From 566e54e113eb2b669f9300db2c2df400cbb06646 Mon Sep 17 00:00:00 2001 From: Mel Gorman Date: Tue, 5 Mar 2019 15:44:32 -0800 Subject: [PATCH] mm, compaction: remove last_migrated_pfn from compact_control The last_migrated_pfn field is a bit dubious as to whether it really helps but either way, the information from it can be inferred without increasing the size of compact_control so remove the field. Link: http://lkml.kernel.org/r/20190118175136.31341-4-mgorman@techsingularity.net Signed-off-by: Mel Gorman Acked-by: Vlastimil Babka Cc: Andrea Arcangeli Cc: Dan Carpenter Cc: David Rientjes Cc: YueHaibing Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/compaction.c | 25 +++++++++---------------- mm/internal.h | 1 - 2 files changed, 9 insertions(+), 17 deletions(-) diff --git a/mm/compaction.c b/mm/compaction.c index c15b4bbc9e9e..e59dd7a7564c 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -886,15 +886,6 @@ isolate_success: cc->nr_migratepages++; nr_isolated++; - /* - * Record where we could have freed pages by migration and not - * yet flushed them to buddy allocator. - * - this is the lowest page that was isolated and likely be - * then freed by migration. - */ - if (!cc->last_migrated_pfn) - cc->last_migrated_pfn = low_pfn; - /* Avoid isolating too much */ if (cc->nr_migratepages == COMPACT_CLUSTER_MAX) { ++low_pfn; @@ -918,7 +909,6 @@ isolate_fail: } putback_movable_pages(&cc->migratepages); cc->nr_migratepages = 0; - cc->last_migrated_pfn = 0; nr_isolated = 0; } @@ -1539,6 +1529,7 @@ static enum compact_result compact_zone(struct zone *zone, struct compact_contro enum compact_result ret; unsigned long start_pfn = zone->zone_start_pfn; unsigned long end_pfn = zone_end_pfn(zone); + unsigned long last_migrated_pfn; const bool sync = cc->mode != MIGRATE_ASYNC; cc->migratetype = gfpflags_to_migratetype(cc->gfp_mask); @@ -1584,7 +1575,7 @@ static enum compact_result compact_zone(struct zone *zone, struct compact_contro cc->whole_zone = true; } - cc->last_migrated_pfn = 0; + last_migrated_pfn = 0; trace_mm_compaction_begin(start_pfn, cc->migrate_pfn, cc->free_pfn, end_pfn, sync); @@ -1593,12 +1584,14 @@ static enum compact_result compact_zone(struct zone *zone, struct compact_contro while ((ret = compact_finished(zone, cc)) == COMPACT_CONTINUE) { int err; + unsigned long start_pfn = cc->migrate_pfn; switch (isolate_migratepages(zone, cc)) { case ISOLATE_ABORT: ret = COMPACT_CONTENDED; putback_movable_pages(&cc->migratepages); cc->nr_migratepages = 0; + last_migrated_pfn = 0; goto out; case ISOLATE_NONE: /* @@ -1608,6 +1601,7 @@ static enum compact_result compact_zone(struct zone *zone, struct compact_contro */ goto check_drain; case ISOLATE_SUCCESS: + last_migrated_pfn = start_pfn; ; } @@ -1639,8 +1633,7 @@ static enum compact_result compact_zone(struct zone *zone, struct compact_contro cc->migrate_pfn = block_end_pfn( cc->migrate_pfn - 1, cc->order); /* Draining pcplists is useless in this case */ - cc->last_migrated_pfn = 0; - + last_migrated_pfn = 0; } } @@ -1652,18 +1645,18 @@ check_drain: * compact_finished() can detect immediately if allocation * would succeed. */ - if (cc->order > 0 && cc->last_migrated_pfn) { + if (cc->order > 0 && last_migrated_pfn) { int cpu; unsigned long current_block_start = block_start_pfn(cc->migrate_pfn, cc->order); - if (cc->last_migrated_pfn < current_block_start) { + if (last_migrated_pfn < current_block_start) { cpu = get_cpu(); lru_add_drain_cpu(cpu); drain_local_pages(zone); put_cpu(); /* No more flushing until we migrate again */ - cc->last_migrated_pfn = 0; + last_migrated_pfn = 0; } } diff --git a/mm/internal.h b/mm/internal.h index 867af5425432..f40d06d70683 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -188,7 +188,6 @@ struct compact_control { unsigned int nr_migratepages; /* Number of pages to migrate */ unsigned long free_pfn; /* isolate_freepages search base */ unsigned long migrate_pfn; /* isolate_migratepages search base */ - unsigned long last_migrated_pfn;/* Not yet flushed page being freed */ struct zone *zone; unsigned long total_migrate_scanned; unsigned long total_free_scanned; -- 2.20.1