From: Matthew Wilcox <matthew@wil.cx>
To: Ravish Tayal <ravish.tayal@gmail.com>
Cc: linux-arm@vger.kernel.org, linux-scsi@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-usb@vger.kernel.org,
ravish.tayal@conexant.com
Subject: Re: Query to optimize PageCache size in system
Date: Wed, 13 May 2009 09:54:45 -0600 [thread overview]
Message-ID: <20090513155444.GF15360@parisc-linux.org> (raw)
In-Reply-To: <e42309110905130805r135c3373xa6ecda0e45180d34@mail.gmail.com>
On Wed, May 13, 2009 at 08:35:52PM +0530, Ravish Tayal wrote:
> I am looking for help to reduce the number of cached pages in the
> system. I am using 2.6.12 linux kernel on ARM processor.for my
> embedded USB mass storage application.
Why do you think the number of cached pages is a problem? What problem
are you experiencing that you think is caused by having a large number
of cached pages?
> 3. Is there any provision in linux kernel through which I can restrict
> the new page allocation for disk operation to not to be added in the
> page-cache ?
> 4. If I open the file with O_DIRECT Flag would page_cache be avoided,
> irrespective it is file read or File write operations?
Question 4 appears to be the answer to question 3. O_DIRECT works for
both reads and writes, but does have restrictions on alignment.
--
Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
next prev parent reply other threads:[~2009-05-13 15:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <e42309110905130732xf4313a6qba1f30a2d89728be@mail.gmail.com>
[not found] ` <e42309110905130732xf4313a6qba1f30a2d89728be-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-05-13 15:05 ` Query to optimize PageCache size in system Ravish Tayal
2009-05-13 15:43 ` Greg KH
2009-05-13 15:54 ` Matthew Wilcox [this message]
2009-05-14 21:00 ` Jamie Lokier
[not found] ` <e42309110905142210k332b8818l695a03efdc75673f@mail.gmail.com>
2009-05-15 5:51 ` Fwd: " Ravish Tayal
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20090513155444.GF15360@parisc-linux.org \
--to=matthew@wil.cx \
--cc=linux-arm@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-scsi@vger.kernel.org \
--cc=linux-usb@vger.kernel.org \
--cc=ravish.tayal@conexant.com \
--cc=ravish.tayal@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.