From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 14972] [regression] msync() call on ext4 causes disk thrashing
Date: Sun, 3 Jan 2010 10:31:53 GMT
Message-ID: <201001031031.o03AVraM027501@demeter.kernel.org>
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--- Comment #7 from Artem S. Tashkinov 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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