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Subject: Re: [PATCH v4 3.0-rc2-tip 2/22]  2: uprobes: Breakground page
 replacement.
From: Peter Zijlstra <peterz@infradead.org>
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Date: Fri, 10 Jun 2011 01:03:32 +0200
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To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>, Linux-mm <linux-mm@kvack.org>, Arnaldo Carvalho de Melo <acme@infradead.org>, Linus Torvalds <torvalds@linux-foundation.org>, Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>, Hugh Dickins <hughd@google.com>, Christoph Hellwig <hch@infradead.org>, Andi Kleen <andi@firstfloor.org>, Thomas Gleixner <tglx@linutronix.de>, Jonathan Corbet <corbet@lwn.net>, Oleg Nesterov <oleg@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, Jim Keniston <jkenisto@linux.vnet.ibm.com>, Roland McGrath <roland@hack.frob.com>, Ananth N Mavinakayanahalli <ananth@in.ibm.com>, LKML <linux-kernel@vger.kernel.org>

On Tue, 2011-06-07 at 18:28 +0530, Srikar Dronamraju wrote:
> +/**
> + * __replace_page - replace page in vma by new page.
> + * based on replace_page in mm/ksm.c
> + *
> + * @vma:      vma that holds the pte pointing to page
> + * @page:     the cowed page we are replacing by kpage
> + * @kpage:    the modified page we replace page by
> + *
> + * Returns 0 on success, -EFAULT on failure.
> + */
> +static int __replace_page(struct vm_area_struct *vma, struct page *page,
> +                                       struct page *kpage)

This is a verbatim copy of mm/ksm.c:replace_page(), I think I can
remember why you did this, but the changelog utterly fails to mention
why we need a second copy of this logic (or anything much at all).

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