From: Minchan Kim <minchan.kim@gmail.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: linux-mm@kvack.org, Wu Fengguang <fengguang.wu@intel.com>
Subject: Re: Kernel falls apart under light memory pressure (i.e. linking vmlinux)
Date: Sun, 15 May 2011 10:37:58 +0900 [thread overview]
Message-ID: <BANLkTinst+Ryox9VZ-s7gdXKa574XXqt5w@mail.gmail.com> (raw)
In-Reply-To: <20110514174333.GW6008@one.firstfloor.org>
On Sun, May 15, 2011 at 2:43 AM, Andi Kleen <andi@firstfloor.org> wrote:
> Copying back linux-mm.
>
>> Recently, we added following patch.
>> https://lkml.org/lkml/2011/4/26/129
>> If it's a culprit, the patch should solve the problem.
>
> It would be probably better to not do the allocations at all under
> memory pressure. Even if the RA allocation doesn't go into reclaim
Fair enough.
I think we can do it easily now.
If page_cache_alloc_readahead(ie, GFP_NORETRY) is fail, we can adjust
RA window size or turn off a while. The point is that we can use the
fail of __do_page_cache_readahead as sign of memory pressure.
Wu, What do you think?
> it may still "steal" allocations recently freed and needed by other
> actors.
This problem is general thing as well as RA.
But it would be not a big problem in order-0 pages.
If it's a really problem, it might sign we have to increase SWAP_CLUSTER_MAX.
The concern I thought is order-0 allocation happens with other
higher-order reclaims in parallel.
order-0 allocation can steal other's high order pages.
For it, I sent a patch but I didn't have enough time to dig in.
https://lkml.org/lkml/2011/5/2/93
I have a plan to do.
>
> -Andi
> --
> ak@linux.intel.com -- Speaking for myself only.
>
--
Kind regards,
Minchan Kim
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next prev parent reply other threads:[~2011-05-15 1:38 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <BANLkTi=XqROAp2MOgwQXEQjdkLMenh_OTQ@mail.gmail.com>
[not found] ` <m2fwokj0oz.fsf@firstfloor.org>
[not found] ` <BANLkTikhj1C7+HXP_4T-VnJzPefU2d7b3A@mail.gmail.com>
[not found] ` <20110512054631.GI6008@one.firstfloor.org>
[not found] ` <BANLkTi=fk3DUT9cYd2gAzC98c69F6HXX7g@mail.gmail.com>
2011-05-14 15:46 ` Kernel falls apart under light memory pressure (i.e. linking vmlinux) Andrew Lutomirski
2011-05-14 16:53 ` Andi Kleen
[not found] ` <BANLkTik6SS9NH7XVSRBoCR16_5veY0MKBw@mail.gmail.com>
2011-05-14 17:43 ` Andi Kleen
2011-05-15 1:37 ` Minchan Kim [this message]
2011-05-15 15:27 ` Wu Fengguang
2011-05-15 15:59 ` Andrew Lutomirski
2011-05-15 22:58 ` Minchan Kim
2011-05-16 8:51 ` Mel Gorman
2011-05-15 16:12 ` Andrew Lutomirski
2011-05-17 6:00 ` Wu Fengguang
2011-05-17 6:35 ` Minchan Kim
2011-05-17 19:22 ` Andrew Lutomirski
2011-05-18 5:17 ` Minchan Kim
2011-05-19 2:15 ` Andrew Lutomirski
2011-05-19 2:30 ` KAMEZAWA Hiroyuki
2011-05-19 2:41 ` Andrew Lutomirski
2011-05-19 2:54 ` Minchan Kim
2011-05-19 14:16 ` Andrew Lutomirski
2011-05-20 0:17 ` Minchan Kim
2011-05-20 2:58 ` Andrew Lutomirski
2011-05-20 3:12 ` KOSAKI Motohiro
2011-05-20 3:38 ` Andrew Lutomirski
2011-05-20 4:20 ` Minchan Kim
2011-05-20 5:08 ` KAMEZAWA Hiroyuki
2011-05-20 5:36 ` Minchan Kim
2011-05-20 7:43 ` KAMEZAWA Hiroyuki
2011-05-20 10:11 ` Andrea Arcangeli
2011-05-20 14:11 ` Andrew Lutomirski
2011-05-20 15:33 ` Minchan Kim
2011-05-20 16:01 ` Andrew Lutomirski
2011-05-20 16:19 ` Minchan Kim
2011-05-20 18:09 ` Andrew Lutomirski
2011-05-20 18:40 ` Andrew Lutomirski
2011-05-21 12:04 ` KOSAKI Motohiro
2011-05-21 13:34 ` Andrew Lutomirski
2011-05-21 14:14 ` KOSAKI Motohiro
2011-05-21 14:44 ` Minchan Kim
2011-05-22 12:22 ` Andrew Lutomirski
2011-05-22 23:12 ` Minchan Kim
2011-05-23 16:42 ` Andrea Arcangeli
2011-05-23 17:35 ` Mel Gorman
2011-05-24 1:19 ` Andrew Lutomirski
2011-05-24 1:34 ` Minchan Kim
2011-05-24 11:24 ` Andrew Lutomirski
2011-05-24 11:55 ` Andrew Lutomirski
2011-05-25 0:43 ` KOSAKI Motohiro
2011-05-21 14:31 ` Minchan Kim
2011-05-19 14:51 ` Wu Fengguang
2011-05-19 15:00 ` Andrew Lutomirski
2011-05-20 0:20 ` Minchan Kim
2011-05-15 22:40 ` Minchan Kim
2011-05-17 5:52 ` Wu Fengguang
2011-05-17 6:26 ` Minchan Kim
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