Re: mm: kswapd struggles reclaiming the pages on 64GB server

[Andriy Tkachuk]

On Mon, Aug 22, 2016 at 7:37 PM, Andriy Tkachuk
<andriy.tkachuk@xxxxxxxxxxx> wrote:
>
> The following patch resolved the problem:
> ...

Sorry, I was too hurry in sending good news. As appeared - the problem
is still there:

06:10:01 PM  pgpgin/s pgpgout/s   fault/s  majflt/s  pgfree/s
pgscank/s pgscand/s pgsteal/s    %vmeff
06:20:01 PM     78.72 1408298.79   3394.73      0.54 384043.36
204.96     10.88    148.06     68.60
06:30:01 PM     51.71 1408936.46   3101.97      0.31 384366.70
211.51     19.30    148.59     64.38
06:40:01 PM     65.29 1366755.43   3506.76      0.65 372628.96
383.94     27.11    154.71     37.64
06:50:01 PM     66.89 1376770.04   3544.59      0.78 375676.38
344.94     12.48    149.84     41.92
07:00:01 PM     15.87 1364029.92   3030.66      0.31 371903.73
307.63     13.32    132.75     41.36
07:10:01 PM    134.24 1370087.74   3397.32      1.06 373435.85
394.16     21.16    166.62     40.12
07:20:01 PM     95.27 1379686.06   3462.59      0.74 376050.98
356.59     29.23    159.00     41.21
07:30:01 PM     12.66 1392306.35   2929.64      0.25 379662.45
395.07     28.66    138.58     32.71
07:40:01 PM    142.06 1368613.00   3486.30      0.98 372912.77
575.74     40.40    174.45     28.31
07:50:02 PM    119.77 1389287.62   3562.60      1.02 378661.56
584.00     29.36    167.92     27.38
08:00:01 PM      7.31 1368140.71   3082.65      0.50 372828.37
711.84     58.08    130.82     16.99
08:10:01 PM    174.74 1381379.24   3529.78      1.65 376567.77
1023.07     46.96    182.60     17.07
08:20:01 PM    205.05 1353845.50   3546.95      1.88 368828.37
1807.24     57.29    183.46      9.84
08:30:01 PM     86.50 1375125.95   3182.56      1.41 374676.32
10590.52    217.62    148.83      1.38
08:40:01 PM    359.38 1345209.72   4185.55      3.45 366630.54
1419665.54  43307.32    220.06      0.02
08:50:01 PM    277.27 1324076.64   3889.98      2.51 360915.41
1779132.87    410.38    200.49      0.01
09:00:02 PM     96.48 1364092.11   3235.53      1.69 372031.87
1973266.99    167.74    163.43      0.01
09:10:01 PM    298.87 1324763.68   3914.11      2.90 360957.82
1772066.29    435.17    204.08      0.01

And I also see the inactive file list bigger than the active file:

# cat /proc/vmstat | egrep
'Cached|nr_.*active_|pgsteal_.*_normal|pgscan_kswapd_normal|pgrefill_normal|nr_vmscan_write|nr_swap|pgact'
nr_inactive_anon 695534
nr_active_anon 14427464
nr_inactive_file 2786
nr_active_file 2698
nr_vmscan_write 1740097
pgactivate 115697891
pgrefill_normal 33345818
pgsteal_kswapd_normal 367908859
pgsteal_direct_normal 681266
pgscan_kswapd_normal 10255454426

So it looks like the time to check Minchan's patch really (disable the
check that inactive file list is bigger than active file)...

  Andriy