summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorMel Gorman <mel@csn.ul.ie>2010-08-09 17:19:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-09 20:44:59 -0700
commit33906bc5c87b50028364405ec425de9638afc719 (patch)
treed5d6f431bd517a4a914972f3ce968dc99de73694
parentc6a8a8c589b53f90854a07db3b5806ce111e826b (diff)
downloadop-kernel-dev-33906bc5c87b50028364405ec425de9638afc719.zip
op-kernel-dev-33906bc5c87b50028364405ec425de9638afc719.tar.gz
vmscan: tracing: add trace events for kswapd wakeup, sleeping and direct reclaim
Add two trace events for kswapd waking up and going asleep for the purposes of tracking kswapd activity and two trace events for direct reclaim beginning and ending. The information can be used to work out how much time a process or the system is spending on the reclamation of pages and in the case of direct reclaim, how many pages were reclaimed for that process. High frequency triggering of these events could point to memory pressure problems. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Larry Woodman <lwoodman@redhat.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Chris Mason <chris.mason@oracle.com> Cc: Nick Piggin <npiggin@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Christoph Hellwig <hch@infradead.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Michael Rubin <mrubin@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/trace/events/gfpflags.h37
-rw-r--r--include/trace/events/kmem.h38
-rw-r--r--include/trace/events/vmscan.h115
-rw-r--r--mm/vmscan.c24
4 files changed, 173 insertions, 41 deletions
diff --git a/include/trace/events/gfpflags.h b/include/trace/events/gfpflags.h
new file mode 100644
index 0000000..e3615c0
--- /dev/null
+++ b/include/trace/events/gfpflags.h
@@ -0,0 +1,37 @@
+/*
+ * The order of these masks is important. Matching masks will be seen
+ * first and the left over flags will end up showing by themselves.
+ *
+ * For example, if we have GFP_KERNEL before GFP_USER we wil get:
+ *
+ * GFP_KERNEL|GFP_HARDWALL
+ *
+ * Thus most bits set go first.
+ */
+#define show_gfp_flags(flags) \
+ (flags) ? __print_flags(flags, "|", \
+ {(unsigned long)GFP_HIGHUSER_MOVABLE, "GFP_HIGHUSER_MOVABLE"}, \
+ {(unsigned long)GFP_HIGHUSER, "GFP_HIGHUSER"}, \
+ {(unsigned long)GFP_USER, "GFP_USER"}, \
+ {(unsigned long)GFP_TEMPORARY, "GFP_TEMPORARY"}, \
+ {(unsigned long)GFP_KERNEL, "GFP_KERNEL"}, \
+ {(unsigned long)GFP_NOFS, "GFP_NOFS"}, \
+ {(unsigned long)GFP_ATOMIC, "GFP_ATOMIC"}, \
+ {(unsigned long)GFP_NOIO, "GFP_NOIO"}, \
+ {(unsigned long)__GFP_HIGH, "GFP_HIGH"}, \
+ {(unsigned long)__GFP_WAIT, "GFP_WAIT"}, \
+ {(unsigned long)__GFP_IO, "GFP_IO"}, \
+ {(unsigned long)__GFP_COLD, "GFP_COLD"}, \
+ {(unsigned long)__GFP_NOWARN, "GFP_NOWARN"}, \
+ {(unsigned long)__GFP_REPEAT, "GFP_REPEAT"}, \
+ {(unsigned long)__GFP_NOFAIL, "GFP_NOFAIL"}, \
+ {(unsigned long)__GFP_NORETRY, "GFP_NORETRY"}, \
+ {(unsigned long)__GFP_COMP, "GFP_COMP"}, \
+ {(unsigned long)__GFP_ZERO, "GFP_ZERO"}, \
+ {(unsigned long)__GFP_NOMEMALLOC, "GFP_NOMEMALLOC"}, \
+ {(unsigned long)__GFP_HARDWALL, "GFP_HARDWALL"}, \
+ {(unsigned long)__GFP_THISNODE, "GFP_THISNODE"}, \
+ {(unsigned long)__GFP_RECLAIMABLE, "GFP_RECLAIMABLE"}, \
+ {(unsigned long)__GFP_MOVABLE, "GFP_MOVABLE"} \
+ ) : "GFP_NOWAIT"
+
diff --git a/include/trace/events/kmem.h b/include/trace/events/kmem.h
index 3adca0c..a9c87ad 100644
--- a/include/trace/events/kmem.h
+++ b/include/trace/events/kmem.h
@@ -6,43 +6,7 @@
#include <linux/types.h>
#include <linux/tracepoint.h>
-
-/*
- * The order of these masks is important. Matching masks will be seen
- * first and the left over flags will end up showing by themselves.
