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-rw-r--r--mm/compaction.c48
-rw-r--r--mm/internal.h2
-rw-r--r--mm/page_alloc.c1
-rw-r--r--mm/vmscan.c12
4 files changed, 36 insertions, 27 deletions
diff --git a/mm/compaction.c b/mm/compaction.c
index f9792ba3537c..1fc6736815e0 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1086,9 +1086,9 @@ static int compact_finished(struct zone *zone, struct compact_control *cc,
/* Compaction run is not finished if the watermark is not met */
watermark = low_wmark_pages(zone);
- watermark += (1 << cc->order);
- if (!zone_watermark_ok(zone, cc->order, watermark, 0, 0))
+ if (!zone_watermark_ok(zone, cc->order, watermark, cc->classzone_idx,
+ cc->alloc_flags))
return COMPACT_CONTINUE;
/* Direct compactor: Is a suitable page free? */
@@ -1114,7 +1114,8 @@ static int compact_finished(struct zone *zone, struct compact_control *cc,
* COMPACT_PARTIAL - If the allocation would succeed without compaction
* COMPACT_CONTINUE - If compaction should run now
*/
-unsigned long compaction_suitable(struct zone *zone, int order)
+unsigned long compaction_suitable(struct zone *zone, int order,
+ int alloc_flags, int classzone_idx)
{
int fragindex;
unsigned long watermark;
@@ -1126,21 +1127,30 @@ unsigned long compaction_suitable(struct zone *zone, int order)
if (order == -1)
return COMPACT_CONTINUE;
+ watermark = low_wmark_pages(zone);
+ /*
+ * If watermarks for high-order allocation are already met, there
+ * should be no need for compaction at all.
+ */
+ if (zone_watermark_ok(zone, order, watermark, classzone_idx,
+ alloc_flags))
+ return COMPACT_PARTIAL;
+
/*
* Watermarks for order-0 must be met for compaction. Note the 2UL.
* This is because during migration, copies of pages need to be
* allocated and for a short time, the footprint is higher
*/
- watermark = low_wmark_pages(zone) + (2UL << order);
- if (!zone_watermark_ok(zone, 0, watermark, 0, 0))
+ watermark += (2UL << order);
+ if (!zone_watermark_ok(zone, 0, watermark, classzone_idx, alloc_flags))
return COMPACT_SKIPPED;
/*
* fragmentation index determines if allocation failures are due to
* low memory or external fragmentation
*
- * index of -1000 implies allocations might succeed depending on
- * watermarks
+ * index of -1000 would imply allocations might succeed depending on
+ * watermarks, but we already failed the high-order watermark check
* index towards 0 implies failure is due to lack of memory
* index towards 1000 implies failure is due to fragmentation
*
@@ -1150,10 +1160,6 @@ unsigned long compaction_suitable(struct zone *zone, int order)
if (fragindex >= 0 && fragindex <= sysctl_extfrag_threshold)
return COMPACT_SKIPPED;
- if (fragindex == -1000 && zone_watermark_ok(zone, order, watermark,
- 0, 0))
- return COMPACT_PARTIAL;
-
return COMPACT_CONTINUE;
}
@@ -1165,7 +1171,8 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
const int migratetype = gfpflags_to_migratetype(cc->gfp_mask);
const bool sync = cc->mode != MIGRATE_ASYNC;
- ret = compaction_suitable(zone, cc->order);
+ ret = compaction_suitable(zone, cc->order, cc->alloc_flags,
+ cc->classzone_idx);
switch (ret) {
case COMPACT_PARTIAL:
case COMPACT_SKIPPED:
@@ -1254,7 +1261,8 @@ out:
}
static unsigned long compact_zone_order(struct zone *zone, int order,
- gfp_t gfp_mask, enum migrate_mode mode, int *contended)
+ gfp_t gfp_mask, enum migrate_mode mode, int *contended,
+ int alloc_flags, int classzone_idx)
{
unsigned long ret;
struct compact_control cc = {
@@ -1264,6 +1272,8 @@ static unsigned long compact_zone_order(struct zone *zone, int order,
.gfp_mask = gfp_mask,
.zone = zone,
.mode = mode,
+ .alloc_flags = alloc_flags,
+ .classzone_idx = classzone_idx,
};
INIT_LIST_HEAD(&cc.freepages);
INIT_LIST_HEAD(&cc.migratepages);
@@ -1295,6 +1305,7 @@ int sysctl_extfrag_threshold = 500;
unsigned long try_to_compact_pages(struct zonelist *zonelist,
int order, gfp_t gfp_mask, nodemask_t *nodemask,
enum migrate_mode mode, int *contended,
+ int alloc_flags, int classzone_idx,
