diff options
| -rw-r--r-- | mm/compaction.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/mm/compaction.c b/mm/compaction.c index b5220f275525..50b31e2ec6cb 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -1922,20 +1922,28 @@ static bool kswapd_is_running(pg_data_t *pgdat) /* * A zone's fragmentation score is the external fragmentation wrt to the - * COMPACTION_HPAGE_ORDER scaled by the zone's size. It returns a value - * in the range [0, 100]. + * COMPACTION_HPAGE_ORDER. It returns a value in the range [0, 100]. + */ +static unsigned int fragmentation_score_zone(struct zone *zone) +{ + return extfrag_for_order(zone, COMPACTION_HPAGE_ORDER); +} + +/* + * A weighted zone's fragmentation score is the external fragmentation + * wrt to the COMPACTION_HPAGE_ORDER scaled by the zone's size. It + * returns a value in the range [0, 100]. * * The scaling factor ensures that proactive compaction focuses on larger * zones like ZONE_NORMAL, rather than smaller, specialized zones like * ZONE_DMA32. For smaller zones, the score value remains close to zero, * and thus never exceeds the high threshold for proactive compaction. */ -static unsigned int fragmentation_score_zone(struct zone *zone) +static unsigned int fragmentation_score_zone_weighted(struct zone *zone) { unsigned long score; - score = zone->present_pages * - extfrag_for_order(zone, COMPACTION_HPAGE_ORDER); + score = zone->present_pages * fragmentation_score_zone(zone); return div64_ul(score, zone->zone_pgdat->node_present_pages + 1); } @@ -1955,7 +1963,7 @@ static unsigned int fragmentation_score_node(pg_data_t *pgdat) struct zone *zone; zone = &pgdat->node_zones[zoneid]; - score += fragmentation_score_zone(zone); + score += fragmentation_score_zone_weighted(zone); } return score; |