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powerpc/selftests: Use gettid() instead of getppid() for null_syscall

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gettid() is 10% lighter than getppid(), use it for null_syscall selftest.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/0ad62673d3e063f848e7c99d719bb966efd433e8.1622809833.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy
2021-06-04 12:31:09 +00:00
committed by Michael Ellerman
parent e2c043163d
commit a1ea0ca8a6
1 changed files with 2 additions and 1 deletions
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3
tools/testing/selftests/powerpc/benchmarks/null_syscall.c
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@@ -14,6 +14,7 @@
#include <time.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/syscall.h>
#include <signal.h>
static volatile int soak_done;
@@ -121,7 +122,7 @@ static void do_null_syscall(unsigned long nr)
unsigned long i;
for (i = 0; i < nr; i++)
getppid();
syscall(__NR_gettid);
}
#define TIME(A, STR) \