From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 14972] New: [regression] msync() call on ext4 causes disk
thrashing
Date: Fri, 1 Jan 2010 23:09:50 GMT
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http://bugzilla.kernel.org/show_bug.cgi?id=14972
Summary: [regression] msync() call on ext4 causes disk
thrashing
Product: File System
Version: 2.5
Kernel Version: 2.6.32.2
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: ext4
AssignedTo: fs_ext4@kernel-bugs.osdl.org
ReportedBy: t.artem@mailcity.com
Regression: Yes
Created an attachment (id=24398)
--> (http://bugzilla.kernel.org/attachment.cgi?id=24398)
run this way ./test test.txt 100
The attached application causes useless disk thrashing in case of ext4, but
works normally in case of ext3 (and possibly other FS's).
msync() for unchanged mmap'ed files shouldn't cause disk/HDD activity which I
do observe.
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