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selftests/powerpc: Improve tm-resched-dscr 

The tm-resched-dscr self test can, in some situations, run for
several minutes before being successfully interrupted by the context
switch it needs in order to perform the test. This often seems to
occur when the test is being run in a virtual machine.

Improve the test by running it under eat_cpu() to guarantee
contention for the CPU and increase the chance of a context switch.

In practice this seems to reduce the test time, in some cases, from
more than two minutes to under a second.

Also remove the "progress dots" so that if the test does run for a
long time, it doesn't produce large amounts of unnecessary output.

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Sam Bobroff 2017-08-17 11:06:47 +10:00 committed by Michael Ellerman
parent 711bd207a2
commit 99597ceda0
2 changed files with 9 additions and 4 deletions
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1
tools/testing/selftests/powerpc/tm/Makefile
View File

@ -15,6 +15,7 @@ $(OUTPUT)/tm-syscall: tm-syscall-asm.S
$(OUTPUT)/tm-syscall: CFLAGS += -I../../../../../usr/include
$(OUTPUT)/tm-tmspr: CFLAGS += -pthread
$(OUTPUT)/tm-vmx-unavail: CFLAGS += -pthread -m64
$(OUTPUT)/tm-resched-dscr: ../pmu/lib.o
SIGNAL_CONTEXT_CHK_TESTS := $(patsubst %,$(OUTPUT)/%,$(SIGNAL_CONTEXT_CHK_TESTS))
$(SIGNAL_CONTEXT_CHK_TESTS): tm-signal.S

12
tools/testing/selftests/powerpc/tm/tm-resched-dscr.c
View File

@ -30,6 +30,7 @@
#include "utils.h"
#include "tm.h"
#include "../pmu/lib.h"
#define SPRN_DSCR 0x03
@ -75,8 +76,6 @@ int test_body(void)
);
assert(rv); /* make sure the transaction aborted */
if ((texasr >> 56) != TM_CAUSE_RESCHED) {
putchar('.');
fflush(stdout);
continue;
}
if (dscr2 != dscr1) {
@ -89,7 +88,12 @@ int test_body(void)
}
}
int main(void)
static int tm_resched_dscr(void)
{
return test_harness(test_body, "tm_resched_dscr");
return eat_cpu(test_body);
}
int main(int argc, const char *argv[])
{
return test_harness(tm_resched_dscr, "tm_resched_dscr");
}