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authorDavid Goulet <dgoulet@torproject.org>2022-11-03 10:43:37 -0400
committerDavid Goulet <dgoulet@torproject.org>2022-11-07 09:55:06 -0500
commitc565ef9c58546a815431d575c9ad16fb0bf2dc22 (patch)
treeaef852436c5910f30f6a72774c67609fc91bbb44 /src/lib
parent87e820a0c54e57fc282bb5d2472ef775504be8e0 (diff)
downloadtor-c565ef9c58546a815431d575c9ad16fb0bf2dc22.tar.gz
tor-c565ef9c58546a815431d575c9ad16fb0bf2dc22.zip
metrics: Add running average of CC cwnd when exiting slow start
Part of #40708 Signed-off-by: David Goulet <dgoulet@torproject.org>
Diffstat (limited to 'src/lib')
-rw-r--r--src/lib/math/include.am3
-rw-r--r--src/lib/math/stats.h19
2 files changed, 21 insertions, 1 deletions
diff --git a/src/lib/math/include.am b/src/lib/math/include.am
index b2ca280f47..f68b265da7 100644
--- a/src/lib/math/include.am
+++ b/src/lib/math/include.am
@@ -20,4 +20,5 @@ src_lib_libtor_math_testing_a_CFLAGS = $(AM_CFLAGS) $(TEST_CFLAGS)
noinst_HEADERS += \
src/lib/math/fp.h \
src/lib/math/laplace.h \
- src/lib/math/prob_distr.h
+ src/lib/math/prob_distr.h \
+ src/lib/math/stats.h
diff --git a/src/lib/math/stats.h b/src/lib/math/stats.h
new file mode 100644
index 0000000000..fae93c6213
--- /dev/null
+++ b/src/lib/math/stats.h
@@ -0,0 +1,19 @@
+/* Copyright (c) 2022, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/**
+ * \file stats.h
+ *
+ * \brief Header for stats.c
+ **/
+
+#ifndef TOR_STATS_H
+#define TOR_STATS_H
+
+/** Update an average making it a "running average". The "avg" is the current
+ * value that will be updated to the new one. The "value" is the new value to
+ * add to the average and "n" is the new count as in including the "value". */
+#define STATS_UPDATE_AVG(avg, value, n) \
+ avg = ((avg) * ((n) - 1) + (value)) / (n)
+
+#endif /* !defined(TOR_STATS_H) */