The patch titled
Subject: mm, compaction: remove last_migrated_pfn from compact_control
has been added to the -mm tree. Its filename is
mm-compaction-remove-last_migrated_pfn-from-compact_control.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-compaction-remove-last_migrated_pfn-from-compact_control.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-compaction-remove-last_migrated_pfn-from-compact_control.patch
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------------------------------------------------------
From: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Subject: 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/20190104125011.16071-4-mgorman@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Huang Ying <ying.huang@xxxxxxxxx>
Cc: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/mm/compaction.c~mm-compaction-remove-last_migrated_pfn-from-compact_control
+++ a/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(
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(
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(
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(
*/
goto check_drain;
case ISOLATE_SUCCESS:
+ last_migrated_pfn = start_pfn;
;
}
@@ -1639,8 +1633,7 @@ static enum compact_result compact_zone(
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;
}
}
--- a/mm/internal.h~mm-compaction-remove-last_migrated_pfn-from-compact_control
+++ a/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;
_
Patches currently in -mm which might be from mgorman@xxxxxxxxxxxxxxxxxxx are
mm-page_alloc-do-not-wake-kswapd-with-zone-lock-held.patch
mm-compaction-shrink-compact_control.patch
mm-compaction-rearrange-compact_control.patch
mm-compaction-remove-last_migrated_pfn-from-compact_control.patch
mm-compaction-remove-unnecessary-zone-parameter-in-some-instances.patch
mm-compaction-rename-map_pages-to-split_map_pages.patch
mm-compaction-skip-pageblocks-with-reserved-pages.patch
mm-migrate-immediately-fail-migration-of-a-page-with-no-migration-handler.patch
mm-compaction-always-finish-scanning-of-a-full-pageblock.patch
mm-compaction-use-the-page-allocator-bulk-free-helper-for-lists-of-pages.patch
mm-compaction-ignore-the-fragmentation-avoidance-boost-for-isolation-and-compaction.patch
mm-compaction-use-free-lists-to-quickly-locate-a-migration-source.patch
mm-compaction-keep-migration-source-private-to-a-single-compaction-instance.patch
mm-compaction-use-free-lists-to-quickly-locate-a-migration-target.patch
mm-compaction-avoid-rescanning-the-same-pageblock-multiple-times.patch
mm-compaction-finish-pageblock-scanning-on-contention.patch
mm-compaction-check-early-for-huge-pages-encountered-by-the-migration-scanner.patch
mm-compaction-keep-cached-migration-pfns-synced-for-unusable-pageblocks.patch
mm-compaction-rework-compact_should_abort-as-compact_check_resched.patch
mm-compaction-do-not-consider-a-need-to-reschedule-as-contention.patch
mm-compaction-reduce-unnecessary-skipping-of-migration-target-scanner.patch
mm-compaction-round-robin-the-order-while-searching-the-free-lists-for-a-target.patch
mm-compaction-sample-pageblocks-for-free-pages.patch
mm-compaction-be-selective-about-what-pageblocks-to-clear-skip-hints.patch
mm-compaction-capture-a-page-under-direct-compaction.patch
mm-compaction-do-not-direct-compact-remote-memory.patch
