Messages in this thread | | | Date | Fri, 19 Nov 2004 20:06:15 -0600 | From | Robin Holt <> | Subject | Re: page fault scalability patch V11 [0/7]: overview |
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On Fri, Nov 19, 2004 at 11:42:39AM -0800, Christoph Lameter wrote: > Note that I have posted two other approaches of dealing with the rss problem: > > A. make_rss_atomic. The earlier releases contained that patch but then another > variable (such as anon_rss) was introduced that would have required additional > atomic operations. Atomic rss operations are also causing slowdowns on > machines with a high number of cpus due to memory contention. > > B. remove_rss. Replace rss with a periodic scan over the vm to determine > rss and additional numbers. This was also discussed on linux-mm and linux-ia64. > The scans while displaying /proc data were undesirable.
Can you run a comparison benchmark between atomic rss and anon_rss and the sloppy rss with the rss and anon_rss in seperate cachelines. I am not sure that it is important to seperate the two into seperate lines, just rss and anon_rss from the lock and sema.
If I have the time over the weekend, I might try this myself. If not, can you give it a try.
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