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authorMichael Ellerman <mpe@ellerman.id.au>2014-07-23 17:31:35 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2014-07-28 14:11:30 +1000
commit86450f20fb0047266c374d1bcc66ba747bd6b44f (patch)
tree5c555ac7ac5e86b7c366d41b3e417eeb27a62850
parent1feaa87c2fd7d610d154a3b7b739870030d2a7aa (diff)
downloadop-kernel-dev-86450f20fb0047266c374d1bcc66ba747bd6b44f.zip
op-kernel-dev-86450f20fb0047266c374d1bcc66ba747bd6b44f.tar.gz
selftests/powerpc: Count instructions under scheduler pressure
Have a task eat some cpu while we are counting instructions to create some scheduler pressure. The idea being to try and unearth any bugs we have in counting that only appear when context switching is happening. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--tools/testing/selftests/powerpc/pmu/Makefile2
-rw-r--r--tools/testing/selftests/powerpc/pmu/count_instructions.c8
2 files changed, 8 insertions, 2 deletions
diff --git a/tools/testing/selftests/powerpc/pmu/Makefile b/tools/testing/selftests/powerpc/pmu/Makefile
index ebc0e74..8595cfd 100644
--- a/tools/testing/selftests/powerpc/pmu/Makefile
+++ b/tools/testing/selftests/powerpc/pmu/Makefile
@@ -2,7 +2,7 @@ noarg:
$(MAKE) -C ../
PROGS := count_instructions l3_bank_test
-EXTRA_SOURCES := ../harness.c event.c
+EXTRA_SOURCES := ../harness.c event.c lib.c
SUB_TARGETS = ebb
diff --git a/tools/testing/selftests/powerpc/pmu/count_instructions.c b/tools/testing/selftests/powerpc/pmu/count_instructions.c
index 312b4f0..5e241e1 100644
--- a/tools/testing/selftests/powerpc/pmu/count_instructions.c
+++ b/tools/testing/selftests/powerpc/pmu/count_instructions.c
@@ -12,6 +12,7 @@
#include "event.h"
#include "utils.h"
+#include "lib.h"
extern void thirty_two_instruction_loop(u64 loops);
@@ -90,7 +91,7 @@ static u64 determine_overhead(struct event *events)
return overhead;
}
-static int count_instructions(void)
+static int test_body(void)
{
struct event events[2];
u64 overhead;
@@ -129,6 +130,11 @@ static int count_instructions(void)
return 0;
}
+static int count_instructions(void)
+{
+ return eat_cpu(test_body);
+}
+
int main(void)
{
return test_harness(count_instructions, "count_instructions");
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