Messages in this thread | | | Date | Mon, 11 Jun 2001 16:04:45 -0300 (BRST) | From | Rik van Riel <> | Subject | Re: Break 2.4 VM in five easy steps |
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On Mon, 11 Jun 2001, Maciej Zenczykowski wrote: > On Fri, 8 Jun 2001, Pavel Machek wrote: > > > That modulo is likely slower than dereference. > > > > > + if (count % 256 == 0) { > > You are forgetting that this case should be converted to and 255 > or a plain byte reference by any optimizing compiler
Not relevant.
What matters is that this thing calls schedule() unconditionally every 256th time. Checking current->need_resched will only call schedule if it is needed ... not only that, but it will also call schedule FASTER if it is needed.
regards,
Rik -- Linux MM bugzilla: http://linux-mm.org/bugzilla.shtml
Virtual memory is like a game you can't win; However, without VM there's truly nothing to lose...
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