Messages in this thread | | | Subject | Re: Better pagecache statistics ? | From | (Frank Ch. Eigler) | Date | 02 Dec 2005 17:15:18 -0500 |
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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) }
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