linux-kernel - Re: [PATCHv2 1/8] khugepaged: Add self test

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Message-ID: <20200406152035.ga7hk6jfaqzvlete@box>
Date:   Mon, 6 Apr 2020 18:20:35 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Zi Yan <ziy@...dia.com>
Cc:     akpm@...ux-foundation.org, Andrea Arcangeli <aarcange@...hat.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCHv2 1/8] khugepaged: Add self test

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