[LTP] [PATCH 1/1] swapping01: make test more robust

[Alexander Egorenkov]

Hi Li,
Date: Fri, 22 Jan 2021 08:56:45 +0100
Message-ID: <87zh11xv42.fsf@oc8242746057.ibm.com>
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Li Wang <liwang@redhat.com> writes:

> Hi Alex, Petr,
>
> I'm going to apply Alex's patch after a round of testing[1].
> Because giving more time waiting for swap memory to
> settle is no harm to test, at least help to get rid of failures
> observed on LPAR so far.

Great, thank you very much :) I also think it shouldn't make the test
behave worse.

>
> But I still think the swapping01 not very precise to some degree.
> We probably need to rewrite it someday but currently, I have no better
> idea.

100% agree. It is very fragile. I was thinking maybe we could find out
how much swap space is assigned to a *particular* process, maybe something
in /proc/ can be used ?

>
> [1] Running a stress-ng to eat some available memory in the
> background, then swapping01 easily hit the heavy-swap issue.
> This could be proved that it influenced by deamon allocate/free
> memory during testing.
>
> # stress-ng to eat memory after starting swapping01
>

I also observed that with stress-ng.


Regards
Alex