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cgo
[ DIR ]
drwxr-xr-x
debug
[ DIR ]
drwxr-xr-x
internal
[ DIR ]
drwxr-xr-x
msan
[ DIR ]
drwxr-xr-x
pprof
[ DIR ]
drwxr-xr-x
race
[ DIR ]
drwxr-xr-x
testdata
[ DIR ]
drwxr-xr-x
trace
[ DIR ]
drwxr-xr-x
HACKING.md
13.07
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Makefile
178
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-rw-r--r--
alg.go
10.18
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asm.s
1.16
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asm_386.s
40.2
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asm_amd64.s
45.78
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asm_arm.s
30.89
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asm_arm64.s
33.12
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asm_mips64x.s
22.45
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asm_mipsx.s
24.72
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asm_ppc64x.h
1023
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asm_ppc64x.s
29.39
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asm_riscv64.s
17.38
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asm_s390x.s
26.35
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asm_wasm.s
9.65
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atomic_arm64.s
259
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atomic_mips64x.s
296
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atomic_mipsx.s
258
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atomic_pointer.go
2.62
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atomic_ppc64x.s
433
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atomic_riscv64.s
307
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auxv_none.go
358
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callers_test.go
7.7
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cgo.go
2.01
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cgo_mmap.go
2.38
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cgo_ppc64x.go
411
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cgo_sigaction.go
3.09
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cgocall.go
21.38
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cgocallback.go
317
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cgocheck.go
6.8
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chan.go
19.71
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chan_test.go
21.27
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chanbarrier_test.go
1.4
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checkptr.go
2.5
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checkptr_test.go
1.27
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closure_test.go
936
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compiler.go
413
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complex.go
1.59
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complex_test.go
1.05
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cpuflags.go
740
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cpuflags_amd64.go
533
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cpuprof.go
6.65
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cputicks.go
478
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crash_cgo_test.go
13.71
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crash_nonunix_test.go
385
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crash_test.go
20.24
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crash_unix_test.go
8.89
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debug.go
1.63
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debug_test.go
6.16
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debugcall.go
2.83
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debuglog.go
17.08
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debuglog_off.go
356
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debuglog_on.go
1.09
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debuglog_test.go
4.56
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defer_test.go
9.98
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defs1_linux.go
844
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defs1_netbsd_386.go
2.84
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defs1_netbsd_amd64.go
3.07
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defs1_netbsd_arm.go
2.96
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defs1_netbsd_arm64.go
3.18
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defs1_solaris_amd64.go
4.02
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defs2_linux.go
3.51
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defs3_linux.go
1.09
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defs_aix.go
4.16
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defs_aix_ppc64.go
3.61
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defs_arm_linux.go
2.67
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defs_darwin.go
3.84
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defs_darwin_386.go
5.98
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defs_darwin_amd64.go
6.07
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defs_darwin_arm.go
3.78
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defs_darwin_arm64.go
3.84
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defs_dragonfly.go
2.54
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defs_dragonfly_amd64.go
3.25
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defs_freebsd.go
3.84
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defs_freebsd_386.go
4.35
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defs_freebsd_amd64.go
4.62
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defs_freebsd_arm.go
3.68
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defs_freebsd_arm64.go
4
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defs_illumos_amd64.go
285
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defs_linux.go
3.04
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defs_linux_386.go
4.05
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defs_linux_amd64.go
