Determining number of page faults caused by paging out

Determining number of page faults caused by paging out

[John Daniels]

Hi,

I sent this message to kernelnewbies, but no one
responded so I thought I'd see if anyone here could
help me. Is there a way to determine the number of
page faults which occur because a certain page has
been paged out to disk and then back into memory (i.e.
page faults that would have been avoided if the VM
subsystem didn't swap the page to disk)? I know that
major page faults are the ones that require reading
the page from disk, but I think major page faults
would count the pages being brought into memory for
the first time also. I don't think pgpgin gives me
what I want either, though I'm not sure. Maybe I will
need to instrument the kernel to get this information?
I'm sorry if this is too basic a question for this
list.

Thanks,
John


 
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Re: Determining number of page faults caused by paging out

[Rik van Riel]

John Daniels wrote:
> Hi,
> 
> I sent this message to kernelnewbies, but no one
> responded so I thought I'd see if anyone here could
> help me. Is there a way to determine the number of
> page faults which occur because a certain page has
> been paged out to disk and then back into memory (i.e.
> page faults that would have been avoided if the VM
> subsystem didn't swap the page to disk)?

You'll need my /proc/refaults patches for that.

See my paper on measuring resource demand, and the
patches (which I am forward porting, though I keep
getting distracted by other stuff):

http://people.redhat.com/riel/riel-OLS2006.pdf

http://surriel.com/patches/clockpro/

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