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mm, page_alloc: wakeup kcompactd even if kswapd cannot free more memory 

Kswapd will not wakeup if per-zone watermarks are not failing or if too
many previous attempts at background reclaim have failed.

This can be true if there is a lot of free memory available.  For high-
order allocations, kswapd is responsible for waking up kcompactd for
background compaction.  If the zone is not below its watermarks or
reclaim has recently failed (lots of free memory, nothing left to
reclaim), kcompactd does not get woken up.

When __GFP_DIRECT_RECLAIM is not allowed, allow kcompactd to still be
woken up even if kswapd will not reclaim.  This allows high-order
allocations, such as thp, to still trigger background compaction even
when the zone has an abundance of free memory.

Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1803111659420.209721@chino.kir.corp.google.com
Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Rientjes 2018-04-05 16:25:16 -07:00 committed by Linus Torvalds
parent 3eda69c92d
commit 5ecd9d403a
5 changed files with 45 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/trace/postprocess/trace-vmscan-postprocess.pl
View File

@ -111,7 +111,7 @@ my $regex_direct_begin_default = 'order=([0-9]*) may_writepage=([0-9]*) gfp_flag
my $regex_direct_end_default = 'nr_reclaimed=([0-9]*)'; my $regex_direct_end_default = 'nr_reclaimed=([0-9]*)';
my $regex_kswapd_wake_default = 'nid=([0-9]*) order=([0-9]*)'; my $regex_kswapd_wake_default = 'nid=([0-9]*) order=([0-9]*)';
my $regex_kswapd_sleep_default = 'nid=([0-9]*)'; my $regex_kswapd_sleep_default = 'nid=([0-9]*)';
my $regex_wakeup_kswapd_default = 'nid=([0-9]*) zid=([0-9]*) order=([0-9]*)'; my $regex_wakeup_kswapd_default = 'nid=([0-9]*) zid=([0-9]*) order=([0-9]*) gfp_flags=([A-Z_|]*)';
my $regex_lru_isolate_default = 'isolate_mode=([0-9]*) classzone_idx=([0-9]*) order=([0-9]*) nr_requested=([0-9]*) nr_scanned=([0-9]*) nr_skipped=([0-9]*) nr_taken=([0-9]*) lru=([a-z_]*)'; my $regex_lru_isolate_default = 'isolate_mode=([0-9]*) classzone_idx=([0-9]*) order=([0-9]*) nr_requested=([0-9]*) nr_scanned=([0-9]*) nr_skipped=([0-9]*) nr_taken=([0-9]*) lru=([a-z_]*)';
my $regex_lru_shrink_inactive_default = 'nid=([0-9]*) nr_scanned=([0-9]*) nr_reclaimed=([0-9]*) nr_dirty=([0-9]*) nr_writeback=([0-9]*) nr_congested=([0-9]*) nr_immediate=([0-9]*) nr_activate=([0-9]*) nr_ref_keep=([0-9]*) nr_unmap_fail=([0-9]*) priority=([0-9]*) flags=([A-Z_|]*)'; my $regex_lru_shrink_inactive_default = 'nid=([0-9]*) nr_scanned=([0-9]*) nr_reclaimed=([0-9]*) nr_dirty=([0-9]*) nr_writeback=([0-9]*) nr_congested=([0-9]*) nr_immediate=([0-9]*) nr_activate=([0-9]*) nr_ref_keep=([0-9]*) nr_unmap_fail=([0-9]*) priority=([0-9]*) flags=([A-Z_|]*)';
my $regex_lru_shrink_active_default = 'lru=([A-Z_]*) nr_scanned=([0-9]*) nr_rotated=([0-9]*) priority=([0-9]*)'; my $regex_lru_shrink_active_default = 'lru=([A-Z_]*) nr_scanned=([0-9]*) nr_rotated=([0-9]*) priority=([0-9]*)';
@ -201,7 +201,7 @@ $regex_kswapd_sleep = generate_traceevent_regex(
$regex_wakeup_kswapd = generate_traceevent_regex( $regex_wakeup_kswapd = generate_traceevent_regex(
"vmscan/mm_vmscan_wakeup_kswapd", "vmscan/mm_vmscan_wakeup_kswapd",
$regex_wakeup_kswapd_default, $regex_wakeup_kswapd_default,
"nid", "zid", "order"); "nid", "zid", "order", "gfp_flags");
$regex_lru_isolate = generate_traceevent_regex( $regex_lru_isolate = generate_traceevent_regex(
"vmscan/mm_vmscan_lru_isolate", "vmscan/mm_vmscan_lru_isolate",
$regex_lru_isolate_default, $regex_lru_isolate_default,

