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Message-ID: <CAJd=RBDbYA4xZRikGtHJvKESdiSE-B4OucZ6vQ+tHCi+hG2+aw@mail.gmail.com>
Date: Wed, 8 Feb 2012 20:34:14 +0800
From: Hillf Danton <dhillf@...il.com>
To: Johannes Stezenbach <js@...21.net>
Cc: Toralf Förster <toralf.foerster@....de>,
linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>,
linux-mm@...ck.org
Subject: Re: swap storm since kernel 3.2.x
2012/2/8 Johannes Stezenbach <js@...21.net>:
> On Wed, Feb 08, 2012 at 09:56:15AM +0100, Toralf Förster wrote:
>>
>> From what I can tell is this:
>> If the system is under heavy I/O load and hasn't too much free RAM (git pull,
>> svn update and RAM consuming BOINC applications) then kernel 3.0.20 handle
>> this somehow while 3.2.x run into a swap storm like.
>
> FWIW, I also saw heavy swapping with 3.2.2 with the
> CONFIG_DEBUG_OBJECTS issue reported here:
> http://lkml.org/lkml/2012/1/30/227
>
> But the thing is that even though SUnreclaim was
> huge there was still 1G MemFree and it swapped heavily
> on idle system when just switching between e.g. Firefox and gvim.
>
> Today I'm running 3.2.4 with CONFIG_DEBUG_OBJECTS disabled
> (but otherwise the same config) and it doesn't swap even
> after a fair amount of I/O:
Hah, looks not related to kswapd directly;)
>
> MemTotal: 3940088 kB
> MemFree: 1024920 kB
> Buffers: 293328 kB
> Cached: 447796 kB
> SwapCached: 24 kB
> Active: 847136 kB
> Inactive: 567200 kB
> Active(anon): 478736 kB
> Inactive(anon): 246744 kB
> Active(file): 368400 kB
> Inactive(file): 320456 kB
> Unevictable: 0 kB
> Mlocked: 0 kB
> SwapTotal: 3903484 kB
> SwapFree: 3903196 kB
> Dirty: 16 kB
> Writeback: 0 kB
> AnonPages: 673192 kB
> Mapped: 40956 kB
> Shmem: 52268 kB
> Slab: 1434188 kB
> SReclaimable: 1367388 kB
> SUnreclaim: 66800 kB
> KernelStack: 1600 kB
> PageTables: 4880 kB
> NFS_Unstable: 0 kB
> Bounce: 0 kB
> WritebackTmp: 0 kB
> CommitLimit: 5873528 kB
> Committed_AS: 1744916 kB
> VmallocTotal: 34359738367 kB
> VmallocUsed: 348116 kB
> VmallocChunk: 34359362739 kB
> DirectMap4k: 12288 kB
> DirectMap2M: 4098048 kB
>
> OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
> 586182 353006 60% 1.74K 32595 18 1043040K ext3_inode_cache
> 289062 170979 59% 0.58K 10706 27 171296K dentry
> 247266 107729 43% 0.42K 13737 18 109896K buffer_head
>
>
And I want to ask kswapd to do less work, the attached diff is
based on 3.2.5, mind to test it with CONFIG_DEBUG_OBJECTS enabled?
Thanks
Hillf
--- a/mm/vmscan.c Wed Feb 8 20:10:14 2012
+++ b/mm/vmscan.c Wed Feb 8 20:15:22 2012
@@ -2113,8 +2113,11 @@ restart:
* with multiple processes reclaiming pages, the total
* freeing target can get unreasonably large.
*/
- if (nr_reclaimed >= nr_to_reclaim && priority < DEF_PRIORITY)
+ if (nr_reclaimed >= nr_to_reclaim) {
+ nr_to_reclaim = 0;
break;
+ }
+ nr_to_reclaim -= nr_reclaimed;
}
blk_finish_plug(&plug);
sc->nr_reclaimed += nr_reclaimed;
@@ -2683,12 +2686,12 @@ static unsigned long balance_pgdat(pg_da
* we want to put equal scanning pressure on each zone.
*/
.nr_to_reclaim = ULONG_MAX,
- .order = order,
.target_mem_cgroup = NULL,
};
struct shrink_control shrink = {
.gfp_mask = sc.gfp_mask,
};
+ sc.order = order = 0;
loop_again:
total_scanned = 0;
sc.nr_reclaimed = 0;
--
--
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