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runtime: check mips64 VDSO clock_gettime return code

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We introduced VDSO feature for mips64x in Go1.14, however Linux kernel
didn't ship VDSO safe fallback until 4.13.

This CL checks vdso return code it may fix this issue.

name         old time/op  new time/op  delta
Now           174ns ± 0%   176ns ± 0%  +1.20%  (p=0.000 n=8+9)
NowUnixNano   175ns ± 0%   177ns ± 0%  +1.13%  (p=0.000 n=9+7)
FormatNow    1.01µs ± 1%  1.02µs ± 3%    ~     (p=0.181 n=10+10)

Fixes #39046

Change-Id: Ibcefe4c8334f634c7ef18fa70f3c7dbe8306f224
Reviewed-on: https://go-review.googlesource.com/c/go/+/270717
Run-TryBot: Meng Zhuo <mzh@golangcn.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Michael Pratt <mpratt@google.com>
Trust: Meng Zhuo <mzh@golangcn.org>
This commit is contained in:
Meng Zhuo 2020-11-18 10:28:18 +08:00
parent 4787e906cf
commit df81a15819
1 changed files with 14 additions and 0 deletions
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14
src/runtime/sys_linux_mips64x.s
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@ -250,6 +250,14 @@ noswitch:
BEQ R25, fallback
JAL (R25)
// check on vdso call return for kernel compatibility
// see https://golang.org/issues/39046
// if we get any error make fallback permanent.
BEQ R2, R0, finish
MOVV R0, runtime·vdsoClockgettimeSym(SB)
MOVW $0, R4 // CLOCK_REALTIME
MOVV $0(R29), R5
JMP fallback
finish:
MOVV 0(R29), R3 // sec
@ -311,6 +319,12 @@ noswitch:
BEQ R25, fallback
JAL (R25)
// see walltime1 for detail
BEQ R2, R0, finish
MOVV R0, runtime·vdsoClockgettimeSym(SB)
MOVW $1, R4 // CLOCK_MONOTONIC
MOVV $0(R29), R5
JMP fallback
finish:
MOVV 0(R29), R3 // sec