Messages in this thread | | | Date | Mon, 09 Oct 2006 11:44:53 +0800 | From | Eugene Teo <> | Subject | Re: How to determine whether a file was opened O_DIRECT? |
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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 -- eteo redhat.com ph: +65 6490 4142 http://www.kernel.org/~eugeneteo gpg fingerprint: 47B9 90F6 AE4A 9C51 37E0 D6E1 EA84 C6A2 58DF 8823
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