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-rw-r--r--include/linux/compaction.h22
-rw-r--r--include/trace/events/compaction.h12
-rw-r--r--mm/compaction.c13
-rw-r--r--mm/page_alloc.c28
4 files changed, 40 insertions, 35 deletions
diff --git a/include/linux/compaction.h b/include/linux/compaction.h
index 1a02dab16646..0980a6ce4436 100644
--- a/include/linux/compaction.h
+++ b/include/linux/compaction.h
@@ -1,6 +1,18 @@
#ifndef _LINUX_COMPACTION_H
#define _LINUX_COMPACTION_H
+/*
+ * Determines how hard direct compaction should try to succeed.
+ * Lower value means higher priority, analogically to reclaim priority.
+ */
+enum compact_priority {
+ COMPACT_PRIO_SYNC_LIGHT,
+ MIN_COMPACT_PRIORITY = COMPACT_PRIO_SYNC_LIGHT,
+ DEF_COMPACT_PRIORITY = COMPACT_PRIO_SYNC_LIGHT,
+ COMPACT_PRIO_ASYNC,
+ INIT_COMPACT_PRIORITY = COMPACT_PRIO_ASYNC
+};
+
/* Return values for compact_zone() and try_to_compact_pages() */
/* When adding new states, please adjust include/trace/events/compaction.h */
enum compact_result {
@@ -66,7 +78,7 @@ extern int fragmentation_index(struct zone *zone, unsigned int order);
extern enum compact_result try_to_compact_pages(gfp_t gfp_mask,
unsigned int order,
unsigned int alloc_flags, const struct alloc_context *ac,
- enum migrate_mode mode, int *contended);
+ enum compact_priority prio, int *contended);
extern void compact_pgdat(pg_data_t *pgdat, int order);
extern void reset_isolation_suitable(pg_data_t *pgdat);
extern enum compact_result compaction_suitable(struct zone *zone, int order,
@@ -151,14 +163,6 @@ extern void kcompactd_stop(int nid);
extern void wakeup_kcompactd(pg_data_t *pgdat, int order, int classzone_idx);
#else
-static inline enum compact_result try_to_compact_pages(gfp_t gfp_mask,
- unsigned int order, int alloc_flags,
- const struct alloc_context *ac,
- enum migrate_mode mode, int *contended)
-{
- return COMPACT_CONTINUE;
-}
-
static inline void compact_pgdat(pg_data_t *pgdat, int order)
{
}
diff --git a/include/trace/events/compaction.h b/include/trace/events/compaction.h
index 36e2d6fb1360..c2ba402ab256 100644
--- a/include/trace/events/compaction.h
+++ b/include/trace/events/compaction.h
@@ -226,26 +226,26 @@ TRACE_EVENT(mm_compaction_try_to_compact_pages,
TP_PROTO(
int order,
gfp_t gfp_mask,
- enum migrate_mode mode),
+ int prio),
- TP_ARGS(order, gfp_mask, mode),
+ TP_ARGS(order, gfp_mask, prio),
TP_STRUCT__entry(
__field(int, order)
__field(gfp_t, gfp_mask)
- __field(enum migrate_mode, mode)
+ __field(int, prio)
),
TP_fast_assign(
__entry->order = order;
__entry->gfp_mask = gfp_mask;
- __entry->mode = mode;
+ __entry->prio = prio;
),
- TP_printk("order=%d gfp_mask=0x%x mode=%d",
+ TP_printk("order=%d gfp_mask=0x%x priority=%d",
__entry->order,
__entry->gfp_mask,
- (int)__entry->mode)
+ __entry->prio)
);
DECLARE_EVENT_CLASS(mm_compaction_suitable_template,
diff --git a/mm/compaction.c b/mm/compaction.c
index fee1118c8b94..4719a391242f 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1626,7 +1626,7 @@ out:
}
static enum compact_result compact_zone_order(struct zone *zone, int order,
- gfp_t gfp_mask, enum migrate_mode mode, int *contended,
+ gfp_t gfp_mask, enum compact_priority prio, int *contended,
unsigned int alloc_flags, int classzone_idx)
{
enum compact_result ret;
@@ -1636,7 +1636,8 @@ static enum compact_result compact_zone_order(struct zone *zone, int order,
.order = order,
.gfp_mask = gfp_mask,
.zone = zone,
- .mode = mode,
+ .mode = (prio == COMPACT_PRIO_ASYNC) ?
