[LTP] [PATCH] tst_pollute_memory(): Set minimal safety margin to 64MB

[Naresh Kamboju]

On Wed, 20 Jan 2021 at 20:35, Cyril Hrubis <chrubis@suse.cz> wrote:
>
> Hi!
> > > > I have applied your patch and rebuilt completely and retested
> > > > ioctl_sg01 test case in a loop on three different devices.
> > > >
> > > > 1 PASS out of 20 runs with overcommit_memory 0 on x86_64.
> > > > 1 PASS out of 20 runs with overcommit_memory 1 on x86_64.
> > > >
> > > > Which means 19 times the test case triggered oom-killer and the test was broken.
> > >
> > > So it looks like 64MB is not enough in your case.
> > >
> > > Does it work with 128MB or 256MB?
> > >
> > > i.e.:
> > >
> > > safety = MAX(4096 * SAFE_SYSCONF(_SC_PAGESIZE), 128 * 1024 * 1024);

After changing to 128MB the test got PASS with overcommit_memory 0 on x86_64.

- Naresh