linux-kernel - Re: [PATCH v11 8/9] hugetlb_cgroup: Add hugetlb

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Date:   Wed, 5 Feb 2020 18:12:37 +0530
From:   Sandipan Das <sandipan@...ux.ibm.com>
To:     Mina Almasry <almasrymina@...gle.com>
Cc:     Mike Kravetz <mike.kravetz@...cle.com>, shuah <shuah@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Greg Thelen <gthelen@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        open list <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH v11 8/9] hugetlb_cgroup: Add hugetlb_cgroup reservation
 tests

Hi,

On 05/02/20 4:03 am, Mina Almasry wrote:
> On Tue, Feb 4, 2020 at 12:36 PM Mina Almasry <almasrymina@...gle.com> wrote:
>>
>> So the problem in this log seems to be that this log line is missing:
>>     echo Waiting for hugetlb memory to reach size $size.
>>
>> The way the test works is that it starts a process that writes the
>> hugetlb memory, then it *should* wait until the memory is written,
>> then it should record the cgroup accounting and kill the process. It
>> seems from your log that the wait doesn't happen, so the test
>> continues before the background process has had time to write the
>> memory properly. Essentially wait_for_hugetlb_memory_to_get_written()
>> never gets called in your log.
>>
>> Can you try this additional attached diff on top of your changes? I
>> attached the diff and pasted the same here, hopefully one works for
>> you:
>> ...
> 
> I got my hands on a machine with 16MB default hugepage size and
> charge_reserved_hugetlb.sh passes now after my changes. Please let me
> know if you still run into issues.
> 

With your updates, the tests are passing. Ran the tests on a ppc64 system
that uses radix MMU (2MB hugepages) and everything passed there as well.

- Sandipan