Date: Wed, 30 Jul 2014 12:12:18 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Alexey Kardashevskiy <aik@ozlabs.ru>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
        Rik van Riel <riel@redhat.com>, Mel Gorman <mgorman@suse.de>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Sasha Levin <sasha.levin@oracle.com>,
        Wanpeng Li <liwanp@linux.vnet.ibm.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        =?iso-8859-1?Q?J=F6rn?= Engel <joern@logfs.org>,
        "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
        Davidlohr Bueso <davidlohr@hp.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org,
        Alex Williamson <alex.williamson@redhat.com>,
        Alexander Graf <agraf@suse.de>,
        Michael Ellerman <michael@ellerman.id.au>
Subject: Re: [RFC PATCH] mm: Add helpers for locked_vm
Message-ID: <20140730101218.GG19379@twins.programming.kicks-ass.net>
References: <1406712493-9284-1-git-send-email-aik@ozlabs.ru>
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On Wed, Jul 30, 2014 at 07:28:13PM +1000, Alexey Kardashevskiy wrote:
> This adds 2 helpers to change the locked_vm counter:
> - try_increase_locked_vm - may fail if new locked_vm value will be greater
> than the RLIMIT_MEMLOCK limit;
> - decrease_locked_vm.
>=20
> These will be used by drivers capable of locking memory by userspace
> request. For example, VFIO can use it to check if it can lock DMA memory
> or PPC-KVM can use it to check if it can lock memory for TCE tables.

Urgh no.. have a look here:

lkml.kernel.org/r/20140526145605.016140154@infradead.org

Someone needs to go help with the IB stuff, I got properly lost in
there.

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