linux-kernel - Re: [PATCH 25/51] writeback: attribute stats to the matching per-cgroup bdi

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Date:	Tue, 30 Jun 2015 16:17:42 +0200
From:	Jan Kara <jack@...e.cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org, jack@...e.cz,
	hch@...radead.org, hannes@...xchg.org,
	linux-fsdevel@...r.kernel.org, vgoyal@...hat.com,
	lizefan@...wei.com, cgroups@...r.kernel.org, linux-mm@...ck.org,
	mhocko@...e.cz, clm@...com, fengguang.wu@...el.com,
	david@...morbit.com, gthelen@...gle.com, khlebnikov@...dex-team.ru
Subject: Re: [PATCH 25/51] writeback: attribute stats to the matching
 per-cgroup bdi_writeback

On Fri 22-05-15 17:13:39, Tejun Heo wrote:
> Until now, all WB_* stats were accounted against the root wb
> (bdi_writeback), now that multiple wb (bdi_writeback) support is in
> place, let's attributes the stats to the respective per-cgroup wb's.
> 
> As no filesystem has FS_CGROUP_WRITEBACK yet, this doesn't lead to
> visible behavior differences.
> 
> v2: Updated for per-inode wb association.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Jens Axboe <axboe@...nel.dk>
> Cc: Jan Kara <jack@...e.cz>

Looks good. You can add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  mm/page-writeback.c | 24 +++++++++++++++---------
>  1 file changed, 15 insertions(+), 9 deletions(-)
> 
> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index 9b95cf8..4d0a9da 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -2130,7 +2130,7 @@ void account_page_cleaned(struct page *page, struct address_space *mapping,
>  	if (mapping_cap_account_dirty(mapping)) {
>  		mem_cgroup_dec_page_stat(memcg, MEM_CGROUP_STAT_DIRTY);
>  		dec_zone_page_state(page, NR_FILE_DIRTY);
> -		dec_wb_stat(&inode_to_bdi(mapping->host)->wb, WB_RECLAIMABLE);
> +		dec_wb_stat(inode_to_wb(mapping->host), WB_RECLAIMABLE);
>  		task_io_account_cancelled_write(PAGE_CACHE_SIZE);
>  	}
>  }
> @@ -2191,10 +2191,13 @@ EXPORT_SYMBOL(__set_page_dirty_nobuffers);
>  void account_page_redirty(struct page *page)
>  {
>  	struct address_space *mapping = page->mapping;
> +
>  	if (mapping && mapping_cap_account_dirty(mapping)) {
> +		struct bdi_writeback *wb = inode_to_wb(mapping->host);
> +
>  		current->nr_dirtied--;
>  		dec_zone_page_state(page, NR_DIRTIED);
> -		dec_wb_stat(&inode_to_bdi(mapping->host)->wb, WB_DIRTIED);
> +		dec_wb_stat(wb, WB_DIRTIED);
>  	}
>  }
>  EXPORT_SYMBOL(account_page_redirty);
> @@ -2373,8 +2376,7 @@ int clear_page_dirty_for_io(struct page *page)
>  		if (TestClearPageDirty(page)) {
>  			mem_cgroup_dec_page_stat(memcg, MEM_CGROUP_STAT_DIRTY);
>  			dec_zone_page_state(page, NR_FILE_DIRTY);
> -			dec_wb_stat(&inode_to_bdi(mapping->host)->wb,
> -				    WB_RECLAIMABLE);
> +			dec_wb_stat(inode_to_wb(mapping->host), WB_RECLAIMABLE);
>  			ret = 1;
>  		}
>  		mem_cgroup_end_page_stat(memcg);
> @@ -2392,7 +2394,8 @@ int test_clear_page_writeback(struct page *page)
>  
>  	memcg = mem_cgroup_begin_page_stat(page);
>  	if (mapping) {
> -		struct backing_dev_info *bdi = inode_to_bdi(mapping->host);
> +		struct inode *inode = mapping->host;
> +		struct backing_dev_info *bdi = inode_to_bdi(inode);
>  		unsigned long flags;
>  
>  		spin_lock_irqsave(&mapping->tree_lock, flags);
> @@ -2402,8 +2405,10 @@ int test_clear_page_writeback(struct page *page)
>  						page_index(page),
>  						PAGECACHE_TAG_WRITEBACK);
>  			if (bdi_cap_account_writeback(bdi)) {
> -				__dec_wb_stat(&bdi->wb, WB_WRITEBACK);
> -				__wb_writeout_inc(&bdi->wb);
> +				struct bdi_writeback *wb = inode_to_wb(inode);
> +
> +				__dec_wb_stat(wb, WB_WRITEBACK);
> +				__wb_writeout_inc(wb);
>  			}
>  		}
>  		spin_unlock_irqrestore(&mapping->tree_lock, flags);
> @@ -2427,7 +2432,8 @@ int __test_set_page_writeback(struct page *page, bool keep_write)
>  
>  	memcg = mem_cgroup_begin_page_stat(page);
>  	if (mapping) {
> -		struct backing_dev_info *bdi = inode_to_bdi(mapping->host);
> +		struct inode *inode = mapping->host;
> +		struct backing_dev_info *bdi = inode_to_bdi(inode);
>  		unsigned long flags;
>  
>  		spin_lock_irqsave(&mapping->tree_lock, flags);
> @@ -2437,7 +2443,7 @@ int __test_set_page_writeback(struct page *page, bool keep_write)
>  						page_index(page),
>  						PAGECACHE_TAG_WRITEBACK);
>  			if (bdi_cap_account_writeback(bdi))
> -				__inc_wb_stat(&bdi->wb, WB_WRITEBACK);
> +				__inc_wb_stat(inode_to_wb(inode), WB_WRITEBACK);
>  		}
>  		if (!PageDirty(page))
>  			radix_tree_tag_clear(&mapping->page_tree,
> -- 
> 2.4.0
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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