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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>
hifive-unleashed-5.1
Michael Ellerman 2014-07-23 17:31:35 +10:00 committed by Benjamin Herrenschmidt
parent 1feaa87c2f
commit 86450f20fb
2 changed files with 8 additions and 2 deletions
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2
tools/testing/selftests/powerpc/pmu/Makefile
View File

@ -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

8
tools/testing/selftests/powerpc/pmu/count_instructions.c
View File

@ -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");