4.56
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defs_linux_arm.go
3.31
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defs_linux_arm64.go
3.23
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defs_linux_mips64x.go
3.04
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defs_linux_mipsx.go
3.18
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defs_linux_ppc64.go
3.28
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defs_linux_ppc64le.go
3.28
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defs_linux_riscv64.go
3.27
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defs_linux_s390x.go
2.76
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defs_netbsd.go
2.74
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defs_netbsd_386.go
854
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defs_netbsd_amd64.go
1.01
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defs_netbsd_arm.go
763
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defs_openbsd.go
2.6
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defs_openbsd_386.go
2.63
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defs_openbsd_amd64.go
2.83
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defs_openbsd_arm.go
2.74
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defs_openbsd_arm64.go
2.34
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defs_plan9_386.go
1.47
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defs_plan9_amd64.go
1.66
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defs_plan9_arm.go
1.73
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defs_solaris.go
3.33
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defs_solaris_amd64.go
1003
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defs_windows.go
2.07
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defs_windows_386.go
3.75
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defs_windows_amd64.go
4.51
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defs_windows_arm.go
3.59
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duff_386.s
8.24
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duff_amd64.s
5.53
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duff_arm.s
7.11
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duff_arm64.s
5.25
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duff_mips64x.s
11.28
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duff_ppc64x.s
2.45
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duff_s390x.s
507
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env_plan9.go
855
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env_posix.go
1.82
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env_test.go
1.28
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error.go
7.26
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example_test.go
1.34
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export_aix_test.go
204
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export_arm_test.go
226
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export_darwin_test.go
351
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export_debug_test.go
5.28
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export_debuglog_test.go
1.27
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export_futex_test.go
529
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export_linux_test.go
429
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export_mmap_test.go
481
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export_solaris_test.go
282
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export_test.go
23.58
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export_unix_test.go
2.28
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export_windows_test.go
652
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extern.go
11.6
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fastlog2.go
1.22
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fastlog2_test.go
784
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fastlog2table.go
904
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float.go
1.35
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funcdata.h
2.44
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futex_test.go
2.1
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gc_test.go
13.22
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gcinfo_test.go
6.18
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go_tls.h
366
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hash32.go
2.51
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hash64.go
2.6
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hash_test.go
17.54
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heapdump.go
17.1
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iface.go
15.78
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iface_test.go
6.81
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lfstack.go
1.77
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lfstack_32bit.go
522
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lfstack_64bit.go
2.15
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lfstack_test.go
2.78
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libfuzzer.go
2.58
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libfuzzer_amd64.s
940
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libfuzzer_arm64.s
751
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lock_futex.go
5.06
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lock_js.go
5.45
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lock_sema.go
6.6
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malloc.go
48.32
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malloc_test.go
9.37
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map.go
42.13
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map_benchmark_test.go
10.16
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map_fast32.go
12.18
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map_fast64.go
12.37
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map_faststr.go
13.82
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map_test.go
