Messages in this thread | | | Date | Wed, 20 Nov 2013 09:53:15 +0900 | From | Yoshihiro YUNOMAE <> | Subject | Re: [PATCH -tip 0/2] ftrace: Introduce the new I/F "nr_saved_cmdlines" |
| |
Hi,
Would you review this patch set?
Thanks, Yoshihiro YUNOMAE
(2013/11/08 13:26), Yoshihiro YUNOMAE wrote: > Hi, > > This patch set introduces the new I/F "nr_saved_cmdlines" for increasing > the number of saved cmdlines. Current saved_cmdlines can store just 128 command > names and PIDs, but process names are often lost like <...> when we read trace > data. If the process exists, we can get the name by using ps command. However, > if the process already has not existed, we cannot get the name. > > To solve this issue, we introduce the new I/F "nr_saved_cmdlines" to expand > the max number of saved command line names. This I/F is very simple. > If we write a number to nr_saved_cmdlines, the number of command name will be > stored. And, if we read the I/F, we can get current maximum number of command > name. The default number is 128 which is current default number, so this patch > does not change the usage of memory for saved_cmdlines when we boot kernel. > > Thanks! > > --- > > Yoshihiro YUNOMAE (2): > ftrace: Make saved_cmdlines use seq_read > ftrace: Introduce nr_saved_cmdlines I/F > > > kernel/trace/trace.c | 296 +++++++++++++++++++++++++++++++++++++++++--------- > 1 file changed, 241 insertions(+), 55 deletions(-) >
-- Yoshihiro YUNOMAE Software Platform Research Dept. Linux Technology Center Hitachi, Ltd., Yokohama Research Laboratory E-mail: yoshihiro.yunomae.ez@hitachi.com
| |