[Bug 14972] [regression] msync() call on ext4 causes disk thrashing

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http://bugzilla.kernel.org/show_bug.cgi?id=14972





--- Comment #7 from Artem S. Tashkinov <t.artem@mailcity.com>  2010-01-03 10:31:49 ---
Created an attachment (id=24417)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=24417)
trace pipe output

blktrace produces zero output, so I'm attaching trace pipe output while running
this test application.

I tried using blktrace this way:

# mount -t debugfs nul /sys/kernel/debug
# echo blk > /sys/kernel/debug/tracing/current_tracer
# echo 1 > /sys/block/sda/sda3/trace/enable

# blktrace /dev/sda3
BLKTRACESETUP(2) /dev/sda3 failed: 16/Device or resource busy
Thread 0 failed open /sys/kernel/debug/block/(null)/trace0: 2/No such file or
directory
Thread 1 failed open /sys/kernel/debug/block/(null)/trace1: 2/No such file or
directory
FAILED to start thread on CPU 0: 1/Operation not permitted
FAILED to start thread on CPU 1: 1/Operation not permitted

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