linux-kernel - Re: [PATCH 1/2] mm: introduce page reference manipulation functions

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Message-ID: <xa1th9ktg81r.fsf@mina86.com>
Date:	Tue, 10 Nov 2015 16:58:56 +0100
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Joonsoo Kim <js1304@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Minchan Kim <minchan@...nel.org>, Mel Gorman <mgorman@...e.de>,
	Vlastimil Babka <vbabka@...e.cz>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org, Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH 1/2] mm: introduce page reference manipulation functions

On Mon, Nov 09 2015, Joonsoo Kim wrote:
> Success of CMA allocation largely depends on success of migration
> and key factor of it is page reference count. Until now, page reference
> is manipulated by direct calling atomic functions so we cannot follow up
> who and where manipulate it. Then, it is hard to find actual reason
> of CMA allocation failure. CMA allocation should be guaranteed to succeed
> so finding offending place is really important.
>
> In this patch, call sites where page reference is manipulated are converted
> to introduced wrapper function. This is preparation step to add tracepoint
> to each page reference manipulation function. With this facility, we can
> easily find reason of CMA allocation failure. There is no functional change
> in this patch.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Acked-by: Michal Nazarewicz <mina86@...a86.com>

> ---
>  arch/mips/mm/gup.c                                |  2 +-
>  arch/powerpc/mm/mmu_context_hash64.c              |  3 +-
>  arch/powerpc/mm/pgtable_64.c                      |  2 +-
>  arch/x86/mm/gup.c                                 |  2 +-
>  drivers/block/aoe/aoecmd.c                        |  4 +-
>  drivers/net/ethernet/freescale/gianfar.c          |  2 +-
>  drivers/net/ethernet/intel/fm10k/fm10k_main.c     |  2 +-
>  drivers/net/ethernet/intel/igb/igb_main.c         |  2 +-
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c     |  2 +-
>  drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c |  2 +-
>  drivers/net/ethernet/mellanox/mlx4/en_rx.c        |  7 +--
>  drivers/net/ethernet/sun/niu.c                    |  2 +-
>  include/linux/mm.h                                | 21 ++-----
>  include/linux/page_ref.h                          | 76 +++++++++++++++++++++++
>  include/linux/pagemap.h                           | 19 +-----
>  mm/huge_memory.c                                  |  6 +-
>  mm/internal.h                                     |  5 --
>  mm/memory_hotplug.c                               |  4 +-
>  mm/migrate.c                                      | 10 +--
>  mm/page_alloc.c                                   |  6 +-
>  mm/vmscan.c                                       |  6 +-
>  21 files changed, 114 insertions(+), 71 deletions(-)
>  create mode 100644 include/linux/page_ref.h
>

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