3
include/linux/mmzone.h
View File

@ -776,7 +776,8 @@ static inline bool is_dev_zone(const struct zone *zone)
#include <linux/memory_hotplug.h> #include <linux/memory_hotplug.h>
void build_all_zonelists(pg_data_t *pgdat); void build_all_zonelists(pg_data_t *pgdat);
void wakeup_kswapd(struct zone *zone, int order, enum zone_type classzone_idx); void wakeup_kswapd(struct zone *zone, gfp_t gfp_mask, int order,
enum zone_type classzone_idx);
bool __zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, bool __zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark,
int classzone_idx, unsigned int alloc_flags, int classzone_idx, unsigned int alloc_flags,
long free_pages); long free_pages);

17
include/trace/events/vmscan.h
View File

@ -78,26 +78,29 @@ TRACE_EVENT(mm_vmscan_kswapd_wake,
TRACE_EVENT(mm_vmscan_wakeup_kswapd, TRACE_EVENT(mm_vmscan_wakeup_kswapd,
TP_PROTO(int nid, int zid, int order), TP_PROTO(int nid, int zid, int order, gfp_t gfp_flags),
TP_ARGS(nid, zid, order), TP_ARGS(nid, zid, order, gfp_flags),
TP_STRUCT__entry( TP_STRUCT__entry(
__field( int, nid ) __field( int, nid )
__field( int, zid ) __field( int, zid )
__field( int, order ) __field( int, order )
__field( gfp_t, gfp_flags )
), ),
TP_fast_assign( TP_fast_assign(
__entry->nid = nid; __entry->nid = nid;
__entry->zid = zid; __entry->zid = zid;
__entry->order = order; __entry->order = order;
__entry->gfp_flags = gfp_flags;
), ),
TP_printk("nid=%d zid=%d order=%d", TP_printk("nid=%d zid=%d order=%d gfp_flags=%s",
__entry->nid, __entry->nid,
__entry->zid, __entry->zid,
__entry->order) __entry->order,
show_gfp_flags(__entry->gfp_flags))
); );
DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_begin_template, DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_begin_template,

