[LTP] [PATCH] memcg_lib/memcg_process: Better synchronization of signal USR1

[Joerg Vehlow]

Hi Cyril,

> Hi!
>> Actually this does not work like this, because some of the
>> tests trigger the oom killer and TEST_CHECKPOINT_WAIT calling
>> tst_checkpoint uses ROD. Is it ok to directly call
>>
>> tst_checkpoint wait 10000 "1"
>>
>> and ignore the result here?
> Wouldn't that delay the test for too long?
>
> The default timeout for checkpoints is probably too big.
>
> This problem is quite tricky to get right I guess. Maybe we can watch
> /proc/[pid]/statm for increase data + stack memory.
The timeout is specified on the command line (the 10000) in ms.
We run the test with timeout=1000 now and it works fine. It is simpler 
than thinking about any
other synchronization technique. The additonal wait adds less than 30 
for all tests, that use memcg_process.
>> BTW: Is there no such thing like TST_CHECKPOINT in the new
>> shell test library?
> It does not seem to be there, but these shell functions are just
> wrappers that do check the tst_checkpoint return value, which would be
> fairly easy to add.
I just wondered if I didn't see it

Jörg