mm: compaction: add trace events for memory compaction activity
[linux-2.6.git] / mm / compaction.c
index 1a8894e..20011a8 100644 (file)
@@ -16,6 +16,9 @@
 #include <linux/sysfs.h>
 #include "internal.h"
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/compaction.h>
+
 /*
  * compact_control is used to track pages being migrated and the free pages
  * they are being migrated to during memory compaction. The free_pfn starts
@@ -60,7 +63,7 @@ static unsigned long isolate_freepages_block(struct zone *zone,
                                struct list_head *freelist)
 {
        unsigned long zone_end_pfn, end_pfn;
-       int total_isolated = 0;
+       int nr_scanned = 0, total_isolated = 0;
        struct page *cursor;
 
        /* Get the last PFN we should scan for free pages at */
@@ -81,6 +84,7 @@ static unsigned long isolate_freepages_block(struct zone *zone,
 
                if (!pfn_valid_within(blockpfn))
                        continue;
+               nr_scanned++;
 
                if (!PageBuddy(page))
                        continue;
@@ -100,6 +104,7 @@ static unsigned long isolate_freepages_block(struct zone *zone,
                }
        }
 
+       trace_mm_compaction_isolate_freepages(nr_scanned, total_isolated);
        return total_isolated;
 }
 
@@ -234,6 +239,7 @@ static unsigned long isolate_migratepages(struct zone *zone,
                                        struct compact_control *cc)
 {
        unsigned long low_pfn, end_pfn;
+       unsigned long nr_scanned = 0, nr_isolated = 0;
        struct list_head *migratelist = &cc->migratepages;
 
        /* Do not scan outside zone boundaries */
@@ -266,6 +272,7 @@ static unsigned long isolate_migratepages(struct zone *zone,
                struct page *page;
                if (!pfn_valid_within(low_pfn))
                        continue;
+               nr_scanned++;
 
                /* Get the page and skip if free */
                page = pfn_to_page(low_pfn);
@@ -280,6 +287,7 @@ static unsigned long isolate_migratepages(struct zone *zone,
                del_page_from_lru_list(zone, page, page_lru(page));
                list_add(&page->lru, migratelist);
                cc->nr_migratepages++;
+               nr_isolated++;
 
                /* Avoid isolating too much */
                if (cc->nr_migratepages == COMPACT_CLUSTER_MAX)
@@ -291,6 +299,8 @@ static unsigned long isolate_migratepages(struct zone *zone,
        spin_unlock_irq(&zone->lru_lock);
        cc->migrate_pfn = low_pfn;
 
+       trace_mm_compaction_isolate_migratepages(nr_scanned, nr_isolated);
+
        return cc->nr_migratepages;
 }
 
@@ -401,6 +411,8 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
                count_vm_events(COMPACTPAGES, nr_migrate - nr_remaining);
                if (nr_remaining)
                        count_vm_events(COMPACTPAGEFAILED, nr_remaining);
+               trace_mm_compaction_migratepages(nr_migrate - nr_remaining,
+                                               nr_remaining);
 
                /* Release LRU pages not migrated */
                if (!list_empty(&cc->migratepages)) {