linux-kernel - Re: [PATCH akpm] mm: include VM_MIXEDMAP flag in the VM

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Message-ID: <53022580.9010805@redhat.com>
Date:	Mon, 17 Feb 2014 10:06:40 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Daniel Borkmann <dborkman@...hat.com>, akpm@...ux-foundation.org
CC:	linux-kernel@...r.kernel.org, Vlastimil Babka <vbabka@...e.cz>,
	Thomas Hellstrom <thellstrom@...are.com>,
	John David Anglin <dave.anglin@...l.net>,
	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	Carsten Otte <cotte@...ibm.com>,
	Jared Hulbert <jaredeh@...il.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	stable@...r.kernel.org
Subject: Re: [PATCH akpm] mm: include VM_MIXEDMAP flag in the VM_SPECIAL list
 to avoid m(un)locking

On 02/16/2014 09:59 AM, Daniel Borkmann wrote:
> From: Vlastimil Babka <vbabka@...e.cz>

> This patch fixes the issue by adding VM_MIXEDMAP flag to VM_SPECIAL,
> a list of flags that make vma's non-mlockable and non-mergeable.
> The reasoning is that VM_MIXEDMAP vma's are similar to VM_PFNMAP,
> which is already on the VM_SPECIAL list, and both are intended
> for non-LRU pages where mlocking makes no sense anyway. Related
> Lkml discussion can be found in [2].
> 
>  [1] tools/testing/selftests/net/psock_tpacket
>  [2] https://lkml.org/lkml/2014/1/10/427
> 
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> Reported-by: Daniel Borkmann <dborkman@...hat.com>
> Tested-by: Daniel Borkmann <dborkman@...hat.com>
> Cc: Thomas Hellstrom <thellstrom@...are.com>
> Cc: John David Anglin <dave.anglin@...l.net>
> Cc: HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
> Cc: Konstantin Khlebnikov <khlebnikov@...nvz.org>
> Cc: Carsten Otte <cotte@...ibm.com>
> Cc: Jared Hulbert <jaredeh@...il.com>
> Cc: Hannes Frederic Sowa <hannes@...essinduktion.org>
> Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Cc: Rik van Riel <riel@...hat.com>
> Cc: <stable@...r.kernel.org> [3.11.x+]

Acked-by: Rik van Riel <riel@...hat.com>

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