- *
- * For example, if we have GFP_KERNEL before GFP_USER we wil get:
- *
- * GFP_KERNEL|GFP_HARDWALL
- *
- * Thus most bits set go first.
- */
-#define show_gfp_flags(flags) \
- (flags) ? __print_flags(flags, "|", \
- {(unsigned long)GFP_HIGHUSER_MOVABLE, "GFP_HIGHUSER_MOVABLE"}, \
- {(unsigned long)GFP_HIGHUSER, "GFP_HIGHUSER"}, \
- {(unsigned long)GFP_USER, "GFP_USER"}, \
- {(unsigned long)GFP_TEMPORARY, "GFP_TEMPORARY"}, \
- {(unsigned long)GFP_KERNEL, "GFP_KERNEL"}, \
- {(unsigned long)GFP_NOFS, "GFP_NOFS"}, \
- {(unsigned long)GFP_ATOMIC, "GFP_ATOMIC"}, \
- {(unsigned long)GFP_NOIO, "GFP_NOIO"}, \
- {(unsigned long)__GFP_HIGH, "GFP_HIGH"}, \
- {(unsigned long)__GFP_WAIT, "GFP_WAIT"}, \
- {(unsigned long)__GFP_IO, "GFP_IO"}, \
- {(unsigned long)__GFP_COLD, "GFP_COLD"}, \
- {(unsigned long)__GFP_NOWARN, "GFP_NOWARN"}, \
- {(unsigned long)__GFP_REPEAT, "GFP_REPEAT"}, \
- {(unsigned long)__GFP_NOFAIL, "GFP_NOFAIL"}, \
- {(unsigned long)__GFP_NORETRY, "GFP_NORETRY"}, \
- {(unsigned long)__GFP_COMP, "GFP_COMP"}, \
- {(unsigned long)__GFP_ZERO, "GFP_ZERO"}, \
- {(unsigned long)__GFP_NOMEMALLOC, "GFP_NOMEMALLOC"}, \
- {(unsigned long)__GFP_HARDWALL, "GFP_HARDWALL"}, \
- {(unsigned long)__GFP_THISNODE, "GFP_THISNODE"}, \
- {(unsigned long)__GFP_RECLAIMABLE, "GFP_RECLAIMABLE"}, \
- {(unsigned long)__GFP_MOVABLE, "GFP_MOVABLE"} \
- ) : "GFP_NOWAIT"
+#include "gfpflags.h"
DECLARE_EVENT_CLASS(kmem_alloc,
diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
new file mode 100644
index 0000000..f76521f
--- /dev/null
+++ b/include/trace/events/vmscan.h
@@ -0,0 +1,115 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM vmscan
+
+#if !defined(_TRACE_VMSCAN_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_VMSCAN_H
+
+#include <linux/types.h>
+#include <linux/tracepoint.h>
+#include "gfpflags.h"
+
+TRACE_EVENT(mm_vmscan_kswapd_sleep,
+
+ TP_PROTO(int nid),
+
+ TP_ARGS(nid),
+
+ TP_STRUCT__entry(
+ __field( int, nid )
+ ),
+
+ TP_fast_assign(
+ __entry->nid = nid;
+ ),
+
+ TP_printk("nid=%d", __entry->nid)
+);
+
+TRACE_EVENT(mm_vmscan_kswapd_wake,
+
+ TP_PROTO(int nid, int order),
+
+ TP_ARGS(nid, order),
+
+ TP_STRUCT__entry(
+ __field( int, nid )
+ __field( int, order )
+ ),
+
+ TP_fast_assign(
+ __entry->nid = nid;
+ __entry->order = order;
+ ),
+
+ TP_printk("nid=%d order=%d", __entry->nid, __entry->order)
+);
+
+TRACE_EVENT(mm_vmscan_wakeup_kswapd,
+
+ TP_PROTO(int nid, int zid, int order),
+
+ TP_ARGS(nid, zid, order),
+
+ TP_STRUCT__entry(
+ __field( int, nid )
+ __field( int, zid )
+ __field( int, order )
+ ),
+
+ TP_fast_assign(
+ __entry->nid = nid;
+ __entry->zid = zid;
+ __entry->order = order;
+ ),
+
+ TP_printk("nid=%d zid=%d order=%d",
+ __entry->nid,
+ __entry->zid,
+ __entry->order)
+);
+
+TRACE_EVENT(mm_vmscan_direct_reclaim_begin,
+
