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    SubjectRe: Better pagecache statistics ?

    Badari Pulavarty <> 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
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      Last update: 2005-12-02 23:18    [W:0.039 / U:15.248 seconds]
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