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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
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From: Hauke Mehrtens <hauke@hauke-m.de>
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Date: Sat, 23 Jan 2016 16:23:09 +0100
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Subject: [PATCH 2/2] mips: add vdso support
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vdso support is available on mips starting with kernel 4.4, see kernel
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commit a7f4df4e21 "MIPS: VDSO: Add implementations of gettimeofday()
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and clock_gettime()" for details.
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Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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---
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arch/mips/syscall_arch.h | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/arch/mips/syscall_arch.h b/arch/mips/syscall_arch.h
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index e74e0ad..39c0ea3 100644
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--- a/arch/mips/syscall_arch.h
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+++ b/arch/mips/syscall_arch.h
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@@ -161,3 +161,7 @@ static inline long __syscall6(long n, long a, long b, long c, long d, long e, lo
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if (n == SYS_fstatat) __stat_fix(c);
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return r2;
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}
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+
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+#define VDSO_USEFUL
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+#define VDSO_CGT_SYM "__vdso_clock_gettime"
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+#define VDSO_CGT_VER "LINUX_2.6"
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--
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2.7.0.rc3
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