[profile] Add generic profiling infrastructure

Signed-off-by: Michael Brown <mcb30@ipxe.org>

1 files changed, 140 insertions, 0 deletions

diff --git a/src/tests/profile_test.c b/src/tests/profile_test.c
new file mode 100644
index 00000000..9d682bf2
--- /dev/null
+++ b/src/tests/profile_test.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2014 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/** @file
+ *
+ * Profiling self-tests
+ *
+ */
+
+/* Forcibly enable assertions */
+#undef NDEBUG
+
+#include <string.h>
+#include <assert.h>
+#include <ipxe/test.h>
+#include <ipxe/profile.h>
+
+/** A profiling test */
+struct profile_test {
+	/** Sample values */
+	const unsigned long *samples;
+	/** Number of samples */
+	unsigned int count;
+	/** Expected mean sample value */
+	unsigned long mean;
+	/** Expected standard deviation */
+	unsigned long stddev;
+};
+
+/** Define inline data */
+#define DATA(...) { __VA_ARGS__ }
+
+/** Define a profiling test */
+#define PROFILE_TEST( name, MEAN, STDDEV, SAMPLES )			\
+	static const unsigned long name ## _samples[] = SAMPLES;	\
+	static struct profile_test name = {				\
+		.samples = name ## _samples,				\
+		.count = ( sizeof ( name ## _samples ) /		\
+			   sizeof ( name ## _samples [0] ) ),		\
+		.mean = MEAN,						\
+		.stddev = STDDEV,					\
+	}
+
+/** Empty data set */
+PROFILE_TEST ( empty, 0, 0, DATA() );
+
+/** Single-element data set (zero) */
+PROFILE_TEST ( zero, 0, 0, DATA ( 0 ) );
+
+/** Single-element data set (non-zero) */
+PROFILE_TEST ( single, 42, 0, DATA ( 42 ) );
+
+/** Multiple identical element data set */
+PROFILE_TEST ( identical, 69, 0, DATA ( 69, 69, 69, 69, 69, 69, 69 ) );
+
+/** Small element data set */
+PROFILE_TEST ( small, 5, 2, DATA ( 3, 5, 9, 4, 3, 2, 5, 7 ) );
+
+/** Random data set */
+PROFILE_TEST ( random, 70198, 394,
+	       DATA ( 69772, 70068, 70769, 69653, 70663, 71078, 70101, 70341,
+		      70215, 69600, 70020, 70456, 70421, 69972, 70267, 69999,
+		      69972 ) );
+
+/** Large-valued random data set */
+PROFILE_TEST ( large, 93533894UL, 25538UL,
+	       DATA ( 93510333UL, 93561169UL, 93492361UL, 93528647UL,
+		      93557566UL, 93503465UL, 93540126UL, 93549020UL,
+		      93502307UL, 93527320UL, 93537152UL, 93540125UL,
+		      93550773UL, 93586731UL, 93521312UL ) );
+
+/**
+ * Report a profiling test result
+ *
+ * @v test		Profiling test
+ * @v file		Test code file
+ * @v line		Test code line
+ */
+static void profile_okx ( struct profile_test *test, const char *file,
+			  unsigned int line ) {
+	struct profiler profiler;
+	unsigned long mean;
+	unsigned long stddev;
+	unsigned int i;
+
+	/* Initialise profiler */
+	memset ( &profiler, 0, sizeof ( profiler ) );
+
+	/* Record sample values */
+	for ( i = 0 ; i < test->count ; i++ )
+		profile_update ( &profiler, test->samples[i] );
+
+	/* Check resulting statistics */
+	mean = profile_mean ( &profiler );
+	stddev = profile_stddev ( &profiler );
+	DBGC ( test, "PROFILE calculated mean %ld stddev %ld\n", mean, stddev );
+	okx ( mean == test->mean, file, line );
+	okx ( stddev == test->stddev, file, line );
+}
+#define profile_ok( test ) profile_okx ( test, __FILE__, __LINE__ )
+
+/**
+ * Perform profiling self-tests
+ *
+ */
+static void profile_test_exec ( void ) {
+
+	/* Perform profiling tests */
+	profile_ok ( &empty );
+	profile_ok ( &zero );
+	profile_ok ( &single );
+	profile_ok ( &identical );
+	profile_ok ( &small );
+	profile_ok ( &random );
+	profile_ok ( &large );
+}
+
+/** Profiling self-test */
+struct self_test profile_test __self_test = {
+	.name = "profile",
+	.exec = profile_test_exec,
+};