+ MIGRATE_ASYNC : MIGRATE_SYNC_LIGHT,
.alloc_flags = alloc_flags,
.classzone_idx = classzone_idx,
.direct_compaction = true,
@@ -1669,7 +1670,7 @@ int sysctl_extfrag_threshold = 500;
*/
enum compact_result try_to_compact_pages(gfp_t gfp_mask, unsigned int order,
unsigned int alloc_flags, const struct alloc_context *ac,
- enum migrate_mode mode, int *contended)
+ enum compact_priority prio, int *contended)
{
int may_enter_fs = gfp_mask & __GFP_FS;
int may_perform_io = gfp_mask & __GFP_IO;
@@ -1684,7 +1685,7 @@ enum compact_result try_to_compact_pages(gfp_t gfp_mask, unsigned int order,
if (!may_enter_fs || !may_perform_io)
return COMPACT_SKIPPED;
- trace_mm_compaction_try_to_compact_pages(order, gfp_mask, mode);
+ trace_mm_compaction_try_to_compact_pages(order, gfp_mask, prio);
/* Compact each zone in the list */
for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, ac->high_zoneidx,
@@ -1697,7 +1698,7 @@ enum compact_result try_to_compact_pages(gfp_t gfp_mask, unsigned int order,
continue;
}
- status = compact_zone_order(zone, order, gfp_mask, mode,
+ status = compact_zone_order(zone, order, gfp_mask, prio,
&zone_contended, alloc_flags,
ac_classzone_idx(ac));
rc = max(status, rc);
@@ -1731,7 +1732,7 @@ enum compact_result try_to_compact_pages(gfp_t gfp_mask, unsigned int order,
goto break_loop;
}
- if (mode != MIGRATE_ASYNC && (status == COMPACT_COMPLETE ||
+ if (prio != COMPACT_PRIO_ASYNC && (status == COMPACT_COMPLETE ||
status == COMPACT_PARTIAL_SKIPPED)) {
/*
* We think that allocation won't succeed in this zone
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 09ba67487897..26c6fe74f5c5 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3096,7 +3096,7 @@ out:
static struct page *
__alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
unsigned int alloc_flags, const struct alloc_context *ac,
- enum migrate_mode mode, enum compact_result *compact_result)
+ enum compact_priority prio, enum compact_result *compact_result)
{
struct page *page;
int contended_compaction;
@@ -3106,7 +3106,7 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
current->flags |= PF_MEMALLOC;
*compact_result = try_to_compact_pages(gfp_mask, order, alloc_flags, ac,
- mode, &contended_compaction);
+ prio, &contended_compaction);
current->flags &= ~PF_MEMALLOC;
if (*compact_result <= COMPACT_INACTIVE)
@@ -3160,7 +3160,8 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
static inline bool
should_compact_retry(struct alloc_context *ac, int order, int alloc_flags,
- enum compact_result compact_result, enum migrate_mode *migrate_mode,
+ enum compact_result compact_result,
+ enum compact_priority *compact_priority,
int compaction_retries)
{
int max_retries = MAX_COMPACT_RETRIES;
@@ -3171,11 +3172,11 @@ should_compact_retry(struct alloc_context *ac, int order, int alloc_flags,
/*
* compaction considers all the zone as desperately out of memory
* so it doesn't really make much sense to retry except when the
- * failure could be caused by weak migration mode.
+ * failure could be caused by insufficient priority
*/
if (compaction_failed(compact_result)) {
- if (*migrate_mode == MIGRATE_ASYNC) {
- *migrate_mode = MIGRATE_SYNC_LIGHT;
+ if (*compact_priority > MIN_COMPACT_PRIORITY) {
+ (*compact_priority)--;
return true;
}
return false;
@@ -3209,7 +3210,7 @@ should_compact_retry(struct alloc_context *ac, int order, int alloc_flags,
static inline struct page *
__alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
unsigned int alloc_flags, const struct alloc_context *ac,
- enum migrate_mode mode, enum compact_result *compact_result)
+ enum compact_priority prio, enum compact_result *compact_result)
{
*compact_result = COMPACT_SKIPPED;
return NULL;
@@ -3218,7 +3219,7 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
static inline bool
should_compact_retry(struct alloc_context *ac, unsigned int order, int alloc_flags,
enum compact_result compact_result,
- enum migrate_mode *migrate_mode,
+ enum compact_priority *compact_priority,
int compaction_retries)
{
struct zone *zone;
@@ -3473,7 +3474,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
struct page *page = NULL;
unsigned int alloc_flags;
unsigned long did_some_progress;
- enum migrate_mode migration_mode = MIGRATE_SYNC_LIGHT;
+ enum compact_priority compact_priority = DEF_COMPACT_PRIORITY;
enum compact_result compact_result;
int compaction_retries = 0;
int no_progress_loops = 0;
@@ -3525,7 +3526,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
!gfp_pfmemalloc_allowed(gfp_mask)) {
page = __alloc_pages_direct_compact(gfp_mask, order,
alloc_flags, ac,
- MIGRATE_ASYNC,
+ INIT_COMPACT_PRIORITY,
&compact_result);
if (page)
goto got_pg;
@@ -3558,7 +3559,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
* sync compaction could be very expensive, so keep
* using async compaction.
*/
- migration_mode = MIGRATE_ASYNC;
+ compact_priority = INIT_COMPACT_PRIORITY;
}
}
@@ -3624,8 +3625,7 @@ retry:
/* Try direct compaction and then allocating */
page = __alloc_pages_direct_compact(gfp_mask, order, alloc_flags, ac,
- migration_mode,
- &compact_result);
+ compact_priority, &compact_result);
if (page)
goto got_pg;
@@ -3665,7 +3665,7 @@ retry:
*/
if (did_some_progress > 0 &&
should_compact_retry(ac, order, alloc_flags,
- compact_result, &migration_mode,
+ compact_result, &compact_priority,
compaction_retries))
goto retry;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-15 06:55:57 +0000