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mm: remove reclaim and compaction retry approximations

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If per-zone LRU accounting is available then there is no point
approximating whether reclaim and compaction should retry based on pgdat
statistics.  This is effectively a revert of "mm, vmstat: remove zone
and node double accounting by approximating retries" with the difference
that inactive/active stats are still available.  This preserves the
history of why the approximation was retried and why it had to be
reverted to handle OOM kills on 32-bit systems.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Mel Gorman <[email protected]>
Acked-by: Johannes Weiner <[email protected]>
Acked-by: Minchan Kim <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mel Gorman 2016-07-28 15:47:31 -07:00 • committed by Linus Torvalds
commit 5a1c84b404
8 changed files with 39 additions and 58 deletions
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20
mm/compaction.c
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@ -1438,11 +1438,6 @@ bool compaction_zonelist_suitable(struct alloc_context *ac, int order,
{
struct zone *zone;
struct zoneref *z;
pg_data_t *last_pgdat = NULL;
/* Do not retry compaction for zone-constrained allocations */
if (ac->high_zoneidx < ZONE_NORMAL)
return false;
/*
* Make sure at least one zone would pass __compaction_suitable if we continue
@ -1453,27 +1448,14 @@ bool compaction_zonelist_suitable(struct alloc_context *ac, int order,
unsigned long available;
enum compact_result compact_result;
if (last_pgdat == zone->zone_pgdat)
continue;
/*
* This over-estimates the number of pages available for
* reclaim/compaction but walking the LRU would take too
* long. The consequences are that compaction may retry
* longer than it should for a zone-constrained allocation
* request.
*/
last_pgdat = zone->zone_pgdat;
available = pgdat_reclaimable_pages(zone->zone_pgdat) / order;
/*
* Do not consider all the reclaimable memory because we do not
* want to trash just for a single high order allocation which
* is even not guaranteed to appear even if __compaction_suitable
* is happy about the watermark check.
*/
available = zone_reclaimable_pages(zone) / order;
available += zone_page_state_snapshot(zone, NR_FREE_PAGES);
available = min(zone->managed_pages, available);
compact_result = __compaction_suitable(zone, order, alloc_flags,
ac_classzone_idx(ac), available);
if (compact_result != COMPACT_SKIPPED &&