27.11
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mbarrier.go
12.14
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mbitmap.go
67.53
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mcache.go
5.61
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mcentral.go
7.14
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mem_aix.go
1.93
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mem_bsd.go
2.05
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mem_darwin.go
1.88
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mem_js.go
2.32
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mem_linux.go
5.58
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mem_plan9.go
4.53
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mem_windows.go
3.86
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memclr_386.s
2.4
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memclr_amd64.s
3.65
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memclr_arm.s
2.44
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memclr_arm64.s
3.48
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memclr_mips64x.s
785
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memclr_mipsx.s
1.24
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memclr_plan9_386.s
905
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memclr_plan9_amd64.s
433
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memclr_ppc64x.s
4.2
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memclr_riscv64.s
848
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memclr_s390x.s
1.89
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memclr_wasm.s
544
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memmove_386.s
4.45
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memmove_amd64.s
12.33
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memmove_arm.s
5.9
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memmove_arm64.s
3.56
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memmove_linux_amd64_test.go
1.61
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memmove_mips64x.s
1.82
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memmove_mipsx.s
4.39
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memmove_plan9_386.s
3.06
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memmove_plan9_amd64.s
3.04
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memmove_ppc64x.s
3.33
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memmove_riscv64.s
1.81
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memmove_s390x.s
2.92
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memmove_test.go
10.97
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memmove_wasm.s
1.74
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mfinal.go
14.8
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mfinal_test.go
5.85
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mfixalloc.go
2.72
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mgc.go
74.87
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mgcmark.go
46.5
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mgcscavenge.go
30.95
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mgcscavenge_test.go
12.34
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mgcstack.go
10.55
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mgcsweep.go
14.79
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mgcsweepbuf.go
5.98
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mgcwork.go
14.24
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mheap.go
61.5
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mkduff.go
6.23
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mkfastlog2table.go
1.32
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mkpreempt.go
13.33
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mksizeclasses.go
8.62
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mmap.go
847
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mpagealloc.go
35.25
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mpagealloc_32bit.go
3.75
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mpagealloc_64bit.go
6.51
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mpagealloc_test.go
28.88
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mpagecache.go
5.03
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mpagecache_test.go
9.93
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mpallocbits.go
10.69
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mpallocbits_test.go
12.93
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mprof.go
24.06
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mranges.go
5.41
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msan.go
1.39
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msan0.go
647
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msan_amd64.s
2.03
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msan_arm64.s
1.69
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msize.go
785
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mstats.go
22.62
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mwbbuf.go
10.07
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nbpipe_fcntl_libc_test.go
463
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nbpipe_fcntl_unix_test.go
445
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nbpipe_pipe.go
411
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nbpipe_pipe2.go
509
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nbpipe_test.go
2.17
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net_plan9.go
645
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netpoll.go
14.46
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netpoll_aix.go
4.64
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netpoll_epoll.go
4
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netpoll_fake.go
648
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netpoll_kqueue.go
4.39
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netpoll_solaris.go
10.56
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netpoll_stub.go
1.3
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netpoll_windows.go
