From: Theodore Ts'o <tytso@mit.edu>
Date: Tue, 7 Apr 2009 22:12:43 +0000 (-0400)
Subject: block_write_full_page: switch synchronous writes to use WRITE_SYNC_PLUG
X-Git-Tag: v2.6.30-rc2~111^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6e34eeddf7deec1444bbddab533f03f520d8458c;p=pandora-kernel.git

block_write_full_page: switch synchronous writes to use WRITE_SYNC_PLUG

Now that we have a distinction between WRITE_SYNC and WRITE_SYNC_PLUG,
use WRITE_SYNC_PLUG in __block_write_full_page() to avoid unplugging
the block device I/O queue between each page that gets flushed out.

Otherwise, when we run sync() or fsync() and we need to write out a
large number of pages, the block device queue will get unplugged
between for every page that is flushed out, which will be a pretty
serious performance regression caused by commit a64c8610.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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