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From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Shuah Khan <shuah@kernel.org>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	linux-kselftest@vger.kernel.org
Subject: [PATCH] powerpc/selftests: Use gettid() instead of getppid() for null_syscall
Date: Fri,  4 Jun 2021 12:31:09 +0000 (UTC)	[thread overview]
Message-ID: <0ad62673d3e063f848e7c99d719bb966efd433e8.1622809833.git.christophe.leroy@csgroup.eu> (raw)

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

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.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


WARNING: multiple messages have this Message-ID (diff)
From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Shuah Khan <shuah@kernel.org>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	linux-kselftest@vger.kernel.org
Subject: [PATCH] powerpc/selftests: Use gettid() instead of getppid() for null_syscall
Date: Fri,  4 Jun 2021 12:31:09 +0000 (UTC)	[thread overview]
Message-ID: <0ad62673d3e063f848e7c99d719bb966efd433e8.1622809833.git.christophe.leroy@csgroup.eu> (raw)

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

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.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


             reply	other threads:[~2021-06-04 12:31 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-04 12:31 Christophe Leroy [this message]
2021-06-04 12:31 ` [PATCH] powerpc/selftests: Use gettid() instead of getppid() for null_syscall Christophe Leroy
2021-06-18  3:51 ` Michael Ellerman
2021-06-18  3:51   ` Michael Ellerman

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