linux-kernel - RE: [PATCH 11/12] mm, thp, tmpfs: enable thp page cache in tmpfs

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Message-Id: <20131015110905.085B1E0090@blue.fi.intel.com>
Date:	Tue, 15 Oct 2013 14:09:04 +0300 (EEST)
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Ning Qu <quning@...il.com>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Hugh Dickins <hughd@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	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,
	Ning Qu <quning@...gle.com>
Subject: RE: [PATCH 11/12] mm, thp, tmpfs: enable thp page cache in tmpfs

Ning Qu wrote:
> Signed-off-by: Ning Qu <quning@...il.com>
> ---
>  mm/Kconfig | 4 ++--
>  mm/shmem.c | 5 +++++
>  2 files changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 562f12f..4d2f90f 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -428,8 +428,8 @@ config TRANSPARENT_HUGEPAGE_PAGECACHE
>  	help
>  	  Enabling the option adds support hugepages for file-backed
>  	  mappings. It requires transparent hugepage support from
> -	  filesystem side. For now, the only filesystem which supports
> -	  hugepages is ramfs.
> +	  filesystem side. For now, the filesystems which support
> +	  hugepages are: ramfs and tmpfs.
>  
>  config CROSS_MEMORY_ATTACH
>  	bool "Cross Memory Support"
> diff --git a/mm/shmem.c b/mm/shmem.c
> index 75c0ac6..50a3335 100644
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -1672,6 +1672,11 @@ static struct inode *shmem_get_inode(struct super_block *sb, const struct inode
>  			break;
>  		case S_IFREG:
>  			inode->i_mapping->a_ops = &shmem_aops;
> +			/*
> +			 * TODO: make tmpfs pages movable
> +			 */
> +			mapping_set_gfp_mask(inode->i_mapping,
> +					     GFP_TRANSHUGE & ~__GFP_MOVABLE);

Unlike ramfs, tmpfs pages are movable before transparent page cache
patchset.
Making tmpfs pages non-movable looks like a big regression to me. It need
to be fixed before proposing it upstream.

-- 
 Kirill A. Shutemov
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