linux-kernel - Re: [PATCH] mm/migration: Add trace events for THP migrations

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Message-ID: <20220111015822.GA799985@u2004>
Date:   Tue, 11 Jan 2022 10:58:22 +0900
From:   Naoya Horiguchi <naoya.horiguchi@...ux.dev>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-mm@...ck.org, Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Zi Yan <ziy@...dia.com>,
        Naoya Horiguchi <naoya.horiguchi@....com>,
        John Hubbard <jhubbard@...dia.com>,
        Matthew Wilcox <willy@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/migration: Add trace events for THP migrations

Hi Anshuman,

On Fri, Jan 07, 2022 at 10:29:35AM +0530, Anshuman Khandual wrote:
> This adds two trace events for PMD based THP migration without split. These
> events closely follow the implementation details like setting and removing
> of PMD migration entries, which are essential operations for THP migration.

I often want to check which individual pages are migrated to which places
(or not migrated) for testing, so these new tracepoints could help me.
Maybe these can be much greater if they can handle other types of page
migration for raw pages and hugetlb pages.  Is it hard to cover all such
page migration events?

Thanks,
Naoya Horiguchi