_xx V3 12/19] Move early initialization of pagesets out of zone_wait_table_init() cl
2009-10-01 17:40 ` [this_cpu_xx V3 13/19] this_cpu_ops: page allocator conversion cl
2009-10-01 17:40 ` [this_cpu_xx V3 14/19] this_cpu ops: Remove pageset_notifier cl
2009-10-01 17:40 ` [this_cpu_xx V3 15/19] Use this_cpu operations in slub cl
2009-10-01 17:40 ` [this_cpu_xx V3 16/19] SLUB: Get rid of dynamic DMA kmalloc cache allocation cl
2009-10-01 17:40 ` [this_cpu_xx V3 17/19] this_cpu: Remove slub kmem_cache fields cl
2009-10-01 17:40 ` [this_cpu_xx V3 18/19] Make slub statistics use this_cpu_inc cl
2009-10-01 17:40 ` [this_cpu_xx V3 19/19] this_cpu: slub aggressive use of this_cpu operations in the hotpaths cl
2009-10-02 9:29 ` [this_cpu_xx V3 00/19] Introduce per cpu atomic operations and avoid per cpu address arithmetic Ingo Molnar
2009-10-02 9:31 ` Ingo Molnar
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