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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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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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Code Editor : mgcwork.go
// Copyright 2009 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. package runtime import ( "runtime/internal/atomic" "runtime/internal/sys" "unsafe" ) const ( _WorkbufSize = 2048 // in bytes; larger values result in less contention // workbufAlloc is the number of bytes to allocate at a time // for new workbufs. This must be a multiple of pageSize and // should be a multiple of _WorkbufSize. // // Larger values reduce workbuf allocation overhead. Smaller // values reduce heap fragmentation. workbufAlloc = 32 << 10 ) // throwOnGCWork causes any operations that add pointers to a gcWork // buffer to throw. // // TODO(austin): This is a temporary debugging measure for issue // #27993. To be removed before release. var throwOnGCWork bool func init() { if workbufAlloc%pageSize != 0 || workbufAlloc%_WorkbufSize != 0 { throw("bad workbufAlloc") } } // Garbage collector work pool abstraction. // // This implements a producer/consumer model for pointers to grey // objects. A grey object is one that is marked and on a work // queue. A black object is marked and not on a work queue. // // Write barriers, root discovery, stack scanning, and object scanning // produce pointers to grey objects. Scanning consumes pointers to // grey objects, thus blackening them, and then scans them, // potentially producing new pointers to grey objects. // A gcWork provides the interface to produce and consume work for the // garbage collector. // // A gcWork can be used on the stack as follows: // // (preemption must be disabled) // gcw := &getg().m.p.ptr().gcw // .. call gcw.put() to produce and gcw.tryGet() to consume .. // // It's important that any use of gcWork during the mark phase prevent // the garbage collector from transitioning to mark termination since // gcWork may locally hold GC work buffers. This can be done by // disabling preemption (systemstack or acquirem). type gcWork struct { // wbuf1 and wbuf2 are the primary and secondary work buffers. // // This can be thought of as a stack of both work buffers' // pointers concatenated. When we pop the last pointer, we // shift the stack up by one work buffer by bringing in a new // full buffer and discarding an empty one. When we fill both // buffers, we shift the stack down by one work buffer by // bringing in a new empty buffer and discarding a full one. // This way we have one buffer's worth of hysteresis, which // amortizes the cost of getting or putting a work buffer over // at least one buffer of work and reduces contention on the // global work lists. // // wbuf1 is always the buffer we're currently pushing to and // popping from and wbuf2 is the buffer that will be discarded // next. // // Invariant: Both wbuf1 and wbuf2 are nil or neither are. wbuf1, wbuf2 *workbuf // Bytes marked (blackened) on this gcWork. This is aggregated // into work.bytesMarked by dispose. bytesMarked uint64 // Scan work performed on this gcWork. This is aggregated into // gcController by dispose and may also be flushed by callers. scanWork int64 // flushedWork indicates that a non-empty work buffer was // flushed to the global work list since the last gcMarkDone // termination check. Specifically, this indicates that this // gcWork may have communicated work to another gcWork. flushedWork bool // pauseGen causes put operations to spin while pauseGen == // gcWorkPauseGen if debugCachedWork is true. pauseGen uint32 // putGen is the pauseGen of the last putGen. putGen uint32 // pauseStack is the stack at which this P was paused if // debugCachedWork is true. pauseStack [16]uintptr } // Most of the methods of gcWork are go:nowritebarrierrec because the // write barrier itself can invoke gcWork methods but the methods are // not generally re-entrant. Hence, if a gcWork method invoked the // write barrier while the gcWork was in an inconsistent state, and // the write barrier in turn invoked a gcWork method, it could // permanently corrupt the gcWork. func (w *gcWork) init() { w.wbuf1 = getempty() wbuf2 := trygetfull() if wbuf2 == nil { wbuf2 = getempty() } w.wbuf2 = wbuf2 } func (w *gcWork) checkPut(ptr uintptr, ptrs []uintptr) { if debugCachedWork { alreadyFailed := w.putGen == w.pauseGen w.putGen = w.pauseGen if !canPreemptM(getg().m) { // If we were to spin, the runtime may // deadlock. Since we can't be preempted, the // spin could prevent gcMarkDone from // finishing the ragged barrier, which is what // releases us