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Helge Hafting wrote:
> Böszörményi Zoltán wrote:
>> Hi,>>>> I would like to run some diagnostics on a database>> process and I would like to know what flags it used
>> for opening its files. Is there any way to get this info?
>>>> Thanks in advance,>> Zoltán Böszörményi
>>
> 1. Look at the source code for the database - if you have it.
> 2. Run your database under strace, then search the voluminous
> output for "open" calls and look at the flags.
> 3. Patch your kernel to "printk" information whenever
> someone opens with O_DIRECT.
$ stap -x PID -e 'probe syscall.open { if (target() == pid()) log(argstr) }' \
| grep O_DIRECT
"/net", O_RDONLY|O_DIRECTORY|O_LARGEFILE|O_NONBLOCK
"/net", O_RDONLY|O_DIRECTORY|O_LARGEFILE|O_NONBLOCK
...
http://www.sourceware.org/systemtap
Eugene
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