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    SubjectRe: [PATCH 3/3] Quick vmalloc vs kmalloc fix to the case where array size is too large
    On Mon, 13 Jul 2009 20:50:33 -0700
    Paul Menage <menage@google.com> wrote:

    > On Mon, Jul 13, 2009 at 4:49 PM, KAMEZAWA
    > Hiroyuki<kamezawa.hiroyu@jp.fujitsu.com> wrote:
    > > IIUC, this place, .../procs interface is not so important for performance
    > > as to being allowed this ugly conding.
    > >
    >
    > It's not just the calling thread that suffers from the overhead -
    > we've seen performance hits on other processes on a machine due to the
    > TLB-shootdown overhead associated with vmalloc()/vfree().
    >
    Hmm, ok...then, if too much pids, you hit vmalloc()/vfree() problem again.
    So, it's not good idea to use vmalloc/vfree here after all.

    Thanks,
    -Kame



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