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Commit 86450f20 authored by Michael Ellerman's avatar Michael Ellerman Committed by Benjamin Herrenschmidt
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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: default avatarMichael Ellerman <mpe@ellerman.id.au>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 1feaa87c

tools/testing/selftests/powerpc/pmu/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -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

tools/testing/selftests/powerpc/pmu/count_instructions.c

+7 −1
Original line number Diff line number Diff line
@@ -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");