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Date:	Thu, 22 Apr 2010 02:55:58 +0200 (CEST)
From:	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
To:	linux-kernel@...r.kernel.org
cc:	linux-mm@...r.kernel.org
Subject: swapping when there's a free memory

Hi

I captured this output of vmstat. The machine was freeing cache and 
swapping out pages even when there was a plenty of free memory.

The machine is sparc64 with 1GB RAM with 2.6.34-rc4. This abnormal 
swapping happened during running spadfsck --- a fsck program for a custom 
filesystem that caches most reads in its internal cache --- so it reads 
buffers and allocates memory at the same time.

Note that sparc64 doesn't have any low/high memory zones, so it couldn't 
be explained by filling one zone and needing to allocate pages in it.

This abnormal behavior doesn't happen everytime, it happend about twice 
for many spadfsck attempts.

Mikulas

 1  0  36736 289176 389504  57200    0    0  9776     0  346  292 34 36  0 31
 1  0  36736 260496 402664  57200    0    0 13167     0  459  426 12 41  0 48
 1  0  36736 231936 415464  57200    0    0 12800     0  422  333 22 35  0 44
 1  0  36736 206016 426984  57200    0    0 11520     0  408  319 36 35  0 30
 1  0  36736 193056 432360  57200    0    0  5376     0  240  195 61 18  0 21
*** here it starts unreasonable swappping and cache-trimming
 0  2  59216 200136 429424  47992    0 22528  3216 22528  219  194 55 25  0 20
 1  1  68096 194376 431880  45192    0 8960  4896  8968  311  292 58 34  0  8
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 1  1  74752 179856 438632  43240    0 6656  8456  6656  387  348 36 29  0 36
 2  1  78824 165336 444944  42136    0 4096  7939  4104  400  452 43 27  0 31
 0  2  86368 152736 449416  41008    0 7552  8069  7552  387  376 48 30  0 23
 2  1  94400 159696 434344  38920    0 8064  9624  8072  483  443 30 40  0 31
 2  0 102688 150696 435104  37992    0 8304  7504  8304  355  366 32 27  0 42
 2  2 105768 168696 411672  34816    0 3088  9144  3104  450  416 52 27  0 21
 2  2 111384 183576 394016  34416    8 5640  3640  5728  322  282 62 27  0 11
 1  1 117056 266256 318136  29536  128 5672   136  5688  153  175 54 24  0 22
 2  1 117032 259776 321536  29600  240    0  3697     0  253  259 46 16  0 39
 1  0 117016 243816 329640  29600    0    0  8127     8  399  389 53 35  0 12
 1  0 116968 241536 330800  29600   64    0  1224     0  156  122 70 18  0 12
 1  0 114856 300456 292536  29600   64    0  3264     0  190   99 58 34  0  8
*** here, spadfsck finished
 0  0  54152 736072 132392  29600    0    0     0     0   84   27  0 60 40  0
 0  0  54072 736072 132392  29600    0    0     0     0   30   34  3  0 97  0
 0  1  54064 736640 132392  29632    0    0    32     0   33   51  1  0 93  6
 3  0  54064 731640 132408  32136    0    0  2512     0  219  425 12  7  0 81
 0  1  54064 733112 132432  32536    0    0   432     0  155  311 47 29  0 25
 0  1  54064 732528 132440  32848    0    0   328     0  146  298 43 22  0 36
 1  0  54064 726960 132448  33456    0    0   616     0  152  175 29  7  0 64
 0  1  54064 723840 132448  33856    0    0   400     0  163  136 43  2  0 55
 1  0  54064 720480 132448  34248    0    0   392     0  203  132 45  3  0 52
 0  1  54064 717056 132448  34496    0    0   248     0  137   91 51  1  0 48
 1  0  54064 712632 132456  34840    0    0   352     0  145   70 85  3  0 12
 1  0  54064 710952 132456  34952    0    0   112     0  129   50 92  0  0  8
 1  0  54064 709872 132456  34952    0    0     0     0  123   24 98  2  0  0
 1  0  54064 708792 132456  34952    0    0     0     0  121   24 100  0  0  0
^C
[slunicko:~]#

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