sched, latencytop: incorporate review feedback from Andrew Morton
Andrew had some suggestions for the latencytop file; this patch takes care
of most of these:
* Add documentation
* Turn account_scheduler_latency into an inline function
* Don't report negative values to userspace
* Make the file operations struct const
* Fix a few checkpatch.pl warnings
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/linux/latencytop.h b/include/linux/latencytop.h
index 901c2d6..b0e9989 100644
--- a/include/linux/latencytop.h
+++ b/include/linux/latencytop.h
@@ -9,6 +9,7 @@
#ifndef _INCLUDE_GUARD_LATENCYTOP_H_
#define _INCLUDE_GUARD_LATENCYTOP_H_
+#include <linux/compiler.h>
#ifdef CONFIG_LATENCYTOP
#define LT_SAVECOUNT 32
@@ -24,7 +25,14 @@
struct task_struct;
-void account_scheduler_latency(struct task_struct *task, int usecs, int inter);
+extern int latencytop_enabled;
+void __account_scheduler_latency(struct task_struct *task, int usecs, int inter);
+static inline void
+account_scheduler_latency(struct task_struct *task, int usecs, int inter)
+{
+ if (unlikely(latencytop_enabled))
+ __account_scheduler_latency(task, usecs, inter);
+}
void clear_all_latency_tracing(struct task_struct *p);