linux-kernel - Re: [RFC PATCH] mm: Add helpers for locked

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Message-ID: <20140730101218.GG19379@twins.programming.kicks-ass.net>
Date:	Wed, 30 Jul 2014 12:12:18 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alexey Kardashevskiy <aik@...abs.ru>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Jörn Engel <joern@...fs.org>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Davidlohr Bueso <davidlohr@...com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Alex Williamson <alex.williamson@...hat.com>,
	Alexander Graf <agraf@...e.de>,
	Michael Ellerman <michael@...erman.id.au>
Subject: Re: [RFC PATCH] mm: Add helpers for locked_vm

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.
> 
> 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@...radead.org

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

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