4.51
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norace_linux_test.go
888
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norace_test.go
979
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numcpu_freebsd_test.go
381
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os2_aix.go
20.67
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os2_freebsd.go
302
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os2_openbsd.go
296
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os2_plan9.go
1.48
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os2_solaris.go
320
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os3_plan9.go
3.99
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os3_solaris.go
16.92
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os_aix.go
8.29
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os_android.go
463
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os_darwin.go
10.59
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os_darwin_arm.go
749
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os_darwin_arm64.go
416
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os_dragonfly.go
6.2
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os_freebsd.go
10.97
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os_freebsd2.go
478
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os_freebsd_amd64.go
529
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os_freebsd_arm.go
1.32
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os_freebsd_arm64.go
2.97
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os_freebsd_noauxv.go
254
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os_illumos.go
3.93
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os_js.go
2.93
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os_linux.go
13.16
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os_linux_arm.go
1.35
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os_linux_arm64.go
1.02
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os_linux_be64.go
816
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os_linux_generic.go
916
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os_linux_mips64x.go
999
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os_linux_mipsx.go
1.05
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os_linux_noauxv.go
307
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os_linux_novdso.go
298
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os_linux_ppc64x.go
527
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os_linux_riscv64.go
198
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os_linux_s390x.go
455
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os_linux_x86.go
2.69
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os_netbsd.go
8.49
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os_netbsd_386.go
588
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os_netbsd_amd64.go
585
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os_netbsd_arm.go
1.13
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os_netbsd_arm64.go
827
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os_nonopenbsd.go
436
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os_only_solaris.go
356
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os_openbsd.go
7.81
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os_openbsd_arm.go
749
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os_openbsd_arm64.go
714
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os_plan9.go
9.3
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os_plan9_arm.go
462
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os_solaris.go
6.49
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os_windows.go
37.01
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os_windows_arm.go
511
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panic.go
42.23
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panic32.go
4.79
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plugin.go
4.16
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${this.title}
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Code Editor : preempt.go
// Copyright 2019 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // Goroutine preemption // // A goroutine can be preempted at any safe-point. Currently, there // are a few categories of safe-points: // // 1. A blocked safe-point occurs for the duration that a goroutine is // descheduled, blocked on synchronization, or in a system call. // // 2. Synchronous safe-points occur when a running goroutine checks // for a preemption request. // // 3. Asynchronous safe-points occur at any instruction in user code // where the goroutine can be safely paused and a conservative // stack and register scan can find stack roots. The runtime can // stop a goroutine at an async safe-point using a signal. // // At both blocked and synchronous safe-points, a goroutine's CPU // state is minimal and the garbage collector has complete information // about its entire stack. This makes it possible to deschedule a // goroutine with minimal space, and to precisely scan a goroutine's // stack. // // Synchronous safe-points are implemented by overloading the stack // bound check in function prologues. To preempt a goroutine at the // next synchronous safe-point, the runtime poisons the goroutine's // stack bound to a value that will cause the next stack bound check // to fail and enter the stack growth implementation, which will // detect that it was actually a preemption and redirect to preemption // handling. // // Preemption at asynchronous safe-points is implemented by suspending // the thread using an OS mechanism (e.g., signals) and inspecting its // state to determine if the goroutine was at an asynchronous // safe-point. Since the thread suspension itself is generally // asynchronous, it also checks if the running goroutine wants to be // preempted, since this could have changed. If all conditions are // satisfied, it adjusts the signal context to make it look like the // signaled thread just called asyncPreempt and resumes the thread. // asyncPreempt spills all registers and