linux-kernel - Re: [PATCH 6/9] rmap: support file THP

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Message-ID: <20151216120002.GA17677@node.shutemov.name>
Date:	Wed, 16 Dec 2015 14:00:02 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Dave Hansen <dave.hansen@...el.com>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	Christoph Lameter <cl@...two.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Jerome Marchand <jmarchan@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 6/9] rmap: support file THP

On Tue, Dec 01, 2015 at 12:56:13PM -0800, Dave Hansen wrote:
> On 11/18/2015 03:25 PM, Kirill A. Shutemov wrote:
> > -void page_add_file_rmap(struct page *page)
> > +void page_add_file_rmap(struct page *page, bool compound)
> 
> I take it we have to pass 'compound' in explicitly because
> PageCompound() could be true, but we don't want to do a compound
> mapping.  This is true for those weirdo sound driver allocations and a
> few other ones, right?

Right. Also more common case will be PTE-mapped THPs as we have now for
anon-THP.

Basically, we mirror what was done for anon rmap interface.

-- 
 Kirill A. Shutemov
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