linux-ext4 - [Bug 14972] New: [regression] msync() call on ext4 causes disk thrashing

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Date:	Fri, 1 Jan 2010 23:09:50 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 14972] New: [regression] msync() call on ext4 causes disk
 thrashing

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@...nel-bugs.osdl.org
        ReportedBy: t.artem@...lcity.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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