linux-kernel - Re: [PATCH 02/12] mm, thp, tmpfs: support to add huge page into page cache for tmpfs

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Message-Id: <20131016122611.69CA0E0090@blue.fi.intel.com>
Date:	Wed, 16 Oct 2013 15:26:11 +0300 (EEST)
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Ning Qu <quning@...gle.com>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Hillf Danton <dhillf@...il.com>, Dave Hansen <dave@...1.net>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/12] mm, thp, tmpfs: support to add huge page into page
 cache for tmpfs

Ning Qu wrote:
> Yes, I can try. The code is pretty much similar with some minor difference.
> 
> One thing I can do is to move the spin lock part (together with the
> corresponding err handling into a common function.
> 
> The only problem I can see right now is we need the following
> additional line for shm:
> 
> __mod_zone_page_state(page_zone(page), NR_SHMEM, nr);
> 
> Which means we need to tell if it's coming from shm or not, is that OK
> to add additional parameter just for that? Or is there any other
> better way we can infer that information? Thanks!

I think you can account NR_SHMEM after common code succeed, don't you?

-- 
 Kirill A. Shutemov
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