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runtime: implement time.now in assembly for linux-amd64
name old time/op new time/op delta AfterFunc-12 66.7µs ± 3% 66.8µs ± 4% ~ (p=0.836 n=20+20) After-12 99.4µs ± 4% 98.1µs ± 3% -1.31% (p=0.013 n=20+20) Stop-12 66.1µs ±12% 65.4µs ±10% ~ (p=0.602 n=20+20) SimultaneousAfterFunc-12 110µs ± 1% 114µs ± 2% +3.98% (p=0.000 n=19+18) StartStop-12 32.1µs ±15% 32.2µs ±13% ~ (p=0.620 n=20+20) Reset-12 3.66µs ± 2% 3.63µs ± 5% -0.92% (p=0.018 n=20+17) Sleep-12 134µs ± 1% 139µs ± 4% +3.97% (p=0.000 n=20+18) Ticker-12 32.8µs ± 1% 32.6µs ± 2% -0.63% (p=0.017 n=18+20) TickerReset-12 3.72µs ± 3% 3.71µs ± 3% ~ (p=0.753 n=20+20) TickerResetNaive-12 68.9µs ±11% 65.8µs ± 8% -4.44% (p=0.008 n=20+20) Now-12 33.3ns ± 1% 29.6ns ± 0% -11.06% (p=0.000 n=18+16) NowUnixNano-12 34.6ns ± 0% 31.2ns ± 0% -9.94% (p=0.000 n=20+17) NowUnixMilli-12 35.0ns ± 1% 30.9ns ± 0% -11.75% (p=0.000 n=19+15) NowUnixMicro-12 35.0ns ± 0% 30.9ns ± 0% -11.85% (p=0.000 n=20+19) Format-12 302ns ± 3% 306ns ± 3% +1.22% (p=0.009 n=20+20) FormatNow-12 184ns ± 5% 187ns ± 2% +1.25% (p=0.046 n=20+19) MarshalJSON-12 262ns ± 2% 270ns ± 3% +2.99% (p=0.000 n=20+20) MarshalText-12 262ns ± 3% 268ns ± 3% +2.37% (p=0.000 n=19+19) Parse-12 145ns ± 1% 148ns ± 0% +2.27% (p=0.000 n=18+19) ParseDuration-12 82.3ns ± 1% 79.7ns ± 1% -3.06% (p=0.000 n=20+20) Hour-12 4.48ns ± 1% 4.42ns ± 1% -1.32% (p=0.000 n=19+19) Second-12 4.44ns ± 1% 4.42ns ± 1% -0.39% (p=0.000 n=20+18) Year-12 11.2ns ± 1% 11.1ns ± 1% ~ (p=0.193 n=20+20) Day-12 14.8ns ± 0% 14.8ns ± 1% ~ (p=0.873 n=19+20) ISOWeek-12 17.2ns ± 0% 17.2ns ± 0% ~ (p=0.605 n=18+20) name old avg-late-ns new avg-late-ns delta ParallelTimerLatency-12 375k ± 3% 377k ± 3% ~ (p=0.445 n=20+20) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=1-12 136k ± 2% 137k ± 2% ~ (p=0.242 n=20+20) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=2-12 97.4k ±11% 96.4k ±10% ~ (p=0.336 n=19+20) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=3-12 74.8k ± 3% 74.2k ± 3% ~ (p=0.158 n=20+19) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=4-12 70.7k ± 7% 70.4k ± 6% ~ (p=0.879 n=20+19) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=5-12 65.8k ± 9% 66.3k ±14% ~ (p=0.594 n=17+19) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=6-12 55.5k ±29% 56.7k ±30% ~ (p=0.758 n=20+20) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=7-12 45.3k ±29% 43.6k ±33% ~ (p=0.212 n=19+19) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=8-12 64.7k ±46% 65.2k ±78% ~ (p=0.480 n=18+19) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=9-12 147k ±88% 119k ±83% ~ (p=0.092 n=19+18) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=10-12 2.63M ±29% 2.70M ±59% ~ (p=0.989 n=19+20) StaggeredTickerLatency/work-dur=2ms/tickers-per-P=1-12 81.4k ± 4% 80.2k ± 3% -1.55% (p=0.009 n=17+18) name old max-late-ns new max-late-ns delta ParallelTimerLatency-12 7.66M ±102% 6.98M ±131% ~ (p=0.445 n=20+20) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=1-12 381k ±12% 382k ±17% ~ (p=0.901 n=17+16) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=2-12 388k ±69% 356k ±10% ~ (p=0.363 n=17+16) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=3-12 350k ±17% 347k ±25% ~ (p=0.538 n=19+18) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=4-12 378k ±52% 341k ±30% ~ (p=0.153 n=18+17) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=5-12 392k ±54% 410k ±78% ~ (p=0.730 n=18+19) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=6-12 467k ±80% 527k ±129% ~ (p=0.616 n=17+19) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=7-12 915k ±138% 1023k ±227% ~ (p=0.696 n=20+18) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=8-12 1.84M ±155% 1.74M ±158% ~ (p=0.893 n=18+19) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=9-12 6.95M ±92% 7.66M ±91% ~ (p=0.687 n=19+20) StaggeredTickerLatency/work-dur=300µs/tickers-per-P=10-12 18.6M ±22% 16.2M ±28% -12.78% (p=0.003 n=19+19) StaggeredTickerLatency/work-dur=2ms/tickers-per-P=1-12 1.01M ± 8% 1.04M ±10% ~ (p=0.111 n=19+18) Change-Id: I96aa2e0206a6e9286bcbfc8be372e84608ed4e2f Reviewed-on: https://go-review.googlesource.com/c/go/+/314277 Trust: Ian Lance Taylor <iant@golang.org> Reviewed-by: Michael Knyszek <mknyszek@google.com>
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Ian Lance Taylor
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3 changed files with 104 additions and 4 deletions
97
src/runtime/time_linux_amd64.s
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src/runtime/time_linux_amd64.s
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// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build !faketime
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// +build !faketime
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#include "go_asm.h"
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#include "go_tls.h"
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#include "textflag.h"
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#define SYS_clock_gettime 228
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// func time.now() (sec int64, nsec int32, mono int64)
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TEXT time·now(SB),NOSPLIT,$16-24
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MOVQ SP, R12 // Save old SP; R12 unchanged by C code.
