linux-kernel - Re: [PATCH kernel v12 09/34] vfio: powerpc/spapr: Move locked

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Message-ID: <20150609042212.GE11000@voom.redhat.com>
Date:	Tue, 9 Jun 2015 14:22:12 +1000
From:	David Gibson <david@...son.dropbear.id.au>
To:	Alexey Kardashevskiy <aik@...abs.ru>
Cc:	linuxppc-dev@...ts.ozlabs.org,
	Alex Williamson <alex.williamson@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Gavin Shan <gwshan@...ux.vnet.ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	Wei Yang <weiyang@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH kernel v12 09/34] vfio: powerpc/spapr: Move locked_vm
 accounting to helpers

On Fri, Jun 05, 2015 at 04:35:01PM +1000, Alexey Kardashevskiy wrote:
> There moves locked pages accounting to helpers.
> Later they will be reused for Dynamic DMA windows (DDW).
> 
> This reworks debug messages to show the current value and the limit.
> 
> This stores the locked pages number in the container so when unlocking
> the iommu table pointer won't be needed. This does not have an effect
> now but it will with the multiple tables per container as then we will
> allow attaching/detaching groups on fly and we may end up having
> a container with no group attached but with the counter incremented.
> 
> While we are here, update the comment explaining why RLIMIT_MEMLOCK
> might be required to be bigger than the guest RAM. This also prints
> pid of the current process in pr_warn/pr_debug.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
> [aw: for the vfio related changes]
> Acked-by: Alex Williamson <alex.williamson@...hat.com>
> Reviewed-by: David Gibson <david@...son.dropbear.id.au>
> Reviewed-by: Gavin Shan <gwshan@...ux.vnet.ibm.com>
> ---
> Changes:
> v12:
> * added WARN_ON_ONCE() to decrement_locked_vm() for the sake of
> documentation

Reviewed-by: David Gibson <david@...son.dropbear.id.au>

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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