linux-kernel - Re: [RFC v2 PATCH 1/7] thp: remove assumptions on pgtable

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Message-ID: <20120904225632.GN3334@redhat.com>
Date:	Wed, 5 Sep 2012 00:56:33 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Gerald Schaefer <gerald.schaefer@...ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Hugh Dickins <hughd@...gle.com>,
	Hillf Danton <dhillf@...il.com>, linux-kernel@...r.kernel.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [RFC v2 PATCH 1/7] thp: remove assumptions on pgtable_t type

Hi Gerald,

On Wed, Aug 29, 2012 at 05:32:58PM +0200, Gerald Schaefer wrote:
> +#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
> +extern void pgtable_deposit(struct mm_struct *mm, pgtable_t pgtable);
> +#endif

One minor nitpick on the naming of the two functions: considering that
those are global exports, that they can only be used by THP and they
mangle internally with the mm->pmd_huge_pte field (also only defined
if TRANSPARENT_HUGEPAGE=y), a more specific THP naming may be clearer.

If the current prepare_pmd_huge_pte/get_pmd_huge_pte wasn't good other
options could be pgtable_trans_huge_deposit/withdraw.
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