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mm, compaction: remove last_migrated_pfn from compact_control

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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>
This commit is contained in:
Mel Gorman 2019-03-05 15:44:32 -08:00 committed by Linus Torvalds
parent c5943b9c53
commit 566e54e113
2 changed files with 9 additions and 17 deletions
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25
mm/compaction.c
View File

@ -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;
}
}

1
mm/internal.h
View File

@ -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;