Messages in this thread |  | | | From | KOSAKI Motohiro <> | | Subject | Re: [RFC-PATCH 0/7] Memory Compaction v1 | | Date | Thu, 21 Jan 2010 12:12:11 +0900 (JST) |
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Hi Mel,
Sorry, I haven't read this patch at all.
> The time differences are marginal but bear in mind that this is an ideal > case of mostly unmapped buffer pages. On nice set of results is between > allocations 13-18 where no pages were reclaimed, some compaction occured > and 300 huge pages were allocated in 0.16 seconds. Furthermore, compaction > allocated a high higher percentage of memory (91% of RAM as huge pages). > > The downside appears to be that the compaction kernel reclaimed even more > pages than the vanilla kernel. However, take the cut-off point of 880 pages > that both kernels succeeded. The vanilla kernel had reclaimed 105132 pages > at that point. The kernel with compaction had reclaimed 59071, less than > half of what the vanilla kernel reclaimed. i.e. the bulk of pages reclaimed > with the compaction kernel were to get from 87% of memory allocated to 91% > as huge pages. > > These results would appear to be an encouraging enough start. > > Comments?
I think "Total pages reclaimed" increasing is not good thing ;) Honestly, I haven't understand why your patch increase reclaimed and the exactly meaning of the your tool's rclm field.
Can you share your mesurement script? May I run the same test?
I like this patch, but I don't like increasing reclaim. I'd like to know this patch require any vmscan change and/or its change mitigate the issue.
Thanks.
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