struct zone **candidate_zone)
{
enum zone_type high_zoneidx = gfp_zone(gfp_mask);
@@ -1303,7 +1314,6 @@ unsigned long try_to_compact_pages(struct zonelist *zonelist,
struct zoneref *z;
struct zone *zone;
int rc = COMPACT_DEFERRED;
- int alloc_flags = 0;
int all_zones_contended = COMPACT_CONTENDED_LOCK; /* init for &= op */
*contended = COMPACT_CONTENDED_NONE;
@@ -1312,10 +1322,6 @@ unsigned long try_to_compact_pages(struct zonelist *zonelist,
if (!order || !may_enter_fs || !may_perform_io)
return COMPACT_SKIPPED;
-#ifdef CONFIG_CMA
- if (gfpflags_to_migratetype(gfp_mask) == MIGRATE_MOVABLE)
- alloc_flags |= ALLOC_CMA;
-#endif
/* Compact each zone in the list */
for_each_zone_zonelist_nodemask(zone, z, zonelist, high_zoneidx,
nodemask) {
@@ -1326,7 +1332,7 @@ unsigned long try_to_compact_pages(struct zonelist *zonelist,
continue;
status = compact_zone_order(zone, order, gfp_mask, mode,
- &zone_contended);
+ &zone_contended, alloc_flags, classzone_idx);
rc = max(status, rc);
/*
* It takes at least one zone that wasn't lock contended
@@ -1335,8 +1341,8 @@ unsigned long try_to_compact_pages(struct zonelist *zonelist,
all_zones_contended &= zone_contended;
/* If a normal allocation would succeed, stop compacting */
- if (zone_watermark_ok(zone, order, low_wmark_pages(zone), 0,
- alloc_flags)) {
+ if (zone_watermark_ok(zone, order, low_wmark_pages(zone),
+ classzone_idx, alloc_flags)) {
*candidate_zone = zone;
/*
* We think the allocation will succeed in this zone,
diff --git a/mm/internal.h b/mm/internal.h
index a4f90ba7068e..b643938fcf12 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -168,6 +168,8 @@ struct compact_control {
int order; /* order a direct compactor needs */
const gfp_t gfp_mask; /* gfp mask of a direct compactor */
+ const int alloc_flags; /* alloc flags of a direct compactor */
+ const int classzone_idx; /* zone index of a direct compactor */
struct zone *zone;
int contended; /* Signal need_sched() or lock
* contention detected during
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b7c18f094697..e32121fa2ba9 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2341,6 +2341,7 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
compact_result = try_to_compact_pages(zonelist, order, gfp_mask,
nodemask, mode,
contended_compaction,
+ alloc_flags, classzone_idx,
&last_compact_zone);
current->flags &= ~PF_MEMALLOC;
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 53157e157061..4636d9e822c1 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2249,7 +2249,7 @@ static inline bool should_continue_reclaim(struct zone *zone,
return true;
/* If compaction would go ahead or the allocation would succeed, stop */
- switch (compaction_suitable(zone, sc->order)) {
+ switch (compaction_suitable(zone, sc->order, 0, 0)) {
case COMPACT_PARTIAL:
case COMPACT_CONTINUE:
return false;
@@ -2346,7 +2346,7 @@ static inline bool compaction_ready(struct zone *zone, int order)
* If compaction is not ready to start and allocation is not likely
* to succeed without it, then keep reclaiming.
*/
- if (compaction_suitable(zone, order) == COMPACT_SKIPPED)
+ if (compaction_suitable(zone, order, 0, 0) == COMPACT_SKIPPED)
return false;
return watermark_ok;
@@ -2824,8 +2824,8 @@ static bool zone_balanced(struct zone *zone, int order,
balance_gap, classzone_idx, 0))
return false;
- if (IS_ENABLED(CONFIG_COMPACTION) && order &&
- compaction_suitable(zone, order) == COMPACT_SKIPPED)
+ if (IS_ENABLED(CONFIG_COMPACTION) && order && compaction_suitable(zone,
+ order, 0, classzone_idx) == COMPACT_SKIPPED)
return false;
return true;
@@ -2952,8 +2952,8 @@ static bool kswapd_shrink_zone(struct zone *zone,
* from memory. Do not reclaim more than needed for compaction.
*/
if (IS_ENABLED(CONFIG_COMPACTION) && sc->order &&
- compaction_suitable(zone, sc->order) !=
- COMPACT_SKIPPED)
+ compaction_suitable(zone, sc->order, 0, classzone_idx)
+ != COMPACT_SKIPPED)
testorder = 0;
/*
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-17 02:18:58 +0100