linux-kernel - Re: [RFC 5/7] LTTng instrumentation mm

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Message-Id: <1195160783.7078.203.camel@localhost>
Date:	Thu, 15 Nov 2007 13:06:23 -0800
From:	Dave Hansen <haveblue@...ibm.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [RFC 5/7] LTTng instrumentation mm

> On Tue, 2007-11-13 at 14:33 -0500, Mathieu Desnoyers wrote:
>  linux-2.6-lttng/mm/page_io.c        2007-11-13 09:49:35.000000000 -0500
> @@ -114,6 +114,7 @@ int swap_writepage(struct page *page, st
>                 rw |= (1 << BIO_RW_SYNC);
>         count_vm_event(PSWPOUT);
>         set_page_writeback(page);
> +       trace_mark(mm_swap_out, "address %p", page_address(page));
>         unlock_page(page);
>         submit_bio(rw, bio);
>  out:

I'm not sure all this page_address() stuff makes any sense on highmem
systems.  How about page_to_pfn()?

I also have to wonder if you should be hooking into count_vm_event() and
using those.  Could you give a high-level overview of exactly why you
need these hooks, and perhaps what you expect from future people adding
things to the VM?

-- Dave

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