+ TP_PROTO(int order, int may_writepage, gfp_t gfp_flags),
+
+ TP_ARGS(order, may_writepage, gfp_flags),
+
+ TP_STRUCT__entry(
+ __field( int, order )
+ __field( int, may_writepage )
+ __field( gfp_t, gfp_flags )
+ ),
+
+ TP_fast_assign(
+ __entry->order = order;
+ __entry->may_writepage = may_writepage;
+ __entry->gfp_flags = gfp_flags;
+ ),
+
+ TP_printk("order=%d may_writepage=%d gfp_flags=%s",
+ __entry->order,
+ __entry->may_writepage,
+ show_gfp_flags(__entry->gfp_flags))
+);
+
+TRACE_EVENT(mm_vmscan_direct_reclaim_end,
+
+ TP_PROTO(unsigned long nr_reclaimed),
+
+ TP_ARGS(nr_reclaimed),
+
+ TP_STRUCT__entry(
+ __field( unsigned long, nr_reclaimed )
+ ),
+
+ TP_fast_assign(
+ __entry->nr_reclaimed = nr_reclaimed;
+ ),
+
+ TP_printk("nr_reclaimed=%lu", __entry->nr_reclaimed)
+);
+
+#endif /* _TRACE_VMSCAN_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 6dafa45..c99bc41 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -48,6 +48,9 @@
#include "internal.h"
+#define CREATE_TRACE_POINTS
+#include <trace/events/vmscan.h>
+
struct scan_control {
/* Incremented by the number of inactive pages that were scanned */
unsigned long nr_scanned;
@@ -1883,6 +1886,7 @@ out:
unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
gfp_t gfp_mask, nodemask_t *nodemask)
{
+ unsigned long nr_reclaimed;
struct scan_control sc = {
.gfp_mask = gfp_mask,
.may_writepage = !laptop_mode,
@@ -1895,7 +1899,15 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
.nodemask = nodemask,
};
- return do_try_to_free_pages(zonelist, &sc);
+ trace_mm_vmscan_direct_reclaim_begin(order,
+ sc.may_writepage,
+ gfp_mask);
+
+ nr_reclaimed = do_try_to_free_pages(zonelist, &sc);
+
+ trace_mm_vmscan_direct_reclaim_end(nr_reclaimed);
+
+ return nr_reclaimed;
}
#ifdef CONFIG_CGROUP_MEM_RES_CTLR
@@ -2294,9 +2306,10 @@ static int kswapd(void *p)
* premature sleep. If not, then go fully
* to sleep until explicitly woken up
*/
- if (!sleeping_prematurely(pgdat, order, remaining))
+ if (!sleeping_prematurely(pgdat, order, remaining)) {
+ trace_mm_vmscan_kswapd_sleep(pgdat->node_id);
schedule();
- else {
+ } else {
if (remaining)
count_vm_event(KSWAPD_LOW_WMARK_HIT_QUICKLY);
else
@@ -2316,8 +2329,10 @@ static int kswapd(void *p)
* We can speed up thawing tasks if we don't call balance_pgdat
* after returning from the refrigerator
*/
- if (!ret)
+ if (!ret) {
+ trace_mm_vmscan_kswapd_wake(pgdat->node_id, order);
balance_pgdat(pgdat, order);
+ }
}
return 0;
}
@@ -2337,6 +2352,7 @@ void wakeup_kswapd(struct zone *zone, int order)
return;
if (pgdat->kswapd_max_order < order)
pgdat->kswapd_max_order = order;
+ trace_mm_vmscan_wakeup_kswapd(pgdat->node_id, zone_idx(zone), order);
if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL))
return;
if (!waitqueue_active(&pgdat->kswapd_wait))
OpenPOWER on IntegriCloud