From: David Chow <davidchow@shaolinmicro.com>
To: linux-fsdevel@vger.kernel.org
Subject: question on bmap
Date: Wed, 22 Jan 2003 23:15:14 +0800 [thread overview]
Message-ID: <3E2EB582.5050005@shaolinmicro.com> (raw)
Hi all,
I am writing a persistent disk cache for a network file system. Is it
true to use bmap() plus some buffer head ops, is generally faster than
readpage() and commit_write() paths? As I know the buffer head has a
reference to the page, that means in terms of memory consumption, they
are the same (please clarify)?? Not sure which is better.. it seems bmap
is lower level, but I'm not sure is there any equivalent code like
grab_cache_page() and read_cache_page() so that I can find so
in-page_cache pages to save some I/O time. Please advice on usage and
potential pitfalls. Thanks for any comments.
regards,
David Chow
reply other threads:[~2003-01-22 15:15 UTC|newest]
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