lkml.org 
[lkml]   [2005]   [Dec]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: Better pagecache statistics ?
From
Date

Badari Pulavarty <pbadari@us.ibm.com> writes:

> > Can't you add hooks to add_to_page_cache/remove_from_page_cache
> > to record pagecache activity ?
>
> In theory, yes. We already maintain info in "mapping->nrpages".
> Trick would be to collect all of them, send them to user space.

If you happened to have a copy of systemtap built, you might run this
script instead of inserting static hooks into your kernel. (The tool
has come some way since the OLS '2005 demo.)

#! stap
probe kernel.function("add_to_page_cache") {
printf("pid %d added pages (%d)\n", pid(), $mapping->nrpages)
}
probe kernel.function("__remove_from_page_cache") {
printf("pid %d removed pages (%d)\n", pid(), $page->mapping->nrpages)
}
- FChE
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-12-02 23:18    [from the cache]
©2003-2011 Jasper Spaans