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authorArjan van de Ven <arjan@linux.intel.com>2008-01-25 23:08:34 +0300
committerIngo Molnar <mingo@elte.hu>2008-01-25 23:08:34 +0300
commit9745512ce79de686df354dc70a8d1a74d801892d (patch)
tree9b64e2b2e6d2ae534beef136922082f21701c7b9 /include/linux/latencytop.h
parent326587b840785c60f5dc18557235a23bafefd620 (diff)
downloadlinux-9745512ce79de686df354dc70a8d1a74d801892d.tar.xz
sched: latencytop support
LatencyTOP kernel infrastructure; it measures latencies in the scheduler and tracks it system wide and per process. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/latencytop.h')
-rw-r--r--include/linux/latencytop.h44
1 files changed, 44 insertions, 0 deletions
diff --git a/include/linux/latencytop.h b/include/linux/latencytop.h
new file mode 100644
index 000000000000..901c2d6377a8
--- /dev/null
+++ b/include/linux/latencytop.h
@@ -0,0 +1,44 @@
+/*
+ * latencytop.h: Infrastructure for displaying latency
+ *
+ * (C) Copyright 2008 Intel Corporation
+ * Author: Arjan van de Ven <arjan@linux.intel.com>
+ *
+ */
+
+#ifndef _INCLUDE_GUARD_LATENCYTOP_H_
+#define _INCLUDE_GUARD_LATENCYTOP_H_
+
+#ifdef CONFIG_LATENCYTOP
+
+#define LT_SAVECOUNT 32
+#define LT_BACKTRACEDEPTH 12
+
+struct latency_record {
+ unsigned long backtrace[LT_BACKTRACEDEPTH];
+ unsigned int count;
+ unsigned long time;
+ unsigned long max;
+};
+
+
+struct task_struct;
+
+void account_scheduler_latency(struct task_struct *task, int usecs, int inter);
+
+void clear_all_latency_tracing(struct task_struct *p);
+
+#else
+
+static inline void
+account_scheduler_latency(struct task_struct *task, int usecs, int inter)
+{
+}
+
+static inline void clear_all_latency_tracing(struct task_struct *p)
+{
+}
+
+#endif
+
+#endif