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#ifdef GOEXPERIMENT_regabig
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MOVQ g_m(R14), BX // BX unchanged by C code.
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#else
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get_tls(CX)
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MOVQ g(CX), AX
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MOVQ g_m(AX), BX // BX unchanged by C code.
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#endif
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// Store CLOCK_REALTIME results directly to return space.
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LEAQ sec+0(FP), SI
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// Set vdsoPC and vdsoSP for SIGPROF traceback.
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// Save the old values on stack and restore them on exit,
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// so this function is reentrant.
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MOVQ m_vdsoPC(BX), CX
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MOVQ m_vdsoSP(BX), DX
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MOVQ CX, 0(SP)
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MOVQ DX, 8(SP)
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MOVQ -8(SI), CX // Sets CX to function return address.
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MOVQ CX, m_vdsoPC(BX)
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MOVQ SI, m_vdsoSP(BX)
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#ifdef GOEXPERIMENT_regabig
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CMPQ R14, m_curg(BX) // Only switch if on curg.
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#else
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CMPQ AX, m_curg(BX) // Only switch if on curg.
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#endif
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JNE noswitch
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MOVQ m_g0(BX), DX
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MOVQ (g_sched+gobuf_sp)(DX), SP // Set SP to g0 stack
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noswitch:
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SUBQ $16, SP // Space for monotonic time results
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ANDQ $~15, SP // Align for C code
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MOVL $0, DI // CLOCK_REALTIME
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MOVQ runtime·vdsoClockgettimeSym(SB), AX
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CMPQ AX, $0
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JEQ fallback
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CALL AX
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MOVL $1, DI // CLOCK_MONOTONIC
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LEAQ 0(SP), SI
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MOVQ runtime·vdsoClockgettimeSym(SB), AX
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CALL AX
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ret:
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MOVQ 0(SP), AX // sec
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MOVQ 8(SP), DX // nsec
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MOVQ R12, SP // Restore real SP
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// Restore vdsoPC, vdsoSP
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// We don't worry about being signaled between the two stores.
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// If we are not in a signal handler, we'll restore vdsoSP to 0,
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// and no one will care about vdsoPC. If we are in a signal handler,
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// we cannot receive another signal.
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MOVQ 8(SP), CX
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MOVQ CX, m_vdsoSP(BX)
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MOVQ 0(SP), CX
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MOVQ CX, m_vdsoPC(BX)
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// sec is in AX, nsec in DX
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// return nsec in AX
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IMULQ $1000000000, AX
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ADDQ DX, AX
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MOVQ AX, mono+16(FP)
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RET
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fallback:
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MOVQ $SYS_clock_gettime, AX
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SYSCALL
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MOVL $1, DI // CLOCK_MONOTONIC
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LEAQ 0(SP), SI
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MOVQ $SYS_clock_gettime, AX
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SYSCALL
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JMP ret
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@ -4,8 +4,9 @@
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// Declarations for operating systems implementing time.now directly in assembly.
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//go:build !faketime && windows
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// +build !faketime,windows
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//go:build !faketime && (windows || (linux && amd64))
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// +build !faketime
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// +build windows linux,amd64
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package runtime
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// Declarations for operating systems implementing time.now
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// indirectly, in terms of walltime and nanotime assembly.
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//go:build !faketime && !windows
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// +build !faketime,!windows
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//go:build !faketime && !windows && !(linux && amd64)
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// +build !faketime
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// +build !windows
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// +build !linux !amd64
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package runtime
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