enters the scheduler. // // (An alternative would be to preempt in the signal handler itself. // This would let the OS save and restore the register state and the // runtime would only need to know how to extract potentially // pointer-containing registers from the signal context. However, this // would consume an M for every preempted G, and the scheduler itself // is not designed to run from a signal handler, as it tends to // allocate memory and start threads in the preemption path.) package runtime import ( "runtime/internal/atomic" "runtime/internal/sys" "unsafe" ) type suspendGState struct { g *g // dead indicates the goroutine was not suspended because it // is dead. This goroutine could be reused after the dead // state was observed, so the caller must not assume that it // remains dead. dead bool // stopped indicates that this suspendG transitioned the G to // _Gwaiting via g.preemptStop and thus is responsible for // readying it when done. stopped bool } // suspendG suspends goroutine gp at a safe-point and returns the // state of the suspended goroutine. The caller gets read access to // the goroutine until it calls resumeG. // // It is safe for multiple callers to attempt to suspend the same // goroutine at the same time. The goroutine may execute between // subsequent successful suspend operations. The current // implementation grants exclusive access to the goroutine, and hence // multiple callers will serialize. However, the intent is to grant // shared read access, so please don't depend on exclusive access. // // This must be called from the system stack and the user goroutine on // the current M (if any) must be in a preemptible state. This // prevents deadlocks where two goroutines attempt to suspend each // other and both are in non-preemptible states. There are other ways // to resolve this deadlock, but this seems simplest. // // TODO(austin): What if we instead required this to be called from a // user goroutine? Then we could deschedule the goroutine while // waiting instead of blocking the thread. If two goroutines tried to // suspend each other, one of them would win and the other wouldn't // complete the suspend until it was resumed. We would have to be // careful that they couldn't actually queue up suspend for each other // and then both be suspended. This would also avoid the need for a // kernel context switch in the synchronous case because we could just // directly schedule the waiter. The context switch is unavoidable in // the signal case. // //go:systemstack func suspendG(gp *g) suspendGState { if mp := getg().m; mp.curg != nil && readgstatus(mp.curg) == _Grunning { // Since we're on the system stack of this M, the user // G is stuck at an unsafe point. If another goroutine // were to try to preempt m.curg, it could deadlock. throw("suspendG from non-preemptible goroutine") } // See https://golang.org/cl/21503 for justification of the yield delay. const yieldDelay = 10 * 1000 var nextYield int64 // Drive the goroutine to a preemption point. stopped := false var asyncM *m var asyncGen uint32 var nextPreemptM int64 for i := 0; ; i++ { switch s := readgstatus(gp); s { default: if s&_Gscan != 0 { // Someone else is suspending it. Wait // for them to finish. // // TODO: It would be nicer if we could // coalesce suspends. break } dumpgstatus(gp) throw("invalid g status") case _Gdead: // Nothing to suspend. // // preemptStop may need to be cleared, but // doing that here could race with goroutine // reuse. Instead, goexit0 clears it. return suspendGState{dead: true} case _Gcopystack: // The stack is being copied. We need to wait // until this is done. case _Gpreempted: // We (or someone else) suspended the G. Claim // ownership of it by transitioning it to // _Gwaiting. if !casGFromPreempted(gp, _Gpreempted, _Gwaiting) { break } // We stopped the G, so we have to ready it later. stopped = true s = _Gwaiting fallthrough case _Grunnable, _Gsyscall, _Gwaiting: // Claim goroutine by setting scan bit. // This may race with execution or readying of gp. // The scan bit keeps it from transition state. if !castogscanstatus(gp, s, s|_Gscan) { break } // Clear the preemption request. It's safe to // reset the stack guard because we hold the // _Gscan bit and thus own the stack. gp.preemptStop = false gp.preempt = false gp.stackguard0 = gp.stack.lo + _StackGuard // The goroutine was already at a safe-point // and we've now locked that in. // // TODO: It would be much better if we didn't // leave it in _Gscan, but instead gently // prevented its scheduling until resumption. // Maybe we only use this to bump a suspended // count and the scheduler skips suspended // goroutines? That wouldn't be enough for // {_Gsyscall,_Gwaiting} -> _Grunning. Maybe // for all those transitions we need to check // suspended and deschedule? return suspendGState{g: gp, stopped: stopped} case _Grunning: // Optimization: if there is already a pending preemption request // (from the previous loop iteration), don't bother with the atomics. if gp.preemptStop && gp.preempt && gp.stackguard0 == stackPreempt && asyncM == gp.m && atomic.Load(&asyncM.preemptGen) == asyncGen { break } // Temporarily block state transitions. if !castogscanstatus(gp, _Grunning, _Gscanrunning) { break } // Request synchronous preemption. gp.preemptStop = true gp.preempt = true gp.stackguard0 = stackPreempt // Prepare for asynchronous preemption. asyncM2 := gp.m asyncGen2 := atomic.Load(&asyncM2.preemptGen) needAsync := asyncM != asyncM2 || asyncGen != asyncGen2 asyncM = asyncM2 asyncGen = asyncGen2 casfrom_Gscanstatus(gp, _Gscanrunning, _Grunning) // Send asynchronous preemption. We do this // after CASing the G back to _Grunning // because preemptM may be synchronous and we // don't want to catch the G just spinning on // its status. if preemptMSupported && debug.asyncpreemptoff == 0 && needAsync { // Rate limit preemptM calls. This is // particularly important on Windows // where preemptM is actually // synchronous and the spin loop here // can lead to live-lock. now := nanotime() if now >= nextPreemptM { nextPreemptM = now + yieldDelay/2 preemptM(asyncM) } } } // TODO: Don't busy wait. This loop should really only // be a