14
mm/page_alloc.c
View File

@ -3805,16 +3805,18 @@ retry:
return page; return page;
} }
static void wake_all_kswapds(unsigned int order, const struct alloc_context *ac) static void wake_all_kswapds(unsigned int order, gfp_t gfp_mask,
const struct alloc_context *ac)
{ {
struct zoneref *z; struct zoneref *z;
struct zone *zone; struct zone *zone;
pg_data_t *last_pgdat = NULL; pg_data_t *last_pgdat = NULL;
enum zone_type high_zoneidx = ac->high_zoneidx;
for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, high_zoneidx,
ac->high_zoneidx, ac->nodemask) { ac->nodemask) {
if (last_pgdat != zone->zone_pgdat) if (last_pgdat != zone->zone_pgdat)
wakeup_kswapd(zone, order, ac->high_zoneidx); wakeup_kswapd(zone, gfp_mask, order, high_zoneidx);
last_pgdat = zone->zone_pgdat; last_pgdat = zone->zone_pgdat;
} }
} }
@ -4093,7 +4095,7 @@ retry_cpuset:
goto nopage; goto nopage;
if (gfp_mask & __GFP_KSWAPD_RECLAIM) if (gfp_mask & __GFP_KSWAPD_RECLAIM)
wake_all_kswapds(order, ac); wake_all_kswapds(order, gfp_mask, ac);
/* /*
* The adjusted alloc_flags might result in immediate success, so try * The adjusted alloc_flags might result in immediate success, so try
@ -4151,7 +4153,7 @@ retry_cpuset:
retry: retry:
/* Ensure kswapd doesn't accidentally go to sleep as long as we loop */ /* Ensure kswapd doesn't accidentally go to sleep as long as we loop */
if (gfp_mask & __GFP_KSWAPD_RECLAIM) if (gfp_mask & __GFP_KSWAPD_RECLAIM)
wake_all_kswapds(order, ac); wake_all_kswapds(order, gfp_mask, ac);
reserve_flags = __gfp_pfmemalloc_flags(gfp_mask); reserve_flags = __gfp_pfmemalloc_flags(gfp_mask);
if (reserve_flags) if (reserve_flags)

32
mm/vmscan.c
View File

@ -3539,16 +3539,21 @@ kswapd_try_sleep:
} }
/* /*
* A zone is low on free memory, so wake its kswapd task to service it. * A zone is low on free memory or too fragmented for high-order memory. If
* kswapd should reclaim (direct reclaim is deferred), wake it up for the zone's
* pgdat. It will wake up kcompactd after reclaiming memory. If kswapd reclaim
* has failed or is not needed, still wake up kcompactd if only compaction is
* needed.
*/ */
void wakeup_kswapd(struct zone *zone, int order, enum zone_type classzone_idx) void wakeup_kswapd(struct zone *zone, gfp_t gfp_flags, int order,
enum zone_type classzone_idx)
{ {
pg_data_t *pgdat; pg_data_t *pgdat;
if (!managed_zone(zone)) if (!managed_zone(zone))
return; return;
if (!cpuset_zone_allowed(zone, GFP_KERNEL | __GFP_HARDWALL)) if (!cpuset_zone_allowed(zone, gfp_flags))
return; return;
pgdat = zone->zone_pgdat; pgdat = zone->zone_pgdat;
pgdat->kswapd_classzone_idx = kswapd_classzone_idx(pgdat, pgdat->kswapd_classzone_idx = kswapd_classzone_idx(pgdat,
@ -3557,14 +3562,23 @@ void wakeup_kswapd(struct zone *zone, int order, enum zone_type classzone_idx)
if (!waitqueue_active(&pgdat->kswapd_wait)) if (!waitqueue_active(&pgdat->kswapd_wait))
return; return;
/* Hopeless node, leave it to direct reclaim */ /* Hopeless node, leave it to direct reclaim if possible */
if (pgdat->kswapd_failures >= MAX_RECLAIM_RETRIES) if (pgdat->kswapd_failures >= MAX_RECLAIM_RETRIES ||
pgdat_balanced(pgdat, order, classzone_idx)) {
/*
* There may be plenty of free memory available, but it's too
* fragmented for high-order allocations. Wake up kcompactd
* and rely on compaction_suitable() to determine if it's
* needed. If it fails, it will defer subsequent attempts to
* ratelimit its work.
*/
if (!(gfp_flags & __GFP_DIRECT_RECLAIM))
wakeup_kcompactd(pgdat, order, classzone_idx);
return; return;
}
if (pgdat_balanced(pgdat, order, classzone_idx)) trace_mm_vmscan_wakeup_kswapd(pgdat->node_id, classzone_idx, order,
return; gfp_flags);
trace_mm_vmscan_wakeup_kswapd(pgdat->node_id, classzone_idx, order);
wake_up_interruptible(&pgdat->kswapd_wait); wake_up_interruptible(&pgdat->kswapd_wait);
} }