linux-kernel - Re: [4/4] powerpc/mm: Split hash page table sizing heuristic into a helper

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Message-ID: <20160301232601.GL5427@voom.redhat.com>
Date:	Wed, 2 Mar 2016 10:26:01 +1100
From:	David Gibson <david@...son.dropbear.id.au>
To:	Michael Ellerman <mpe@...erman.id.au>
Cc:	paulus@...ba.org, benh@...nel.crashing.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [4/4] powerpc/mm: Split hash page table sizing heuristic into a
 helper

On Wed, Mar 02, 2016 at 09:21:19AM +1100, Michael Ellerman wrote:
> On Tue, 2016-09-02 at 03:32:43 UTC, David Gibson wrote:
> > htab_get_table_size() either retrieve the size of the hash page table (HPT)
> > from the device tree - if the HPT size is determined by firmware - or
> > uses a heuristic to determine a good size based on RAM size if the kernel
> > is responsible for allocating the HPT.
> > 
> > To support a PAPR extension allowing resizing of the HPT, we're going to
> > want the memory size -> HPT size logic elsewhere, so split it out into a
> > helper function.
> > 
> > Signed-off-by: David Gibson <david@...son.dropbear.id.au>
> > Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
> 
> Applied to powerpc next, thanks.
> 
> https://git.kernel.org/powerpc/c/5c3c7ede2bdcb85fa2fd51c814
> 
> I reworded one comment a little, from:
> 
> 	/* 2^11 PTEGS / 2^18 bytes is the minimum htab size permitted
> 	 * by the architecture */
> 
> to:
> 	/*
> 	 * 2^11 PTEGS of 128 bytes each, ie. 2^18 bytes is the minimum htab
> 	 * size permitted by the architecture.
> 	 */
> 
> To avoid any confusion about the "/" referring to division.

Good call, thanks.

-- 
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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