From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Paulo Marques <pmarques@grupopie.com>
Cc: kosaki.motohiro@jp.fujitsu.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, Rik van Riel <riel@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC] mmaped copy too slow?
Date: Wed, 16 Jan 2008 11:05:09 +0900 [thread overview]
Message-ID: <20080116110200.11B4.KOSAKI.MOTOHIRO@jp.fujitsu.com> (raw)
In-Reply-To: <478CAB25.30300@grupopie.com>
Hi Paulo
> One thing you could also try is to pass MAP_POPULATE to mmap so that the
> page tables are filled in at the time of the mmap, avoiding a lot of
> page faults later.
>
> Just my 2 cents,
OK, I will test your idea and report about tomorrow.
but I don't think page fault is major performance impact.
may be, below 2 things too big
- stupid page reclaim
- large cache pollution by memcpy.
Just my 2 cents :-p
- kosaki
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next prev parent reply other threads:[~2008-01-16 2:05 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-15 1:45 KOSAKI Motohiro
2008-01-15 2:15 ` Rik van Riel
2008-01-15 3:20 ` KOSAKI Motohiro
2008-01-15 8:57 ` Peter Zijlstra
2008-01-15 9:03 ` KOSAKI Motohiro
2008-01-15 9:08 ` Peter Zijlstra
2008-01-15 12:46 ` Paulo Marques
2008-01-16 2:05 ` KOSAKI Motohiro [this message]
2008-01-17 3:23 ` KOSAKI Motohiro
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