From: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
To: Nikita Danilov <nikita@clusterfs.com>
Cc: Linux Kernel Mailing List <Linux-Kernel@vger.kernel.org>,
Andrew Morton <AKPM@Osdl.ORG>,
Linux MM Mailing List <linux-mm@kvack.org>
Subject: Re: [PATCH]: 1/4 batch mark_page_accessed()
Date: Sat, 27 Nov 2004 06:19:40 -0200 [thread overview]
Message-ID: <20041127081940.GB7740@logos.cnet> (raw)
In-Reply-To: <16808.23030.312384.635657@gargle.gargle.HOWL>
On Sat, Nov 27, 2004 at 01:41:58PM +0300, Nikita Danilov wrote:
> Marcelo Tosatti writes:
>
> [...]
>
> >
> > Average Half Load -j 4 Run: Average Half Load -j 4 Run:
> > Elapsed Time 274.916 Elapsed Time 245.026
> > User Time 833.63 User Time 832.34
> > System Time 73.704 System Time 73.41
> > Percent CPU 335.8 Percent CPU 373.6
> > Context Switches 12984.8 Context Switches 13427.4
> > Sleeps 21459.2 Sleeps 21642
>
> What is "System Time" here? Does in include CPU consumption by, say,
> kswapd?
I dont think "System Time" counts for kswapd - but only time spent inside
the kernel, including page reclamation efforts.
> If not, then one may conjecture that mark_page_accessed batching
> modifies ordering of pages on zone "LRU" lists in a way that measurably
> changes efficiency of VM scanning, and mostly affects process that scans
> most---kswapd.
I agree.
WARNING: multiple messages have this Message-ID (diff)
From: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
To: Nikita Danilov <nikita@clusterfs.com>
Cc: Linux Kernel Mailing List <Linux-Kernel@vger.kernel.org>,
Andrew Morton <AKPM@Osdl.ORG>,
Linux MM Mailing List <linux-mm@kvack.org>
Subject: Re: [PATCH]: 1/4 batch mark_page_accessed()
Date: Sat, 27 Nov 2004 06:19:40 -0200 [thread overview]
Message-ID: <20041127081940.GB7740@logos.cnet> (raw)
In-Reply-To: <16808.23030.312384.635657@gargle.gargle.HOWL>
On Sat, Nov 27, 2004 at 01:41:58PM +0300, Nikita Danilov wrote:
> Marcelo Tosatti writes:
>
> [...]
>
> >
> > Average Half Load -j 4 Run: Average Half Load -j 4 Run:
> > Elapsed Time 274.916 Elapsed Time 245.026
> > User Time 833.63 User Time 832.34
> > System Time 73.704 System Time 73.41
> > Percent CPU 335.8 Percent CPU 373.6
> > Context Switches 12984.8 Context Switches 13427.4
> > Sleeps 21459.2 Sleeps 21642
>
> What is "System Time" here? Does in include CPU consumption by, say,
> kswapd?
I dont think "System Time" counts for kswapd - but only time spent inside
the kernel, including page reclamation efforts.
> If not, then one may conjecture that mark_page_accessed batching
> modifies ordering of pages on zone "LRU" lists in a way that measurably
> changes efficiency of VM scanning, and mostly affects process that scans
> most---kswapd.
I agree.
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next prev parent reply other threads:[~2004-11-27 13:29 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-21 15:44 [PATCH]: 1/4 batch mark_page_accessed() Nikita Danilov
2004-11-21 15:44 ` Nikita Danilov
2004-11-21 21:12 ` Andrew Morton
2004-11-21 21:12 ` Andrew Morton
2004-11-24 10:40 ` Marcelo Tosatti
2004-11-24 10:40 ` Marcelo Tosatti
2004-11-24 16:32 ` Marcelo Tosatti
2004-11-24 16:32 ` Marcelo Tosatti
2004-11-24 21:53 ` Nikita Danilov
2004-11-24 21:53 ` Nikita Danilov
2004-11-26 18:58 ` Marcelo Tosatti
2004-11-26 18:58 ` Marcelo Tosatti
2004-11-27 0:37 ` Nick Piggin
2004-11-27 0:37 ` Nick Piggin
2004-11-30 16:29 ` Marcelo Tosatti
2004-11-30 16:29 ` Marcelo Tosatti
2004-12-01 1:33 ` Andrew Morton
2004-12-01 1:33 ` Andrew Morton
2004-11-30 22:57 ` Marcelo Tosatti
2004-11-30 22:57 ` Marcelo Tosatti
2004-12-01 12:23 ` Nikita Danilov
2004-12-01 12:23 ` Nikita Danilov
2004-12-01 18:58 ` Marcelo Tosatti
2004-12-01 18:58 ` Marcelo Tosatti
2004-12-02 1:59 ` Andrew Morton
2004-12-02 1:59 ` Andrew Morton
2004-11-27 10:41 ` Nikita Danilov
2004-11-27 10:41 ` Nikita Danilov
2004-11-27 8:19 ` Marcelo Tosatti [this message]
2004-11-27 8:19 ` Marcelo Tosatti
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