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Date: Tue, 09 Jun 2015 15:54:53 +0900
From: Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To: Xishi Qiu <qiuxishi@...wei.com>,
Andrew Morton <akpm@...ux-foundation.org>,
nao.horiguchi@...il.com, Yinghai Lu <yinghai@...nel.org>,
"H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>, mingo@...e.hu,
Xiexiuqi <xiexiuqi@...wei.com>,
Hanjun Guo <guohanjun@...wei.com>,
"Luck, Tony" <tony.luck@...el.com>
CC: Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 03/12] mm: introduce MIGRATE_MIRROR to manage the
mirrored, pages
On 2015/06/04 21:58, Xishi Qiu wrote:
> This patch introduces a new MIGRATE_TYPES called "MIGRATE_MIRROR", it is used
> to storage the mirrored pages list.
> When cat /proc/pagetypeinfo, you can see the count of free mirrored blocks.
>
I guess you need to add Mel to CC.
> e.g.
> euler-linux:~ # cat /proc/pagetypeinfo
> Page block order: 9
> Pages per block: 512
>
> Free pages count per migrate type at order 0 1 2 3 4 5 6 7 8 9 10
> Node 0, zone DMA, type Unmovable 1 1 0 0 2 1 1 0 1 0 0
> Node 0, zone DMA, type Reclaimable 0 0 0 0 0 0 0 0 0 0 0
> Node 0, zone DMA, type Movable 0 0 0 0 0 0 0 0 0 0 3
> Node 0, zone DMA, type Mirror 0 0 0 0 0 0 0 0 0 0 0
> Node 0, zone DMA, type Reserve 0 0 0 0 0 0 0 0 0 1 0
> Node 0, zone DMA, type Isolate 0 0 0 0 0 0 0 0 0 0 0
> Node 0, zone DMA32, type Unmovable 0 0 1 0 0 0 0 1 1 1 0
> Node 0, zone DMA32, type Reclaimable 0 0 0 0 0 0 0 0 0 0 0
> Node 0, zone DMA32, type Movable 1 2 6 6 6 4 5 3 3 2 738
> Node 0, zone DMA32, type Mirror 0 0 0 0 0 0 0 0 0 0 0
> Node 0, zone DMA32, type Reserve 0 0 0 0 0 0 0 0 0 0 1
> Node 0, zone DMA32, type Isolate 0 0 0 0 0 0 0 0 0 0 0
> Node 0, zone Normal, type Unmovable 0 0 0 0 0 0 0 0 0 0 0
> Node 0, zone Normal, type Reclaimable 0 0 0 0 0 0 0 0 0 0 0
> Node 0, zone Normal, type Movable 0 0 1 1 0 0 0 2 1 0 4254
> Node 0, zone Normal, type Mirror 148 104 63 70 26 11 2 2 1 1 973
> Node 0, zone Normal, type Reserve 0 0 0 0 0 0 0 0 0 0 1
> Node 0, zone Normal, type Isolate 0 0 0 0 0 0 0 0 0 0 0
>
> Number of blocks type Unmovable Reclaimable Movable Mirror Reserve Isolate
> Node 0, zone DMA 1 0 6 0 1 0
> Node 0, zone DMA32 2 0 1525 0 1 0
> Node 0, zone Normal 0 0 8702 2048 2 0
> Page block order: 9
> Pages per block: 512
>
> Free pages count per migrate type at order 0 1 2 3 4 5 6 7 8 9 10
> Node 1, zone Normal, type Unmovable 0 0 0 0 0 0 0 0 0 0 0
> Node 1, zone Normal, type Reclaimable 0 0 0 0 0 0 0 0 0 0 0
> Node 1, zone Normal, type Movable 2 2 1 1 2 1 2 2 2 3 3996
> Node 1, zone Normal, type Mirror 68 94 57 6 8 1 0 0 3 1 2003
> Node 1, zone Normal, type Reserve 0 0 0 0 0 0 0 0 0 0 1
> Node 1, zone Normal, type Isolate 0 0 0 0 0 0 0 0 0 0 0
>
> Number of blocks type Unmovable Reclaimable Movable Mirror Reserve Isolate
> Node 1, zone Normal 0 0 8190 4096 2 0
>
>
> Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
> ---
> include/linux/mmzone.h | 6 ++++++
> mm/page_alloc.c | 3 +++
> mm/vmstat.c | 3 +++
> 3 files changed, 12 insertions(+)
>
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index 1fae07b..b444335 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -39,6 +39,9 @@ enum {
> MIGRATE_UNMOVABLE,
> MIGRATE_RECLAIMABLE,
> MIGRATE_MOVABLE,
> +#ifdef CONFIG_MEMORY_MIRROR
> + MIGRATE_MIRROR,
> +#endif
I can't imagine how the fallback logic will work at reading this patch.
I think an update for fallback order array should be in this patch...
> MIGRATE_PCPTYPES, /* the number of types on the pcp lists */
> MIGRATE_RESERVE = MIGRATE_PCPTYPES,
> #ifdef CONFIG_CMA
> @@ -82,6 +85,9 @@ struct mirror_info {
> };
>
> extern struct mirror_info mirror_info;
> +# define is_migrate_mirror(migratetype) unlikely((migratetype) == MIGRATE_MIRROR)
> +#else
> +# define is_migrate_mirror(migratetype) false
> #endif
>
> #define for_each_migratetype_order(order, type) \
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 41a95a7..3b2ff46 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -3245,6 +3245,9 @@ static void show_migration_types(unsigned char type)
> [MIGRATE_UNMOVABLE] = 'U',
> [MIGRATE_RECLAIMABLE] = 'E',
> [MIGRATE_MOVABLE] = 'M',
> +#ifdef CONFIG_MEMORY_MIRROR
> + [MIGRATE_MIRROR] = 'O',
> +#endif
> [MIGRATE_RESERVE] = 'R',
> #ifdef CONFIG_CMA
> [MIGRATE_CMA] = 'C',
> diff --git a/mm/vmstat.c b/mm/vmstat.c
> index 4f5cd97..d0323e0 100644
> --- a/mm/vmstat.c
> +++ b/mm/vmstat.c
> @@ -901,6 +901,9 @@ static char * const migratetype_names[MIGRATE_TYPES] = {
> "Unmovable",
> "Reclaimable",
> "Movable",
> +#ifdef CONFIG_MEMORY_MIRROR
> + "Mirror",
> +#endif
> "Reserve",
> #ifdef CONFIG_CMA
> "CMA",
>
--
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