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author | Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com> | 2014-02-20 17:44:31 +0900 |
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committer | Steven Rostedt <rostedt@goodmis.org> | 2014-05-29 23:08:07 -0400 |
commit | 42584c81c5adc1737a6fe0687facc5e62a5dc8c1 (patch) | |
tree | 25dbedd93aa7618d436495cce800627cf1761d8e /REPORTING-BUGS | |
parent | 81dc9f0ef21e40114cc895894c7acf3055f6d1fb (diff) | |
download | op-kernel-dev-42584c81c5adc1737a6fe0687facc5e62a5dc8c1.zip op-kernel-dev-42584c81c5adc1737a6fe0687facc5e62a5dc8c1.tar.gz |
tracing: Have saved_cmdlines use the seq_read infrastructure
Current tracing_saved_cmdlines_read() implementation is naive; It allocates
a large buffer, constructs output data to that buffer for each read
operation, and then copies a portion of the buffer to the user space
buffer. This has several issues such as slow memory allocation, high
CPU usage, and even corruption of the output data.
The seq_read infrastructure is made to handle this type of work.
By converting it to use seq_read() the code becomes smaller, simplified,
as well as correct.
Link: http://lkml.kernel.org/p/20140220084431.3839.51793.stgit@yunodevel
Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'REPORTING-BUGS')
0 files changed, 0 insertions, 0 deletions