linux-kernel - Re: [PATCH v2] mm/khugepaged: add tracepoint to collapse

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Message-Id: <20221024131706.3d58bd92c332684386c7df13@linux-foundation.org>
Date:   Mon, 24 Oct 2022 13:17:06 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Gautam Menghani <gautammenghani201@...il.com>
Cc:     rostedt@...dmis.org, mhiramat@...nel.org, zokeefe@...gle.com,
        shy828301@...il.com, vbabka@...e.cz, david@...hat.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH v2] mm/khugepaged: add tracepoint to collapse_file()

On Mon, 24 Oct 2022 23:05:58 +0530 Gautam Menghani <gautammenghani201@...il.com> wrote:

> In the file mm/khugepaged.c, a TODO in the function collapse_file() asks
> to add tracepoints. Add the tracepoint named "mm_khugepaged_collapse_file".

This isn't a very satisfying explanation for changing the kernel.  Maybe
the comment is stale are this tracepoint is unneeded.

Please explain afresh how this addition benefits kernel users?