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Date:   Mon, 6 Apr 2020 18:20:35 +0300
From:   "Kirill A. Shutemov" <kirill@shutemov.name>
To:     Zi Yan <ziy@nvidia.com>
Cc:     akpm@linux-foundation.org, Andrea Arcangeli <aarcange@redhat.com>,
        Yang Shi <yang.shi@linux.alibaba.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCHv2 1/8] khugepaged: Add self test
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On Mon, Apr 06, 2020 at 10:59:52AM -0400, Zi Yan wrote:
> I ran this test with all patches from this series applied to Linus’s
> tree, but still see several failures. Is it expected?

[Thanks for catching all my typos]

No. It works fine for me.
Well, occasionally, it fails to swap out a page, but nothing like you have
here.

Could you try to trace it? I used script like below after mounting
tracefs. You may want to comment out all tests but a failing one.

#!/bin/sh -efu

echo > /sys/kernel/tracing/trace
echo 1 > /sys/kernel/tracing/events/huge_memory/enable

while ./khugepaged; do
	echo > /sys/kernel/tracing/trace
done

cat /sys/kernel/tracing/trace

-- 
 Kirill A. Shutemov