commit b5a6b71b1901b9ca495f669c9ad86f2181960aba
author Martin Schwidefsky <schwidefsky@de.ibm.com> Fri Aug 21 16:05:32 2015 +0200
committer Martin Schwidefsky <schwidefsky@de.ibm.com> Wed Oct 14 14:32:06 2015 +0200
tree 26279ca6f071672d96ac6713c7ce4997d84482de
parent 1ec2772e0c3ca3159035c03165355e355efc326b

s390/diag: add tracepoint for diagnose calls

To be able to analyse problems in regard to hypervisor overhead
add a tracepoing for diagnose calls. It reports the number of
the diagnose issued, e.g.

            sshd-1385  [002] ....    42.701431: diagnose: nr=0x9c
          <idle>-0     [001] ..s.    43.587528: diagnose: nr=0x9c

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/kernel/diag.c

diff --git a/arch/s390/kernel/diag.c b/arch/s390/kernel/diag.c
index 4ddb520..f98766e 100644
--- a/arch/s390/kernel/diag.c
+++ b/arch/s390/kernel/diag.c
@@ -10,9 +10,13 @@
 #include <linux/seq_file.h>
 #include <linux/debugfs.h>
 #include <asm/diag.h>
+#include <asm/trace/diag.h>
 
-DEFINE_PER_CPU(struct diag_stat, diag_stat);
-EXPORT_PER_CPU_SYMBOL(diag_stat);
+struct diag_stat {
+	unsigned int counter[NR_DIAG_STAT];
+};
+
+static DEFINE_PER_CPU(struct diag_stat, diag_stat);
 
 struct diag_desc {
 	int code;
@@ -114,6 +118,20 @@
 
 device_initcall(show_diag_stat_init);
 
+void diag_stat_inc(enum diag_stat_enum nr)
+{
+	this_cpu_inc(diag_stat.counter[nr]);
+	trace_diagnose(diag_map[nr].code);
+}
+EXPORT_SYMBOL(diag_stat_inc);
+
+void diag_stat_inc_norecursion(enum diag_stat_enum nr)
+{
+	this_cpu_inc(diag_stat.counter[nr]);
+	trace_diagnose_norecursion(diag_map[nr].code);
+}
+EXPORT_SYMBOL(diag_stat_inc_norecursion);
+
 /*
  * Diagnose 14: Input spool file manipulation
  */