From: Badari Pulavarty <pbadari@us.ibm.com>
To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Cc: Arjan van de Ven <arjan@infradead.org>,
linux-mm <linux-mm@kvack.org>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: Better pagecache statistics ?
Date: Thu, 01 Dec 2005 10:20:12 -0800 [thread overview]
Message-ID: <1133461212.21429.49.camel@localhost.localdomain> (raw)
In-Reply-To: <20051201175711.GA17169@dmt.cnet>
On Thu, 2005-12-01 at 15:57 -0200, Marcelo Tosatti wrote:
> On Thu, Dec 01, 2005 at 06:21:39PM +0100, Arjan van de Ven wrote:
> > On Thu, 2005-12-01 at 09:15 -0800, Badari Pulavarty wrote:
> > > > Most of the issues you mention are null if you move the stats
> > > > maintenance burden to userspace.
> > > >
> > > > The performance impact is also minimized since the hooks
> > > > (read: overhead) can be loaded on-demand as needed.
> > > >
> > >
> > > The overhead is - going through each mapping/inode in the system
> > > and dumping out "nrpages" - to get per-file statistics. This is
> > > going to be expensive, need locking and there is no single list
> > > we can traverse to get it. I am not sure how to do this.
>
> Can't you add hooks to add_to_page_cache/remove_from_page_cache
> to record pagecache activity ?
In theory, yes. We already maintain info in "mapping->nrpages".
Trick would be to collect all of them, send them to user space.
Thanks,
Badari
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next prev parent reply other threads:[~2005-12-01 18:20 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-30 18:57 Badari Pulavarty
2005-12-01 2:35 ` Hareesh Nagarajan
2005-12-01 15:20 ` Marcelo Tosatti
2005-12-01 15:59 ` Badari Pulavarty
2005-12-01 16:10 ` Arjan van de Ven
2005-12-01 16:23 ` Badari Pulavarty
2005-12-01 17:08 ` Marcelo Tosatti
2005-12-01 17:15 ` Badari Pulavarty
2005-12-01 17:21 ` Arjan van de Ven
2005-12-01 17:57 ` Marcelo Tosatti
2005-12-01 18:20 ` Badari Pulavarty [this message]
2005-12-02 22:15 ` Frank Ch. Eigler
2005-12-02 22:31 ` Badari Pulavarty
2005-12-02 22:46 ` Frank Ch. Eigler
2005-12-02 23:46 ` Badari Pulavarty
2005-12-01 18:24 ` Badari Pulavarty
2005-12-04 18:48 ` Martin J. Bligh
2005-12-01 17:19 ` Marcelo Tosatti
2005-12-01 17:31 ` Badari Pulavarty
2005-12-01 18:15 ` Marcelo Tosatti
2005-12-01 18:25 ` Badari Pulavarty
2005-12-01 16:00 ` Marcelo Tosatti
2005-12-01 21:16 ` Christoph Lameter
2005-12-02 0:13 ` Badari Pulavarty
2005-12-28 1:33 ` Marcelo Tosatti
2005-12-28 19:36 ` Tom Zanussi
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