Messages in this thread | | | Subject | Re: [PATCH]: Free pages from local pcp lists under tight memory conditions | From | Rohit Seth <> | Date | Wed, 23 Nov 2005 13:40:48 -0800 |
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On Wed, 2005-11-23 at 13:26 -0800, Andrew Morton wrote: > Rohit Seth <rohit.seth@intel.com> wrote: > > > > > I don't think Martin was able to demonstrate much benefit from the lock > > > contention reduction on 16-way NUMAQ either. > > > > > > So I dithered for months and it was a marginal merge, so it's appropriate > > > to justify the continued presence of the code. > > > > > > > May be the limits on the number of pages hanging on the per_cpu_pagelist > > was (or even now is) too small (for them to give any meaningful gain). > > May be we should have more physical contiguity in each of these pcps to > > give better cache spread. > > Could be. The initial settings were pretty arbitrary - I assumed that > someone would get in and tune them up, but nothing much happened. Perhaps > we should expose the thresholds in /proc/sys/vm so they're easier to play > with.
Most certainly. If I had a patch ready...I would have given you one right away :-) Though I will work on it...
It surely is unfortunate that we have not digged deeper into this area (in terms of optimizations)....
-rohit
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