Measuring page faults
From: Mike Gagnon
Date: Fri Nov 20 2009 - 09:06:40 EST
Hi all,
I would like to measure the latency (execution time) of Linux page
faults. I tried using lmbench, but I get unrealistically fast results
from the lmbench lat_pagefault benchmark. The problem seems to be
that lmbench attempts to ensure pages are paged out using msync with
the MS_INVALIDATE flag set, but this doesn't seem to cause page outs
on Linux. http://www.bitmover.com/lmbench/lat_pagefault.8.html
I would like to adapt lmbench to correctly measure page faults on
Linux, but I need a mechanism to ensure specific pages are paged-out.
Is there a good way to reliably cause page-outs in Linux (so that I
may then cause page faults by touching the paged-out pages)?
Thanks,
Michael Gagnon
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/