linux-kernel - Re: [PATCH v3 08/10] mm: frontswap: add tracing support

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Message-ID: <CAOJsxLHRfkoS7ZN8bC1MYdiAWFkWV9bVNgc_hOerfUiKmFkyAg@mail.gmail.com>
Date:	Mon, 11 Jun 2012 11:33:09 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Sasha Levin <levinsasha928@...il.com>, dan.magenheimer@...cle.com,
	konrad.wilk@...cle.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH v3 08/10] mm: frontswap: add tracing support

On 06/10/2012 07:51 PM, Sasha Levin wrote:
>> Add tracepoints to frontswap API.
>>
>> Signed-off-by: Sasha Levin <levinsasha928@...il.com>

On Mon, Jun 11, 2012 at 9:12 AM, Minchan Kim <minchan@...nel.org> wrote:
> Normally, adding new tracepoint isn't easy without special reason.
> I'm not sure all of frontswap function tracing would be valuable.
> Shsha, Why do you want to add tracing?
> What's scenario you want to use tracing?

Yup, the added tracepoints look more like function tracing. Shouldn't
you use something like kprobes or ftrace/perf for this?
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