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| author | Hauke Mehrtens <hauke@hauke-m.de> | 2016-01-23 23:48:55 +0000 |
|---|---|---|
| committer | Hauke Mehrtens <hauke@hauke-m.de> | 2016-01-23 23:48:55 +0000 |
| commit | b5d6256ca885be87cf8e2a69fefc7ac3248c7f72 (patch) | |
| tree | 7fa0cab535a595273cb5b47ff2efd9b8a1d9c468 /toolchain | |
| parent | 9d0703f0161b5231f07f20e9ac6dadfe3c4925d3 (diff) | |
| download | mtk-20170518-b5d6256ca885be87cf8e2a69fefc7ac3248c7f72.zip mtk-20170518-b5d6256ca885be87cf8e2a69fefc7ac3248c7f72.tar.gz mtk-20170518-b5d6256ca885be87cf8e2a69fefc7ac3248c7f72.tar.bz2 | |
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 <hauke@hauke-m.de>
SVN-Revision: 48466
Diffstat (limited to 'toolchain')
| -rw-r--r-- | toolchain/musl/patches/030-mips-add-vdso-support.patch | 29 |
1 files changed, 29 insertions, 0 deletions
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 0000000..e4a15e3 --- /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 <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 + |