From: Andriy Tkachuk <andriy.tkachuk@seagate.com>
To: Minchan Kim <minchan@kernel.org>
Cc: linux-kernel@vger.kernel.org, Mel Gorman <mgorman@suse.de>
Subject: Re: mm: kswapd struggles reclaiming the pages on 64GB server
Date: Mon, 22 Aug 2016 19:10:24 +0100 [thread overview]
Message-ID: <CAK-uSPqbQ7jM=4oz=mzz4UkZKrFyhm2+X9552Cxz2Aj1Aj=aZQ@mail.gmail.com> (raw)
In-Reply-To: <20160818140513.GA2453@blaptop>
Hi Minchan,
That's an interesting idea. Although the counters contradicts the theory:
proc-vmstat-0616-160535.txt nr_active_file 44616
proc-vmstat-0616-160545.txt nr_active_file 43471
proc-vmstat-0616-160555.txt nr_active_file 44477
proc-vmstat-0616-160535.txt nr_inactive_file 55534
proc-vmstat-0616-160545.txt nr_inactive_file 35602
proc-vmstat-0616-160555.txt nr_inactive_file 36108
proc-vmstat-0616-160535.txt pgscan_kswapd_normal 111985367420
proc-vmstat-0616-160545.txt pgscan_kswapd_normal 111996845554
proc-vmstat-0616-160555.txt pgscan_kswapd_normal 112028276639
proc-vmstat-0616-160535.txt pgsteal_kswapd_normal 53817848
proc-vmstat-0616-160545.txt pgsteal_kswapd_normal 53818626
proc-vmstat-0616-160555.txt pgsteal_kswapd_normal 53818637
Anyway, I will give it a try if inactive_ratio=1 (which I'm currently
testing) won't help.
Thank you,
Andriy
On Thu, Aug 18, 2016 at 3:05 PM, Minchan Kim <minchan@kernel.org> wrote:
>
> Currently, VM never reclaims anonymous pages if the number of inactive
> file LRU is greater than one of actice file LRU. Even, it makes
> user tune of vm.swappiness void.
>
> Could you rebuild your kernel? I want to see what happens if we
> remove below part from get_scan_count.
>
> http://lxr.free-electrons.com/source/mm/vmscan.c?v=3.10#L1728
>
> 1727 /*
> 1728 * There is enough inactive page cache, do not reclaim
> 1729 * anything from the anonymous working set right now.
> 1730 */
> 1731 if (!inactive_file_is_low(lruvec)) {
> 1732 scan_balance = SCAN_FILE;
> 1733 goto out;
> 1734 }
>
> Thanks.
next prev parent reply other threads:[~2016-08-22 18:10 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-12 20:52 mm: kswapd struggles reclaiming the pages on 64GB server Andriy Tkachuk
2016-08-17 11:43 ` Michal Hocko
2016-08-22 18:16 ` Andriy Tkachuk
[not found] ` <20160818140513.GA2453@blaptop>
2016-08-18 17:43 ` Andriy Tkachuk
2016-08-22 18:10 ` Andriy Tkachuk [this message]
2016-08-22 18:37 ` Andriy Tkachuk
2016-08-22 22:46 ` Andriy Tkachuk
2016-08-23 15:14 ` Andriy Tkachuk
2016-08-31 13:27 ` Andriy Tkachuk
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