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KOSAKI Motohiro wrote: > Hi > >>> I don't think so. >>> all modern many cpu machine stand on NUMA. >>> it mean following, >>> - if cpu increases, then zone increases, too. >>> >>> if default value increase by #cpus, lock contension dramatically increase >>> on large numa. >>> >>> Have I overlooked anything? >>> >> How about adding something like.. >> == >> CONFIG_SIMULTANEOUS_PAGE_RECLAIMERS >> int >> default 3 >> depends on DEBUG >> help >> This value determines the number of threads which can do page reclaim >> in a zone simultaneously. If this is too big, performance under heavy memory >> pressure will decrease. >> If unsure, use default. >> == >> >> Then, you can get performance reports from people interested in this >> feature in test cycle. > > hm, intersting. > but sysctl parameter is more better, i think. > > OK, I'll add it at next post. I think sysctl should be interesting. The config option provides good documentation, but it is static in nature (requires reboot to change). I wish we could have the best of both worlds. -- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL | |||||||||
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