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Date:	Wed, 22 Jun 2016 16:40:39 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Mel Gorman <mgorman@...hsingularity.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>, Rik van Riel <riel@...riel.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 19/27] mm: Move vmscan writes and file write accounting
 to the node

On Tue 21-06-16 15:15:58, Mel Gorman wrote:
> As reclaim is now node-based, it follows that page write activity
> due to page reclaim should also be accounted for on the node. For
> consistency, also account page writes and page dirtying on a per-node
> basis.
> 
> After this patch, there are a few remaining zone counters that may
> appear strange but are fine. NUMA stats are still per-zone as this is a
> user-space interface that tools consume. NR_MLOCK, NR_SLAB_*, NR_PAGETABLE,
> NR_KERNEL_STACK and NR_BOUNCE are all allocations that potentially pin
> low memory and cannot trivially be reclaimed on demand. This information
> is still useful for debugging a page allocation failure warning.

As I've said in other patch. I think we will need to provide
/proc/nodeinfo to fill the gap.

> Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
> Acked-by: Vlastimil Babka <vbabka@...e.cz>

Acked-by: Michal Hocko <mhocko@...e.com>

> ---
>  include/linux/mmzone.h           | 8 ++++----
>  include/trace/events/writeback.h | 4 ++--
>  mm/page-writeback.c              | 6 +++---
>  mm/vmscan.c                      | 4 ++--
>  mm/vmstat.c                      | 8 ++++----
>  5 files changed, 15 insertions(+), 15 deletions(-)
> 
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index 9924b46e3a13..9c59b8540cb7 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -121,10 +121,6 @@ enum zone_stat_item {
>  	NR_KERNEL_STACK,
>  	/* Second 128 byte cacheline */
>  	NR_BOUNCE,
> -	NR_VMSCAN_WRITE,
> -	NR_VMSCAN_IMMEDIATE,	/* Prioritise for reclaim when writeback ends */
> -	NR_DIRTIED,		/* page dirtyings since bootup */
> -	NR_WRITTEN,		/* page writings since bootup */
>  #if IS_ENABLED(CONFIG_ZSMALLOC)
>  	NR_ZSPAGES,		/* allocated in zsmalloc */
>  #endif
> @@ -162,6 +158,10 @@ enum node_stat_item {
>  	NR_WRITEBACK_TEMP,	/* Writeback using temporary buffers */
>  	NR_SHMEM,		/* shmem pages (included tmpfs/GEM pages) */
>  	NR_UNSTABLE_NFS,	/* NFS unstable pages */
> +	NR_VMSCAN_WRITE,
> +	NR_VMSCAN_IMMEDIATE,	/* Prioritise for reclaim when writeback ends */
> +	NR_DIRTIED,		/* page dirtyings since bootup */
> +	NR_WRITTEN,		/* page writings since bootup */
>  	NR_VM_NODE_STAT_ITEMS
>  };
>  
> diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
> index c581d9c04ca5..a1002cfede1d 100644
> --- a/include/trace/events/writeback.h
> +++ b/include/trace/events/writeback.h
> @@ -415,8 +415,8 @@ TRACE_EVENT(global_dirty_state,
>  		__entry->nr_dirty	= global_node_page_state(NR_FILE_DIRTY);
>  		__entry->nr_writeback	= global_node_page_state(NR_WRITEBACK);
>  		__entry->nr_unstable	= global_node_page_state(NR_UNSTABLE_NFS);
> -		__entry->nr_dirtied	= global_page_state(NR_DIRTIED);
> -		__entry->nr_written	= global_page_state(NR_WRITTEN);
> +		__entry->nr_dirtied	= global_node_page_state(NR_DIRTIED);
> +		__entry->nr_written	= global_node_page_state(NR_WRITTEN);
>  		__entry->background_thresh = background_thresh;
>  		__entry->dirty_thresh	= dirty_thresh;
>  		__entry->dirty_limit	= global_wb_domain.dirty_limit;
> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index aa9fa1eb8b80..95f38a59f9a0 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -2433,7 +2433,7 @@ void account_page_dirtied(struct page *page, struct address_space *mapping)
>  
>  		mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_DIRTY);
>  		__inc_node_page_state(page, NR_FILE_DIRTY);
> -		__inc_zone_page_state(page, NR_DIRTIED);
> +		__inc_node_page_state(page, NR_DIRTIED);
>  		__inc_wb_stat(wb, WB_RECLAIMABLE);
>  		__inc_wb_stat(wb, WB_DIRTIED);
>  		task_io_account_write(PAGE_SIZE);
> @@ -2521,7 +2521,7 @@ void account_page_redirty(struct page *page)
>  
>  		wb = unlocked_inode_to_wb_begin(inode, &locked);
>  		current->nr_dirtied--;
> -		dec_zone_page_state(page, NR_DIRTIED);
> +		dec_node_page_state(page, NR_DIRTIED);
>  		dec_wb_stat(wb, WB_DIRTIED);
>  		unlocked_inode_to_wb_end(inode, locked);
>  	}
> @@ -2750,7 +2750,7 @@ int test_clear_page_writeback(struct page *page)
>  	if (ret) {
>  		mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_WRITEBACK);
>  		dec_node_page_state(page, NR_WRITEBACK);
> -		inc_zone_page_state(page, NR_WRITTEN);
> +		inc_node_page_state(page, NR_WRITTEN);
>  	}
>  	unlock_page_memcg(page);
>  	return ret;
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 4501a9ab1d3f..1f7c1262c0a3 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -612,7 +612,7 @@ static pageout_t pageout(struct page *page, struct address_space *mapping,
>  			ClearPageReclaim(page);
>  		}
>  		trace_mm_vmscan_writepage(page);
> -		inc_zone_page_state(page, NR_VMSCAN_WRITE);
> +		inc_node_page_state(page, NR_VMSCAN_WRITE);
>  		return PAGE_SUCCESS;
>  	}
>  
> @@ -1111,7 +1111,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
>  				 * except we already have the page isolated
>  				 * and know it's dirty
>  				 */
> -				inc_zone_page_state(page, NR_VMSCAN_IMMEDIATE);
> +				inc_node_page_state(page, NR_VMSCAN_IMMEDIATE);
>  				SetPageReclaim(page);
>  
>  				goto keep_locked;
> diff --git a/mm/vmstat.c b/mm/vmstat.c
> index 32c499251174..b58ceb8c872c 100644
> --- a/mm/vmstat.c
> +++ b/mm/vmstat.c
> @@ -929,10 +929,6 @@ const char * const vmstat_text[] = {
>  	"nr_page_table_pages",
>  	"nr_kernel_stack",
>  	"nr_bounce",
> -	"nr_vmscan_write",
> -	"nr_vmscan_immediate_reclaim",
> -	"nr_dirtied",
> -	"nr_written",
>  #if IS_ENABLED(CONFIG_ZSMALLOC)
>  	"nr_zspages",
>  #endif
> @@ -967,6 +963,10 @@ const char * const vmstat_text[] = {
>  	"nr_writeback_temp",
>  	"nr_shmem",
>  	"nr_unstable",
> +	"nr_vmscan_write",
> +	"nr_vmscan_immediate_reclaim",
> +	"nr_dirtied",
> +	"nr_written",
>  
>  	/* enum writeback_stat_item counters */
>  	"nr_dirty_threshold",
> -- 
> 2.6.4
> 
> --
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-- 
Michal Hocko
SUSE Labs

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