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* zram on ARM
@ 2012-11-02 19:59 Luigi Semenzato
  2012-11-02 20:52 ` Luigi Semenzato
  2012-11-02 22:53 ` Minchan Kim
  0 siblings, 2 replies; 7+ messages in thread
From: Luigi Semenzato @ 2012-11-02 19:59 UTC (permalink / raw)
  To: linux-mm, Nitin Gupta, Seth Jennings

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Does anybody have any information on the status of zram on ARM?
Specifically, how much it has been tested.

I noticed that zram and zsmalloc on ToT no longer have the x86
restriction, and they compile fine on our 3.4 branch.  Sadly, that's
where my luck ends.

When I run my standard Chrome load (which just opens a bunch of
memory-intensive browser tabs), Chrome dies shortly after the system
starts swapping pages out.  For instance, here's are the SI and SO
fields of "vmstat 1":

   si   so
    0    0
    0    0
    0    0
    0    0
    0    0
    0    0
    0    0
    0    0
    0  168
    0    0
    0  924
  188 26332
  520 30672
 1304 32208
 2360 30804
 18836 24832
                     <--- chrome dies here
 6496    0
  892    0
  260    0
    8    0

I also have a simpler load: a program that allocates memory non-stop,
and fills part of it with data from /dev/urandom (to simulate the
observed compressibility). The program never reads its data though, so
it doesn't get swapped back in, as in the previous load.  This runs
for a while and partially fills the swap device, then the system
hangs.

Deja vu, eh?  I am running this with my patch, which may result in
extra OOM kills.  Interestingly, a few threads are blocked in
exit_mm(), but not on a page fault.  Most processes are in
congestion_wait(), so this is probably not the same situation I was
seeing earlier.

Anyway, I am attaching the output of SysRQ-X with lots of stack
traces.  Thank you very much for any information!

Luigi

[-- Attachment #2: console-ramoops58 --]
[-- Type: application/octet-stream, Size: 131072 bytes --]

^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2012-11-05 21:12 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2012-11-02 19:59 zram on ARM Luigi Semenzato
2012-11-02 20:52 ` Luigi Semenzato
2012-11-02 22:53 ` Minchan Kim
2012-11-02 23:27   ` Luigi Semenzato
2012-11-03  0:04     ` Luigi Semenzato
2012-11-03  0:09       ` Luigi Semenzato
2012-11-05 21:12         ` Luigi Semenzato

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