Hi,
I am trying to use perf lock and am not sure if
the results are correct (the bad rate is 98 %).
Is this expected behavior ?
root@linux-test ~# perf --version
perf version 3.12.0
root@linux-test ~# perf lock record cat /etc/issue
Arch Linux \r (\l)
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.356 MB perf.data (~15533 samples) ]
root@linux-test ~# perf lock report
Name acquired contended total wait (ns) max wait (ns)
min wait (ns)
&cpuctx_lock 0 0 0 0
0
&sig->cred_guard... 0 0 0 0
0
=== output for debug===
bad: 153, total: 155
bad rate: 98.709677 %
histogram of events caused bad sequence
acquire: 1
acquired: 0
contended: 0
release: 152
I am using the wireless-testing kernel:
root@linux-test ~# uname -a
Linux linux-test 3.13.0-wl-debug #197 SMP PREEMPT Tue Jan 21 03:19:43 IST 2014
x86_64 GNU/Linux
lockdep is enabled:
root@linux-test ~# zgrep -i lockdep /proc/config.gz
CONFIG_LOCKDEP_SUPPORT=y
CONFIG_LOCKDEP=y
# CONFIG_DEBUG_LOCKDEP is not set
Sujith
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