From: Ingo Molnar <mingo@elte.hu>
To: Andi Kleen <andi@firstfloor.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Eric Dumazet <dada1@cosmosbay.com>,
linux kernel <linux-kernel@vger.kernel.org>,
David Miller <davem@davemloft.net>,
cl@linux.com, jesse.brandeburg@intel.com, netdev@vger.kernel.org,
haoki@redhat.com, mchan@broadcom.com, davidel@xmailserver.org
Subject: Re: [PATCH] poll: Avoid extra wakeups in select/poll
Date: Wed, 29 Apr 2009 11:22:40 +0200 [thread overview]
Message-ID: <20090429092240.GA30403@elte.hu> (raw)
In-Reply-To: <20090429073539.GR27382@one.firstfloor.org>
* Andi Kleen <andi@firstfloor.org> wrote:
> > Seems that this is a virtuous patch even though Christoph is struggling
> > a bit to test it?
>
> The main drawback is that the select/poll data structures will get
> larger. That could cause regression in theory. [...]
Current size of struct poll_table_entry is 0x38 on 64-bit kernels.
Adding the key will make it 0x40 - which is not only a power of two
but also matches cache line size on most modern CPUs.
So the size of this structure is ideal now and arithmetics on the
poll table have become simpler as well.
So the patch has my ack:
Acked-by: Ingo Molnar <mingo@elte.hu>
Ingo
next prev parent reply other threads:[~2009-04-29 9:23 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-24 20:10 udp ping pong with various process bindings (and correct cpu mappings) Christoph Lameter
2009-04-24 21:18 ` Eric Dumazet
2009-04-25 15:47 ` [PATCH] net: Avoid extra wakeups of threads blocked in wait_for_packet() Eric Dumazet
2009-04-26 9:04 ` David Miller
2009-04-26 10:46 ` [PATCH] poll: Avoid extra wakeups Eric Dumazet
2009-04-26 13:33 ` Jarek Poplawski
2009-04-26 14:27 ` Eric Dumazet
2009-04-28 9:15 ` David Miller
2009-04-28 9:24 ` Eric Dumazet
2009-04-28 14:21 ` Andi Kleen
2009-04-28 14:58 ` Eric Dumazet
2009-04-28 15:06 ` [PATCH] poll: Avoid extra wakeups in select/poll Eric Dumazet
2009-04-28 19:05 ` Christoph Lameter
2009-04-28 20:05 ` Eric Dumazet
2009-04-28 20:14 ` Christoph Lameter
2009-04-28 20:33 ` Eric Dumazet
2009-04-28 20:49 ` Christoph Lameter
2009-04-28 21:04 ` Eric Dumazet
2009-04-28 21:00 ` Christoph Lameter
2009-04-28 21:05 ` Eric Dumazet
2009-04-28 21:04 ` Christoph Lameter
2009-04-28 21:11 ` Eric Dumazet
2009-04-29 9:11 ` Ingo Molnar
2009-04-30 10:49 ` Eric Dumazet
2009-04-30 11:57 ` Ingo Molnar
2009-04-30 14:08 ` Eric Dumazet
2009-04-30 16:07 ` [BUG] perf_counter: change cpu frequencies Eric Dumazet
2009-05-03 6:06 ` Eric Dumazet
2009-05-03 7:25 ` Ingo Molnar
2009-05-04 10:39 ` Eric Dumazet
2009-04-30 21:24 ` [PATCH] poll: Avoid extra wakeups in select/poll Paul E. McKenney
2009-04-29 7:20 ` Andrew Morton
2009-04-29 7:35 ` Andi Kleen
2009-04-29 7:37 ` Eric Dumazet
2009-04-29 9:22 ` Ingo Molnar [this message]
2009-04-29 7:39 ` Eric Dumazet
2009-04-29 8:26 ` Eric Dumazet
2009-04-29 9:16 ` Ingo Molnar
2009-04-29 9:36 ` Eric Dumazet
2009-04-29 10:27 ` Ingo Molnar
2009-04-29 12:29 ` Eric Dumazet
2009-04-29 13:07 ` Ingo Molnar
2009-04-29 15:53 ` Davide Libenzi
2009-04-28 9:26 ` [PATCH] net: Avoid extra wakeups of threads blocked in wait_for_packet() David Miller
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