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mm/vmscan: update stale comments

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Update some comments that became stale since transiton from per-zone to
per-node reclaim.

Link: http://lkml.kernel.org/r/20180315164553.17856-2-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Tejun Heo <tj@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Ryabinin 2018-04-10 16:27:51 -07:00 committed by Linus Torvalds
parent d79f7aa496
commit 894befec4d
1 changed files with 5 additions and 5 deletions
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10
mm/vmscan.c
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@ -926,7 +926,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
(PageSwapCache(page) && (sc->gfp_mask & __GFP_IO)); (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 * reclaim_congested which affects wait_iff_congested. kswapd
* will stall and start writing pages if the tail of the LRU * will stall and start writing pages if the tail of the LRU
* is all dirty unqueued pages. * 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 * as there is no guarantee the dirtying process is throttled in the
* same way balance_dirty_pages() manages. * 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 * of pages under pages flagged for immediate reclaim and stall if any
* are encountered in the nr_immediate check below. * 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)) { 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. * backed by a congested BDI and wait_iff_congested will stall.
*/ */
if (stat.nr_dirty && stat.nr_dirty == stat.nr_congested) 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 * is congested. Allow kswapd to continue until it starts encountering
* unqueued dirty pages or cycling through the LRU too quickly. * 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) { 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. * priorities until we have enough memory freed.
*/ */
do { do {