linux-kernel - Re: s390 hugetlb oops with libhugetlbfs test-suite

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Message-Id: <1217951372.5032.21.camel@localhost.localdomain>
Date:	Tue, 05 Aug 2008 17:49:32 +0200
From:	Gerald Schaefer <gerald.schaefer@...ibm.com>
To:	Nishanth Aravamudan <nacc@...ibm.com>
Cc:	schwidefsky@...ibm.com, LKML <linux-kernel@...r.kernel.org>,
	agl@...ibm.com
Subject: Re: s390 hugetlb oops with libhugetlbfs test-suite

On Tue, 2008-07-29 at 14:46 -0700, Nishanth Aravamudan wrote:
> Beyond the counters case, I saw one other issue on s390 (haven't
> confirmed if it happens anywhere else), the icache-hygiene test, when
> run manually a few times, will fail every so often claiming that one of
> the mmap()s returned ENOMEM. I haven't had time to track that down yet,
> but it might be because of the address space layout and the size of the
> hugepage on s390.

I have posted a patch that will fix the counters oops. So far, I could
not reproduce the icache-hygiene problem, did you use hardware large page
support or software emulation? But I probably noticed a similar one:

map_high_truncate_2 (32):       FAIL    mmap() 1: Cannot allocate memory

That one should be because of the 31-bit address space layout on s390,
as it tries to mmap too much (1.5GB).

I also noticed that task-size-overrun (64) seems to hang up on my system,
I can only continue after ctrl+c, can you verify that?

Thanks,
Gerald


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