linux-kernel - Re: [PATCH 2/6] mm/vmscan: Update stale comments

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Message-ID: <20180320150054.GX23100@dhcp22.suse.cz>
Date:   Tue, 20 Mar 2018 16:00:54 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Tejun Heo <tj@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH 2/6] mm/vmscan: Update stale comments

On Thu 15-03-18 19:45:49, Andrey Ryabinin wrote:
> Update some comments that become stale since transiton from per-zone
> to per-node reclaim.
> 
> Signed-off-by: Andrey Ryabinin <aryabinin@...tuozzo.com>

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

> ---
>  mm/vmscan.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 4390a8d5be41..6d74b12099bd 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -926,7 +926,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
>  			(PageSwapCache(page) && (sc->gfp_mask & __GFP_IO));
>  
>  		/*
> -		 * The number of dirty pages determines if a zone is marked
> +		 * The number of dirty pages determines if a node is marked
>  		 * reclaim_congested which affects wait_iff_congested. kswapd
>  		 * will stall and start writing pages if the tail of the LRU
>  		 * is all dirty unqueued pages.
> @@ -1764,7 +1764,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
>  	 * as there is no guarantee the dirtying process is throttled in the
>  	 * same way balance_dirty_pages() manages.
>  	 *
> -	 * Once a zone is flagged ZONE_WRITEBACK, kswapd will count the number
> +	 * Once a node is flagged PGDAT_WRITEBACK, kswapd will count the number
>  	 * of pages under pages flagged for immediate reclaim and stall if any
>  	 * are encountered in the nr_immediate check below.
>  	 */
> @@ -1791,7 +1791,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
>  	 */
>  	if (sane_reclaim(sc)) {
>  		/*
> -		 * Tag a zone as congested if all the dirty pages scanned were
> +		 * Tag a node as congested if all the dirty pages scanned were
>  		 * backed by a congested BDI and wait_iff_congested will stall.
>  		 */
>  		if (stat.nr_dirty && stat.nr_dirty == stat.nr_congested)
> @@ -1812,7 +1812,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
>  	}
>  
>  	/*
> -	 * Stall direct reclaim for IO completions if underlying BDIs or zone
> +	 * Stall direct reclaim for IO completions if underlying BDIs and node
>  	 * is congested. Allow kswapd to continue until it starts encountering
>  	 * unqueued dirty pages or cycling through the LRU too quickly.
>  	 */
> @@ -3808,7 +3808,7 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in
>  
>  	if (node_pagecache_reclaimable(pgdat) > pgdat->min_unmapped_pages) {
>  		/*
> -		 * Free memory by calling shrink zone with increasing
> +		 * Free memory by calling shrink node with increasing
>  		 * priorities until we have enough memory freed.
>  		 */
>  		do {
> -- 
> 2.16.1

-- 
Michal Hocko
SUSE Labs