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authorMel Gorman <mgorman@techsingularity.net>2019-03-06 02:44:32 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-06 08:07:16 +0300
commit566e54e113eb2b669f9300db2c2df400cbb06646 (patch)
treeb6ad6208a5325171a4dbc85d11b36ee8d2ed5787 /mm/compaction.c
parentc5943b9c5312d4fa23175ff146e901b865e4a60a (diff)
downloadlinux-566e54e113eb2b669f9300db2c2df400cbb06646.tar.xz
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 <mgorman@techsingularity.net> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Cc: David Rientjes <rientjes@google.com> Cc: YueHaibing <yuehaibing@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/compaction.c')
-rw-r--r--mm/compaction.c25
1 files changed, 9 insertions, 16 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;
}
}