From: fche@redhat.com (Frank Ch. Eigler)
To: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Marcelo Tosatti <marcelo.tosatti@cyclades.com>,
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: 02 Dec 2005 17:15:18 -0500 [thread overview]
Message-ID: <y0md5kfxi15.fsf@tooth.toronto.redhat.com> (raw)
In-Reply-To: <1133461212.21429.49.camel@localhost.localdomain>
Badari Pulavarty <pbadari@us.ibm.com> writes:
> > 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.
If you happened to have a copy of systemtap built, you might run this
script instead of inserting static hooks into your kernel. (The tool
has come some way since the OLS '2005 demo.)
#! stap
probe kernel.function("add_to_page_cache") {
printf("pid %d added pages (%d)\n", pid(), $mapping->nrpages)
}
probe kernel.function("__remove_from_page_cache") {
printf("pid %d removed pages (%d)\n", pid(), $page->mapping->nrpages)
}
- FChE
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next prev parent reply other threads:[~2005-12-02 22:15 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
2005-12-02 22:15 ` Frank Ch. Eigler [this message]
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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