linux-kernel - Re: [RFC PATCH] mm: thp: Add per-mm

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Message-ID: <20140111161125.GA17160@redhat.com>
Date:	Sat, 11 Jan 2014 17:11:25 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	Alex Thorlton <athorlton@....com>, linux-mm@...ck.org,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Rik van Riel <riel@...hat.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andy Lutomirski <luto@...capital.net>,
	Al Viro <viro@...iv.linux.org.uk>,
	Kees Cook <keescook@...omium.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] mm: thp: Add per-mm_struct flag to control THP

On 01/10, Kirill A. Shutemov wrote:
>
> I prefer to fix THP instead of
> adding new knob to disable it.

I agree. But if we have the per-vma MADV/VM_ flags, it looks
natural to also have the per-mm know which affects all vmas.

Besides this allows to control the thp behaviour after exec.

Oleg.

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