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author | Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com> | 2014-06-05 10:24:27 +0900 |
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committer | Steven Rostedt <rostedt@goodmis.org> | 2014-06-05 12:35:49 -0400 |
commit | 939c7a4f04fcd2162109744e8bf88194948a6e65 (patch) | |
tree | 1429af89b0e9fbff114e23170a5786a7e179cfd7 /sound/i2c/cs8427.c | |
parent | beba4bb096201ceec0e8cfb7ce3172a53015bdaf (diff) | |
download | op-kernel-dev-939c7a4f04fcd2162109744e8bf88194948a6e65.zip op-kernel-dev-939c7a4f04fcd2162109744e8bf88194948a6e65.tar.gz |
tracing: Introduce saved_cmdlines_size file
Introduce saved_cmdlines_size file for changing the number of saved pid-comms.
saved_cmdlines currently stores 128 command names using SAVED_CMDLINES, but
'no-existing processes' names are often lost in saved_cmdlines when we
read the trace data. So, by introducing saved_cmdlines_size file, we can
now change the 128 command names saved to something much larger if needed.
When we write a value to saved_cmdlines_size, the number of the value will
be stored in pid-comm list:
# echo 1024 > /sys/kernel/debug/tracing/saved_cmdlines_size
Here, 1024 command names can be stored. The default number is 128 and the maximum
number is PID_MAX_DEFAULT (=32768 if CONFIG_BASE_SMALL is not set). So, if we
want to avoid losing any command names, we need to set 32768 to
saved_cmdlines_size.
We can read the maximum number of the list:
# cat /sys/kernel/debug/tracing/saved_cmdlines_size
128
Link: http://lkml.kernel.org/p/20140605012427.22115.16173.stgit@yunodevel
Signed-off-by: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'sound/i2c/cs8427.c')
0 files changed, 0 insertions, 0 deletions