Messages in this thread | | | Date | Tue, 10 Apr 2012 10:25:08 +0900 | From | Minchan Kim <> | Subject | Re: mapped pagecache pages vs unmapped pages |
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2012-04-10 오전 9:49, Rik van Riel 쓴 글:
> On 04/09/2012 08:31 PM, Minchan Kim wrote: >> 2012-04-10 오전 8:50, Alexey Ivanov 쓴 글: >> >>> Did you consider making this ratio tunable, at least manually(i.e. >>> via sysctl)? >>> I suppose we are not the only ones with almost-whole-ram-mmaped >>> workload. >> >> Personally, I think it's not good approach. >> It depends on kernel's internal implemenatation which would be changed >> in future as we chagend it at 2.6.28. > > I also believe that a tunable for this is not going to be > a very workable approach, for the simple reason that changing > the value does not make a predictable change in the effectiveness > of working set detection or protection. > >> In my opinion, kernel just should do best effort to keep active working >> set except some critical pages which are code pages. > > Johannes has some experimental code to measure refaults, and > calculate their distance in a multi-zone, multi-cgroup environment. > > That would allow us to predictably place things in the working set > as required. >
Hannes, it can help many people if you post your code. ;)
-- Kind regards, Minchan Kim -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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