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Date: Tue, 27 May 2014 15:09:26 +0200
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [RFC][PATCH 0/5] VM_PINNED
Message-ID: <20140527130926.GE5444@laptop.programming.kicks-ass.net>
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To: Vlastimil Babka <vbabka@suse.cz>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Christoph Lameter <cl@linux.com>, Thomas Gleixner <tglx@linutronix.de>, Andrew Morton <akpm@linux-foundation.org>, Hugh Dickins <hughd@google.com>, Mel Gorman <mgorman@suse.de>, Roland Dreier <roland@kernel.org>, Sean Hefty <sean.hefty@intel.com>, Hal Rosenstock <hal.rosenstock@gmail.com>, Mike Marciniszyn <infinipath@intel.com>

On Tue, May 27, 2014 at 01:50:47PM +0200, Vlastimil Babka wrote:
> > What if VM_PINNED will require VM_LOCKED?
> > I.e. user must mlock it before pining and cannot munlock vma while it's pinned.
> 
> Mlocking makes sense, as pages won't be uselessly scanned on
> non-evictable LRU, no? (Or maybe I just don't see that something else
> prevents then from being there already).

We can add VM_PINNED logic to page_check_reference() and
try_to_unmap_one() to avoid the scanning if that's a problem. But that's
additional bits.

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