linux-kernel - [PATCH] powerpc/selftests: Use gettid() instead of getppid() for null

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Date:   Fri,  4 Jun 2021 12:31:09 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Shuah Khan <shuah@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kselftest@...r.kernel.org
Subject: [PATCH] powerpc/selftests: Use gettid() instead of getppid() for
 null_syscall

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

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 tools/testing/selftests/powerpc/benchmarks/null_syscall.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/powerpc/benchmarks/null_syscall.c b/tools/testing/selftests/powerpc/benchmarks/null_syscall.c
index 579f0215c6e7..9836838a529f 100644
--- a/tools/testing/selftests/powerpc/benchmarks/null_syscall.c
+++ b/tools/testing/selftests/powerpc/benchmarks/null_syscall.c
@@ -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) \
-- 
2.25.0