From: Linus Torvalds <torvalds@linux-foundation.org>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: npiggin@suse.de, rostedt@goodmis.org,
mathieu.desnoyers@efficios.com, peterz@infradead.org,
fweisbec@gmail.com, tardyp@gmail.com, mingo@elte.hu,
acme@redhat.com, tzanussi@gmail.com, paulus@samba.org,
linux-kernel@vger.kernel.org, arjan@infradead.org,
ziga.mahkovec@gmail.com, davem@davemloft.net, linux-mm@kvack.org,
akpm@linux-foundation.org, kosaki.motohiro@jp.fujitsu.com,
cl@linux-foundation.org, tj@kernel.org, jens.axboe@oracle.com
Subject: Re: Unexpected splice "always copy" behavior observed
Date: Wed, 19 May 2010 09:01:14 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.2.00.1005190900050.23538@i5.linux-foundation.org> (raw)
In-Reply-To: <E1OEldM-00063C-Ew@pomaz-ex.szeredi.hu>
On Wed, 19 May 2010, Miklos Szeredi wrote:
>
> And predictability is good. The thing I don't like about the above is
> that it makes it totally unpredictable which pages will get moved, if
> any.
Tough.
Think of it this way: it is predictable. They get predictably moved when
moving is cheap and easy. It's about _performance_.
Do you know when TLB misses happen? They are unpredictable. Do you know
when the OS sends IPI's around? Do you know when scheduling happens?
No you don't. So stop whining.
Linus
prev parent reply other threads:[~2010-05-19 16:04 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-18 15:34 Mathieu Desnoyers
2010-05-18 15:51 ` Nick Piggin
2010-05-18 15:56 ` Christoph Lameter
2010-05-18 16:00 ` Nick Piggin
2010-05-18 16:13 ` Nick Piggin
2010-05-18 15:53 ` Steven Rostedt
2010-05-18 16:10 ` Steven Rostedt
2010-05-18 16:25 ` Linus Torvalds
2010-05-19 6:31 ` Nick Piggin
2010-05-19 14:39 ` Linus Torvalds
2010-05-19 14:56 ` Steven Rostedt
2010-05-19 14:59 ` Linus Torvalds
2010-05-19 15:12 ` Steven Rostedt
2010-05-19 15:51 ` Mathieu Desnoyers
2010-05-19 15:33 ` Miklos Szeredi
2010-05-19 15:45 ` Steven Rostedt
2010-05-19 15:55 ` Nick Piggin
2010-05-19 16:01 ` Mathieu Desnoyers
2010-05-19 16:36 ` Steven Rostedt
2010-05-19 15:57 ` Mathieu Desnoyers
2010-05-19 16:27 ` Nick Piggin
2010-05-19 19:14 ` Mathieu Desnoyers
2010-05-19 19:31 ` Linus Torvalds
2010-05-19 21:49 ` Mathieu Desnoyers
2010-05-20 0:04 ` Linus Torvalds
2010-05-20 1:56 ` Mathieu Desnoyers
2010-05-20 14:18 ` Linus Torvalds
2010-05-19 20:59 ` Rick Sherm
2010-05-19 15:17 ` Nick Piggin
2010-05-19 15:30 ` Linus Torvalds
2010-05-19 15:44 ` Nick Piggin
2010-05-19 15:28 ` Miklos Szeredi
2010-05-19 15:32 ` Linus Torvalds
2010-05-19 15:56 ` Miklos Szeredi
2010-05-19 16:01 ` Linus Torvalds [this message]
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