simple read/decide/CAS loop that only fails if // there's an active race. Once the CAS succeeds, we // should queue up the preemption (which will require // it to be reliable in the _Grunning case, not // best-effort) and then sleep until we're notified // that the goroutine is suspended. if i == 0 { nextYield = nanotime() + yieldDelay } if nanotime() < nextYield { procyield(10) } else { osyield() nextYield = nanotime() + yieldDelay/2 } } } // resumeG undoes the effects of suspendG, allowing the suspended // goroutine to continue from its current safe-point. func resumeG(state suspendGState) { if state.dead { // We didn't actually stop anything. return } gp := state.g switch s := readgstatus(gp); s { default: dumpgstatus(gp) throw("unexpected g status") case _Grunnable | _Gscan, _Gwaiting | _Gscan, _Gsyscall | _Gscan: casfrom_Gscanstatus(gp, s, s&^_Gscan) } if state.stopped { // We stopped it, so we need to re-schedule it. ready(gp, 0, true) } } // canPreemptM reports whether mp is in a state that is safe to preempt. // // It is nosplit because it has nosplit callers. // //go:nosplit func canPreemptM(mp *m) bool { return mp.locks == 0 && mp.mallocing == 0 && mp.preemptoff == "" && mp.p.ptr().status == _Prunning } //go:generate go run mkpreempt.go // asyncPreempt saves all user registers and calls asyncPreempt2. // // When stack scanning encounters an asyncPreempt frame, it scans that // frame and its parent frame conservatively. // // asyncPreempt is implemented in assembly. func asyncPreempt() //go:nosplit func asyncPreempt2() { gp := getg() gp.asyncSafePoint = true if gp.preemptStop { mcall(preemptPark) } else { mcall(gopreempt_m) } gp.asyncSafePoint = false } // asyncPreemptStack is the bytes of stack space required to inject an // asyncPreempt call. var asyncPreemptStack = ^uintptr(0) func init() { f := findfunc(funcPC(asyncPreempt)) total := funcMaxSPDelta(f) f = findfunc(funcPC(asyncPreempt2)) total += funcMaxSPDelta(f) // Add some overhead for return PCs, etc. asyncPreemptStack = uintptr(total) + 8*sys.PtrSize if asyncPreemptStack > _StackLimit { // We need more than the nosplit limit. This isn't // unsafe, but it may limit asynchronous preemption. // // This may be a problem if we start using more // registers. In that case, we should store registers // in a context object. If we pre-allocate one per P, // asyncPreempt can spill just a few registers to the // stack, then grab its context object and spill into // it. When it enters the runtime, it would allocate a // new context for the P. print("runtime: asyncPreemptStack=", asyncPreemptStack, "\n") throw("async stack too large") } } // wantAsyncPreempt returns whether an asynchronous preemption is // queued for gp. func wantAsyncPreempt(gp *g) bool { // Check both the G and the P. return (gp.preempt || gp.m.p != 0 && gp.m.p.ptr().preempt) && readgstatus(gp)&^_Gscan == _Grunning } // isAsyncSafePoint reports whether gp at instruction PC is an // asynchronous safe point. This indicates that: // // 1. It's safe to suspend gp and conservatively scan its stack and // registers. There are no potentially hidden pointer values and it's // not in the middle of an atomic sequence like a write barrier. // // 2. gp has enough stack space to inject the asyncPreempt call. // // 3. It's generally safe to interact with the runtime, even if we're // in a signal handler stopped here. For example, there are no runtime // locks held, so acquiring a runtime lock won't self-deadlock. func isAsyncSafePoint(gp *g, pc, sp, lr uintptr) bool { mp := gp.m // Only user Gs can have safe-points. We check this first // because it's extremely common that we'll catch mp in the // scheduler processing this G preemption. if mp.curg != gp { return false } // Check M state. if mp.p == 0 || !canPreemptM(mp) { return false } // Check stack space. if sp < gp.stack.lo || sp-gp.stack.lo < asyncPreemptStack { return false } // Check if PC is an unsafe-point. f := findfunc(pc) if !f.valid() { // Not Go code. return false } if (GOARCH == "mips" || GOARCH == "mipsle" || GOARCH == "mips64" || GOARCH == "mips64le") && lr == pc+8 && funcspdelta(f, pc, nil) == 0 { // We probably stopped at a half-executed CALL instruction, // where the LR is updated but the PC has not. If we preempt // here we'll see a seemingly self-recursive call, which is in // fact not. // This is normally ok, as we use the return address saved on // stack for unwinding, not the LR value. But if this is a // call to morestack, we haven't created the frame, and we'll // use the LR for unwinding, which will be bad. return false } smi := pcdatavalue(f, _PCDATA_RegMapIndex, pc, nil) if smi == -2 { // Unsafe-point marked by compiler. This includes // atomic sequences (e.g., write barrier) and nosplit // functions (except at calls). return false } if fd := funcdata(f, _FUNCDATA_LocalsPointerMaps); fd == nil || fd == unsafe.Pointer(&no_pointers_stackmap) { // This is assembly code. Don't assume it's // well-formed. We identify assembly code by // checking that it has either no stack map, or // no_pointers_stackmap, which is the stack map // for ones marked as NO_LOCAL_POINTERS. // // TODO: Are there cases that are safe but don't have a // locals pointer map, like empty frame functions? return false } name := funcname(f) if inldata := funcdata(f, _FUNCDATA_InlTree); inldata != nil { inltree := (*[1 << 20]inlinedCall)(inldata) ix := pcdatavalue(f, _PCDATA_InlTreeIndex, pc, nil) if ix >= 0 { name = funcnameFromNameoff(f, inltree[ix].func_) } } if hasPrefix(name, "runtime.") || hasPrefix(name, "runtime/internal/") || hasPrefix(name, "reflect.") { // For now we never async preempt the runtime or // anything closely tied to the runtime. Known issues // include: various points in the scheduler ("don't // preempt between here and here"), much of the defer // implementation (untyped info on stack), bulk write // barriers (write barrier check), // reflect.{makeFuncStub,methodValueCall}. // // TODO(austin): We should improve this, or opt things // in incrementally. return false } return true } var no_pointers_stackmap uint64 // defined in assembly, for NO_LOCAL_POINTERS macro
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