linux-kernel - Re: [PATCH v4 3.0-rc2-tip 2/22] 2: uprobes: Breakground page replacement.

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

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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