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

[Alexander Egorenkov]

Hi Petr,
Date: Fri, 22 Jan 2021 08:16:41 +0100
Message-ID: <874kj9zbja.fsf@oc8242746057.ibm.com>
X-Trend-IP-HD: ip=[9.171.79.240]sender=(egorenar@linux.ibm.com)recipient=<ltp@lists.linux.it;liwang@redhat.com;pvorel@suse.cz>

Petr Vorel <pvorel@suse.cz> writes:

> Hi Alexander, Li,
>
> First I found quite hard to have correct setup to avoid TCONF "Not enough swap
> space to test". It often requires to add additional swap file via mkswap && swapon
> and use some RAM with:
>
> dd if=/dev/zero of=/dev/shm/fill bs=1k count=14024k
>
> It'd be great if test could do required setup itself.
> And it'd also help at least to print swap_free_init and mem_over_max in that TCONF:
>
>         if (swap_free_init < mem_over_max)
> -               tst_brk(TCONF, "Not enough swap space to test.");
> +               tst_brk(TCONF, "Not enough swap space to test (%ld < %ld)", swap_free_init, mem_over_max);
>

yeah, that was a problem for me too when i was new to this test :/


>
> I tried to debug swapping01 on s390x (without this patch) with using additional
> swap and eat RAM with dd. and got bus error (core dumped). Is that due too
> aggressive memory eating? I'm not able to crash it on intel arch.
>

that's something new for me. If possible please run it in gdb with debug symbols
to find out where exactly this signal is raised.

Regards
Alex