Messages in this thread | | | From | Blaisorblade <> | Subject | Re: [patch 00/14] remap_file_pages protection support | Date | Wed, 3 May 2006 02:26:27 +0200 |
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On Tuesday 02 May 2006 12:21, Arjan van de Ven wrote: > > This will be useful since the VMA lookup at fault time can be a > > bottleneck for some programs (I've received a report about this from > > Ulrich Drepper and I've been told that also Val Henson from Intel is > > interested about this).
> I've not seen much of this if any at all, the various caches that are in > place for these lookups seem to function quite well; what we did see was > glibc's malloc implementation being mistuned resulting in far too many > mmaps than needed (which in turn leads to far too much page zeroing > which is the really expensive part. It's not the vma lookup that is > expensive, it's the page zeroing) Even to this email, I hope Ulrich will answer. -- Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!". Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894) http://www.user-mode-linux.org/~blaisorblade Chiacchiera con i tuoi amici in tempo reale! http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com
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