linux-kernel - Re: [PATCH v4] mm: per-thread vma caching

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Message-ID: <CA+55aFwsjHPe4CF009p_L6PyYdP=F2bzi9-Wm5T+O6XPOCS6fg@mail.gmail.com>
Date:	Mon, 3 Mar 2014 19:26:16 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Davidlohr Bueso <davidlohr@...com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Michel Lespinasse <walken@...gle.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	"Norton, Scott J" <scott.norton@...com>,
	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] mm: per-thread vma caching

On Mon, Mar 3, 2014 at 7:13 PM, Davidlohr Bueso <davidlohr@...com> wrote:
>
> Yes, I shortly realized that was silly... but I can say for sure it can
> happen and a quick qemu run confirms it. So I see your point as to
> asking why we need it, so now I'm looking for an explanation in the
> code.

We definitely *do* have users.

One example would be ptrace -> access_process_vm -> __access_remote_vm
-> get_user_pages() -> find_extend_vma() -> find_vma_prev -> find_vma.

                    Linus
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