Re: [patch 00/14] remap_file_pages protection support

From: Valerie Henson
Date: Tue May 16 2006 - 12:31:59 EST

On Tue, May 16, 2006 at 03:51:35PM +0200, Andreas Mohr wrote:
> I cannot offer much other than some random confirmation that from my own
> oprofiling, whatever I did (often running a load test script consisting of
> launching 30 big apps at the same time), find_vma basically always showed up
> very prominently in the list of vmlinux-based code (always ranking within the
> top 4 or 5 kernel hotspots, such as timer interrupts, ACPI idle I/O etc.pp.).
> call-tracing showed it originating from mmap syscalls etc., and AFAIR quite
> some find_vma activity from oprofile itself.

This is important: Which kernel?

The cases I saw it in were in a (now old) SuSE kernel which as it
turns out had old/different vma lookup code.


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