from the spin. return } for atomic.Load(&gcWorkPauseGen) == w.pauseGen { } if throwOnGCWork { printlock() if alreadyFailed { println("runtime: checkPut already failed at this generation") } println("runtime: late gcWork put") if ptr != 0 { gcDumpObject("ptr", ptr, ^uintptr(0)) } for _, ptr := range ptrs { gcDumpObject("ptrs", ptr, ^uintptr(0)) } println("runtime: paused at") for _, pc := range w.pauseStack { if pc == 0 { break } f := findfunc(pc) if f.valid() { // Obviously this doesn't // relate to ancestor // tracebacks, but this // function prints what we // want. printAncestorTracebackFuncInfo(f, pc) } else { println("\tunknown PC ", hex(pc), "\n") } } throw("throwOnGCWork") } } } // put enqueues a pointer for the garbage collector to trace. // obj must point to the beginning of a heap object or an oblet. //go:nowritebarrierrec func (w *gcWork) put(obj uintptr) { w.checkPut(obj, nil) flushed := false wbuf := w.wbuf1 if wbuf == nil { w.init() wbuf = w.wbuf1 // wbuf is empty at this point. } else if wbuf.nobj == len(wbuf.obj) { w.wbuf1, w.wbuf2 = w.wbuf2, w.wbuf1 wbuf = w.wbuf1 if wbuf.nobj == len(wbuf.obj) { putfull(wbuf) w.flushedWork = true wbuf = getempty() w.wbuf1 = wbuf flushed = true } } wbuf.obj[wbuf.nobj] = obj wbuf.nobj++ // If we put a buffer on full, let the GC controller know so // it can encourage more workers to run. We delay this until // the end of put so that w is in a consistent state, since // enlistWorker may itself manipulate w. if flushed && gcphase == _GCmark { gcController.enlistWorker() } } // putFast does a put and reports whether it can be done quickly // otherwise it returns false and the caller needs to call put. //go:nowritebarrierrec func (w *gcWork) putFast(obj uintptr) bool { w.checkPut(obj, nil) wbuf := w.wbuf1 if wbuf == nil { return false } else if wbuf.nobj == len(wbuf.obj) { return false } wbuf.obj[wbuf.nobj] = obj wbuf.nobj++ return true } // putBatch performs a put on every pointer in obj. See put for // constraints on these pointers. // //go:nowritebarrierrec func (w *gcWork) putBatch(obj []uintptr) { if len(obj) == 0 { return } w.checkPut(0, obj) flushed := false wbuf := w.wbuf1 if wbuf == nil { w.init() wbuf = w.wbuf1 } for len(obj) > 0 { for wbuf.nobj == len(wbuf.obj) { putfull(wbuf) w.flushedWork = true w.wbuf1, w.wbuf2 = w.wbuf2, getempty() wbuf = w.wbuf1 flushed = true } n := copy(wbuf.obj[wbuf.nobj:], obj) wbuf.nobj += n obj = obj[n:] } if flushed && gcphase == _GCmark { gcController.enlistWorker() } } // tryGet dequeues a pointer for the garbage collector to trace. // // If there are no pointers remaining in this gcWork or in the global // queue, tryGet returns 0. Note that there may still be pointers in // other gcWork instances or other caches. //go:nowritebarrierrec func (w *gcWork) tryGet() uintptr { wbuf := w.wbuf1 if wbuf == nil { w.init() wbuf = w.wbuf1 // wbuf is empty at this point. } if wbuf.nobj == 0 { w.wbuf1, w.wbuf2 = w.wbuf2, w.wbuf1 wbuf = w.wbuf1 if wbuf.nobj == 0 { owbuf := wbuf wbuf = trygetfull() if wbuf == nil { return 0 } putempty(owbuf) w.wbuf1 = wbuf } } wbuf.nobj-- return wbuf.obj[wbuf.nobj] } // tryGetFast dequeues a pointer for the garbage collector to trace // if one is readily available. Otherwise it returns 0 and // the caller is expected to call tryGet(). //go:nowritebarrierrec func (w *gcWork) tryGetFast() uintptr { wbuf := w.wbuf1 if wbuf == nil { return 0 } if wbuf.nobj == 0 { return 0 } wbuf.nobj-- return wbuf.obj[wbuf.nobj] } // dispose returns any cached pointers to the global queue. // The buffers are being put on the full queue so that the // write barriers will not simply reacquire them before the // GC can inspect them. This helps reduce the mutator's // ability to hide pointers during the concurrent mark phase. // //go:nowritebarrierrec func (w *gcWork) dispose() { if wbuf := w.wbuf1; wbuf != nil { if wbuf.nobj == 0 { putempty(wbuf) } else { putfull(wbuf) w.flushedWork = true } w.wbuf1 = nil wbuf = w.wbuf2 if wbuf.nobj == 0 { putempty(wbuf) } else { putfull(wbuf) w.flushedWork = true } w.wbuf2 = nil } if w.bytesMarked != 0 { // dispose happens relatively infrequently. If this // atomic becomes a problem, we should first try to // dispose less and if necessary aggregate in a per-P // counter. atomic.Xadd64(&work.bytesMarked, int64(w.bytesMarked)) w.bytesMarked = 0 } if w.scanWork != 0 { atomic.Xaddint64(&gcController.scanWork, w.scanWork) w.scanWork = 0 } } // balance moves some work that's cached in this gcWork back on the // global queue. //go:nowritebarrierrec func (w *gcWork) balance() { if w.wbuf1 == nil { return } if wbuf := w.wbuf2; wbuf.nobj != 0 { w.checkPut(0, wbuf.obj[:wbuf.nobj]) putfull(wbuf) w.flushedWork = true w.wbuf2 = getempty() } else if wbuf := w.wbuf1; wbuf.nobj > 4 { w.checkPut(0, wbuf.obj[:wbuf.nobj]) w.wbuf1 = handoff(wbuf) w.flushedWork = true // handoff did putfull } else { return } // We flushed a buffer to the full list, so wake a worker. if gcphase == _GCmark { gcController.enlistWorker() } } // empty reports whether w has no mark work available. //go:nowritebarrierrec func (w *gcWork) empty() bool { return w.wbuf1 == nil || (w.wbuf1.nobj == 0 && w.wbuf2.nobj == 0) } // Internally, the GC work pool is kept in arrays in work buffers. // The gcWork interface caches a work buffer until full (or empty) to // avoid contending on the global work buffer lists. type workbufhdr struct { node lfnode // must be first nobj int } //go:notinheap type workbuf struct { workbufhdr // account for the above fields obj [(_WorkbufSize - unsafe.Sizeof(workbufhdr{})) / sys.PtrSize]uintptr } // workbuf factory routines. These funcs are used to manage the // workbufs. // If the GC asks for some work these are the only routines that // make wbufs available to the GC. func (b *workbuf) checknonempty() { if b.nobj == 0 { throw("workbuf is empty") } } func (b *workbuf) checkempty() { if b.nobj != 0 { throw("workbuf is not empty") } } // getempty pops an empty work buffer off the work.empty list, // allocating new buffers if none are available. //go:nowritebarrier func getempty() *workbuf { var b *workbuf if work.empty != 0 { b = (*workbuf)(work.empty.pop()) if b != nil { b.checkempty() } } if b == nil { // Allocate more workbufs. var s *mspan if work.wbufSpans.free.first != nil { lock(&work.wbufSpans.lock) s = work.wbufSpans.free.first if s != nil { work.wbufSpans.free.remove(s) work.wbufSpans.busy.insert(s) } unlock(&work.wbufSpans.lock) } if s == nil { systemstack(func() { s = mheap_.allocManual(workbufAlloc/pageSize, &memstats.gc_sys) }) if s == nil { throw("out of memory") } // Record the new span in the busy list. lock(&work.wbufSpans.lock) work.wbufSpans.busy.insert(s) unlock(&work.wbufSpans.lock) } // Slice up the span into new workbufs. Return one and // put the rest on the empty list. for i := uintptr(0); i+_WorkbufSize <= workbufAlloc; i += _WorkbufSize { newb := (*workbuf)(unsafe.Pointer(s.base() + i)) newb.nobj = 0 lfnodeValidate(&newb.node) if i == 0 { b = newb } else { putempty(newb) } } } return b } // putempty puts a workbuf onto the work.empty list. // Upon entry this go routine owns b. The lfstack.push relinquishes ownership. //go:nowritebarrier func putempty(b *workbuf) { b.checkempty() work.empty.push(&b.node) } // putfull puts the workbuf on the work.full list for the GC. // putfull accepts partially full buffers so the GC can avoid competing // with the mutators for ownership of partially full buffers. //go:nowritebarrier func putfull(b *workbuf) { b.checknonempty() work.full.push(&b.node) } // trygetfull tries to get a full or partially empty workbuffer. // If one is not immediately available return nil //go:nowritebarrier func trygetfull() *workbuf { b := (*workbuf)(work.full.pop()) if b != nil { b.checknonempty() return b } return b } //go:nowritebarrier func handoff(b *workbuf) *workbuf { // Make new buffer with half of b's pointers. b1 := getempty() n := b.nobj / 2 b.nobj -= n b1.nobj = n memmove(unsafe.Pointer(&b1.obj[0]), unsafe.Pointer(&b.obj[b.nobj]), uintptr(n)*unsafe.Sizeof(b1.obj[0])) // Put b on full list - let first half of b get stolen. putfull(b) return b1 } // prepareFreeWorkbufs moves busy workbuf spans to free list so they // can be freed to the heap. This must only be called when all // workbufs are on the empty list. func prepareFreeWorkbufs() { lock(&work.wbufSpans.lock) if work.full != 0 { throw("cannot free workbufs when work.full != 0") } // Since all workbufs are on the empty list, we don't care // which ones are in which spans. We can wipe the entire empty // list and move all workbuf spans to the free list. work.empty = 0 work.wbufSpans.free.takeAll(&work.wbufSpans.busy) unlock(&work.wbufSpans.lock) } // freeSomeWbufs frees some workbufs back to the heap and returns // true if it should be called again to free more. func freeSomeWbufs(preemptible bool) bool { const batchSize = 64 // ~1–2 µs per span. lock(&work.wbufSpans.lock) if gcphase != _GCoff || work.wbufSpans.free.isEmpty() { unlock(&work.wbufSpans.lock) return false } systemstack(func() { gp := getg().m.curg for i := 0; i < batchSize && !(preemptible && gp.preempt); i++ { span := work.wbufSpans.free.first if span == nil { break } work.wbufSpans.free.remove(span) mheap_.freeManual(span, &memstats.gc_sys) } }) more := !work.wbufSpans.free.isEmpty() unlock(&work.wbufSpans.lock) return more }
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