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authorXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>2012-09-17 12:31:14 +0400
committerArnaldo Carvalho de Melo <acme@redhat.com>2012-09-17 20:10:03 +0400
commit0007eceaceb11520071d053acfe06ee3326b1d13 (patch)
treed9b96c6a53c1ccca87222003e7c5c0e4b0f171a0 /tools/perf/util/stat.h
parent034a9265c289d5298bac7bfd824d3d5b9ec892b4 (diff)
downloadlinux-0007eceaceb11520071d053acfe06ee3326b1d13.tar.xz
perf stat: Move stats related code to util/stat.c
Then, the code can be shared between kvm events and perf stat. Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> [ Dong Hao <haodong@linux.vnet.ibm.com>: rebase it on acme's git tree ] Signed-off-by: Dong Hao <haodong@linux.vnet.ibm.com> Cc: Avi Kivity <avi@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: kvm@vger.kernel.org Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Runzhen Wang <runzhen@linux.vnet.ibm.com> Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1347870675-31495-3-git-send-email-haodong@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/stat.h')
-rw-r--r--tools/perf/util/stat.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
new file mode 100644
index 000000000000..588367c3c767
--- /dev/null
+++ b/tools/perf/util/stat.h
@@ -0,0 +1,16 @@
+#ifndef __PERF_STATS_H
+#define __PERF_STATS_H
+
+#include "types.h"
+
+struct stats
+{
+ double n, mean, M2;
+};
+
+void update_stats(struct stats *stats, u64 val);
+double avg_stats(struct stats *stats);
+double stddev_stats(struct stats *stats);
+double rel_stddev_stats(double stddev, double avg);
+
+#endif