Re: How to determine whether a file was opened O_DIRECT?

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.

Helge Hafting
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