Re: Re: About function __create_file in debugfs

2012-09-10 Thread Jianpeng Ma
On 2012-09-08 23:25 gregkh Wrote: >On Sat, Sep 08, 2012 at 05:41:05PM +0800, Jianpeng Ma wrote: >> Hi: >> At present,i used blktrace to trace block io.But i always met error, >> the message like: >> >BLKTRACESETUP(2) /dev/sdc failed: 2/No such file or directory >> >Thread 0 failed open /sys/

Re: About function __create_file in debugfs

2012-09-08 Thread gregkh
On Sat, Sep 08, 2012 at 05:41:05PM +0800, Jianpeng Ma wrote: > Hi: > At present,i used blktrace to trace block io.But i always met error, > the message like: > >BLKTRACESETUP(2) /dev/sdc failed: 2/No such file or directory > >Thread 0 failed open /sys/kernel/debug/block/(null)/trace0: 2/No s

About function __create_file in debugfs

2012-09-08 Thread Jianpeng Ma
Hi: At present,i used blktrace to trace block io.But i always met error, the message like: >BLKTRACESETUP(2) /dev/sdc failed: 2/No such file or directory >Thread 0 failed open /sys/kernel/debug/block/(null)/trace0: 2/No such file or >directory >Thread 2 failed open /sys/kernel/debug/block