From b5d6256ca885be87cf8e2a69fefc7ac3248c7f72 Mon Sep 17 00:00:00 2001 From: Hauke Mehrtens Date: Sat, 23 Jan 2016 23:48:55 +0000 Subject: [PATCH] musl: 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. 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 SVN-Revision: 48466 --- .../patches/030-mips-add-vdso-support.patch | 29 +++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 toolchain/musl/patches/030-mips-add-vdso-support.patch diff --git a/toolchain/musl/patches/030-mips-add-vdso-support.patch b/toolchain/musl/patches/030-mips-add-vdso-support.patch new file mode 100644 index 0000000000..e4a15e323b --- /dev/null +++ b/toolchain/musl/patches/030-mips-add-vdso-support.patch @@ -0,0 +1,29 @@ +From c29a29c3334344e0f3cfdec6130a6261514507a0 Mon Sep 17 00:00:00 2001 +From: Hauke Mehrtens +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 +--- + 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 + -- 2.30.2