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mm: vmscan: harmonize writeback congestion tracking for nodes & memcgs

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The current writeback congestion tracking has separate flags for kswapd
reclaim (node level) and cgroup limit reclaim (memcg-node level).  This is
unnecessarily complicated: the lruvec is an existing abstraction layer for
that node-memcg intersection.

Introduce lruvec->flags and LRUVEC_CONGESTED.  Then track that at the
reclaim root level, which is either the NUMA node for global reclaim, or
the cgroup-node intersection for cgroup reclaim.

Link: http://lkml.kernel.org/r/20191022144803.302233-9-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Roman Gushchin <guro@fb.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2019-11-30 17:55:52 -08:00 • committed by Linus Torvalds
parent 0f6a5cff43
commit 1b05117df7
3 changed files with 37 additions and 64 deletions
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11
include/linux/mmzone.h
View file

@ -296,6 +296,12 @@ struct zone_reclaim_stat {
unsigned long recent_scanned[2];
};
enum lruvec_flags {
LRUVEC_CONGESTED, /* lruvec has many dirty pages
* backed by a congested BDI
*/
};
struct lruvec {
struct list_head lists[NR_LRU_LISTS];
struct zone_reclaim_stat reclaim_stat;
@ -303,6 +309,8 @@ struct lruvec {
atomic_long_t inactive_age;
/* Refaults at the time of last reclaim cycle */
unsigned long refaults;
/* Various lruvec state flags (enum lruvec_flags) */
unsigned long flags;
#ifdef CONFIG_MEMCG
struct pglist_data *pgdat;
#endif
@ -572,9 +580,6 @@ struct zone {
} ____cacheline_internodealigned_in_smp;
enum pgdat_flags {
PGDAT_CONGESTED, /* pgdat has many dirty pages backed by
* a congested BDI
*/
PGDAT_DIRTY, /* reclaim scanning has recently found
* many dirty file pages at the tail
* of the LRU.