Messages in this thread | | | Date | Tue, 14 Dec 2010 11:34:11 +0900 | Subject | Re: [PATCH v4 4/7] Reclaim invalidated page ASAP | From | Minchan Kim <> |
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On Tue, Dec 14, 2010 at 11:07 AM, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote: > On Tue, 14 Dec 2010 00:31:05 +0900 > Minchan Kim <minchan.kim@gmail.com> wrote: > >> Test Environment : >> DRAM : 2G, CPU : Intel(R) Core(TM)2 CPU >> Rsync backup directory size : 16G >> >> rsync version is 3.0.7. >> rsync patch is Ben's fadivse. >> stress scenario do following jobs with parallel. >> >> 1. make all -j4 linux, git clone linux-kernel >> 2. git clone linux-kernel >> 3. rsync src dst >> >> nrns : no-patched rsync + no stress >> prns : patched rsync + no stress >> nrs : no-patched rsync + stress >> prs : patched rsync + stress >> >> pginvalidate : the number of dirty/writeback pages which is invalidated by fadvise >> pgreclaim : pages moved PG_reclaim trick in inactive's tail >> >> In summary, my patch enhances a littie bit about elapsed time in >> memory pressure environment and enhance reclaim effectivness(reclaim/reclaim) >> with x2. It means reclaim latency is short and doesn't evict working set >> pages due to invalidated pages. >> >> Look at reclaim effectivness. Patched rsync enhances x2 about reclaim >> effectiveness and compared to mmotm-12-03, mmotm-12-03-fadvise enhances >> 3 minute about elapsed time in stress environment. >> I think it's due to reduce scanning, reclaim overhead. >> >> In no-stress enviroment, fadivse makes program little bit slow. >> I think because there are many pgfault. I don't know why it happens. >> Could you guess why it happens? >> >> Before futher work, I hope listen opinions. >> Any comment is welcome. >> > > At first, the improvement seems great. Thank you for your effort.
Thanks, Kame.
> >> In no-stress enviroment, fadivse makes program little bit slow. >> I think because there are many pgfault. I don't know why it happens. >> Could you guess why it happens? >> > > Are there no program which accesses a directory rsync'ed ?
Maybe. some programs might have mmaped files. But although it happens, deactivate_page found that and it does nothing so the page can't be reclaimed.
> > Thanks, > -Kame > >
-- 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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