Re: Need help tracing regular write activity in 5 s interval

[Matthias Andree]

On Sun, 02 Jun 2002, Thunder from the hill wrote:

> Hi,
> 
> > So: is there any trace software that can tell me "at 15:52:43.012345,
> > process 4321 marked 7 blocks dirty on device /dev/hda5" (or even more
> > detail so I can figure if it's just an atime update -- as with svscan --
> > or a write access)? And that is NOT to be attached to a specific process
> > (hint: strace is not an option).
> 
> Problem: we'd have to do that using printk. printk issues another write 
> call, which will mark things dirty. Issued is another printk, which marks 
> things dirty and issues another printk...

Need not be printk, I can also imagine allocating a buffer, switching
this trace on, exempting the tracer from bein traced, and switching the
trace off if the buffer is full.