mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-20 14:13:16 +00:00
b5d6256ca8
vdso support is available on mips starting with kernel 4.4, see kernel commit a7f4df4e21 "MIPS: VDSO: Add implementations of gettimeofday() and clock_gettime()" for details. These are my micro benchmark results for 1.000.000 calls to clock_gettime(CLOCK_MONOTONIC, &tp) without vdso: root@OpenWrt:/# time ./vdso-test real 0m 0.95s user 0m 0.24s sys 0m 0.70s with vdso: root@OpenWrt:/# time /usr/bin/vdso-test real 0m 0.35s user 0m 0.34s sys 0m 0.00s Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> SVN-Revision: 48466
30 lines
921 B
Diff
30 lines
921 B
Diff
From c29a29c3334344e0f3cfdec6130a6261514507a0 Mon Sep 17 00:00:00 2001
|
|
From: Hauke Mehrtens <hauke@hauke-m.de>
|
|
Date: Sat, 23 Jan 2016 16:23:09 +0100
|
|
Subject: [PATCH 2/2] mips: add vdso support
|
|
|
|
vdso support is available on mips starting with kernel 4.4, see kernel
|
|
commit a7f4df4e21 "MIPS: VDSO: Add implementations of gettimeofday()
|
|
and clock_gettime()" for details.
|
|
|
|
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
|
|
---
|
|
arch/mips/syscall_arch.h | 4 ++++
|
|
1 file changed, 4 insertions(+)
|
|
|
|
diff --git a/arch/mips/syscall_arch.h b/arch/mips/syscall_arch.h
|
|
index e74e0ad..39c0ea3 100644
|
|
--- a/arch/mips/syscall_arch.h
|
|
+++ b/arch/mips/syscall_arch.h
|
|
@@ -161,3 +161,7 @@ static inline long __syscall6(long n, long a, long b, long c, long d, long e, lo
|
|
if (n == SYS_fstatat) __stat_fix(c);
|
|
return r2;
|
|
}
|
|
+
|
|
+#define VDSO_USEFUL
|
|
+#define VDSO_CGT_SYM "__vdso_clock_gettime"
|
|
+#define VDSO_CGT_VER "LINUX_2.6"
|
|
--
|
|
2.7.0.rc3
|
|
|