vmscan: tracing: add trace events for LRU page isolation

[net-next-2.6.git] / mm / vmscan.c

diff --git a/mm/vmscan.c b/mm/vmscan.c
index c99bc418c4cf033559fa4fe274a10cdd2d8ea6c3..3d006d91a526a8dc36daff4a06e8b11acb201558 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -919,6 +919,9 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
                unsigned long *scanned, int order, int mode, int file)
 {
        unsigned long nr_taken = 0;
+       unsigned long nr_lumpy_taken = 0;
+       unsigned long nr_lumpy_dirty = 0;
+       unsigned long nr_lumpy_failed = 0;
        unsigned long scan;
 
        for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) {
@@ -996,12 +999,25 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
                                list_move(&cursor_page->lru, dst);
                                mem_cgroup_del_lru(cursor_page);
                                nr_taken++;
+                               nr_lumpy_taken++;
+                               if (PageDirty(cursor_page))
+                                       nr_lumpy_dirty++;
                                scan++;
+                       } else {
+                               if (mode == ISOLATE_BOTH &&
+                                               page_count(cursor_page))
+                                       nr_lumpy_failed++;
                        }
                }
        }
 
        *scanned = scan;
+
+       trace_mm_vmscan_lru_isolate(order,
+                       nr_to_scan, scan,
+                       nr_taken,
+                       nr_lumpy_taken, nr_lumpy_dirty, nr_lumpy_failed,
+                       mode);
        return nr_taken;
 }