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:
console-ramoops58
Description: Binary data