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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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${this.title}
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Code Editor : mgcsweep.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. // Garbage collector: sweeping // The sweeper consists of two different algorithms: // // * The object reclaimer finds and frees unmarked slots in spans. It // can free a whole span if none of the objects are marked, but that // isn't its goal. This can be driven either synchronously by // mcentral.cacheSpan for mcentral spans, or asynchronously by // sweepone from the list of all in-use spans in mheap_.sweepSpans. // // * The span reclaimer looks for spans that contain no marked objects // and frees whole spans. This is a separate algorithm because // freeing whole spans is the hardest task for the object reclaimer, // but is critical when allocating new spans. The entry point for // this is mheap_.reclaim and it's driven by a sequential scan of // the page marks bitmap in the heap arenas. // // Both algorithms ultimately call mspan.sweep, which sweeps a single // heap span. package runtime import ( "runtime/internal/atomic" "unsafe" ) var sweep sweepdata // State of background sweep. type sweepdata struct { lock mutex g *g parked bool started bool nbgsweep uint32 npausesweep uint32 } // finishsweep_m ensures that all spans are swept. // // The world must be stopped. This ensures there are no sweeps in // progress. // //go:nowritebarrier func finishsweep_m() { // Sweeping must be complete before marking commences, so // sweep any unswept spans. If this is a concurrent GC, there // shouldn't be any spans left to sweep, so this should finish // instantly. If GC was forced before the concurrent sweep // finished, there may be spans to sweep. for sweepone() != ^uintptr(0) { sweep.npausesweep++ } nextMarkBitArenaEpoch() } func bgsweep(c chan int) { sweep.g = getg() lock(&sweep.lock) sweep.parked = true c <- 1 goparkunlock(&sweep.lock, waitReasonGCSweepWait, traceEvGoBlock, 1) for { for sweepone() != ^uintptr(0) { sweep.nbgsweep++ Gosched() } for freeSomeWbufs(true) { Gosched() } lock(&sweep.lock) if !isSweepDone() { // This can happen if a GC runs between // gosweepone returning ^0 above // and the lock being acquired. unlock(&sweep.lock) continue } sweep.parked = true goparkunlock(&sweep.lock, waitReasonGCSweepWait, traceEvGoBlock, 1) } } // sweepone sweeps some unswept heap span and returns the number of pages returned // to the heap, or ^uintptr(0) if there was nothing to sweep. func sweepone() uintptr { _g_ := getg() sweepRatio := mheap_.sweepPagesPerByte // For debugging // increment locks to ensure that the goroutine is not preempted // in the middle of sweep thus leaving the span in an inconsistent state for next GC _g_.m.locks++ if atomic.Load(&mheap_.sweepdone) != 0 { _g_.m.locks-- return ^uintptr(0) } atomic.Xadd(&mheap_.sweepers, +1) // Find a span to sweep. var s *mspan sg := mheap_.sweepgen for { s = mheap_.sweepSpans[1-sg/2%2].pop() if s == nil { atomic.Store(&mheap_.sweepdone, 1) break } if state := s.state.get(); state != mSpanInUse { // This can happen if direct sweeping already // swept this span, but in that case the sweep // generation should always be up-to-date. if !(s.sweepgen == sg || s.sweepgen == sg+3) { print("runtime: bad span s.state=", state, " s.sweepgen=", s.sweepgen, " sweepgen=", sg, "\n") throw("non in-use span in unswept list") } continue } if s.sweepgen == sg-2 && atomic.Cas(&s.sweepgen, sg-2, sg-1) { break } } // Sweep the span we found. npages := ^uintptr(0) if s != nil { npages = s.npages if s.sweep(false) { // Whole span was freed. Count it toward the // page reclaimer credit since these pages can // now be used for span allocation. atomic.Xadduintptr(&mheap_.reclaimCredit, npages) } else { // Span is still in-use, so this returned no // pages to the heap and the span needs to // move to the swept in-use list. npages = 0 } } // Decrement the number of active sweepers and if this is the // last one print trace information. if atomic.Xadd(&mheap_.sweepers, -1) == 0 && atomic.Load(&mheap_.sweepdone) != 0 { if debug.gcpacertrace > 0 { print("pacer: sweep done at heap size ", memstats.heap_live>>20, "MB; allocated ", (memstats.heap_live-mheap_.sweepHeapLiveBasis)>>20, "MB during sweep; swept ", mheap_.pagesSwept, " pages at ", sweepRatio, " pages/byte\n") } } _g_.m.locks-- return npages } // isSweepDone reports whether all spans are swept or currently being swept. // // Note that this condition may transition from false to true at any // time as the sweeper runs. It may transition from true to false if a // GC runs; to prevent that the caller must be non-preemptible or must // somehow block GC progress. func isSweepDone() bool { return mheap_.sweepdone != 0 } // Returns only when span s has been swept. //go:nowritebarrier func (s *mspan) ensureSwept() { // Caller must disable preemption. // Otherwise when this function returns the span can become unswept again // (if GC is triggered on another goroutine). _g_ := getg() if _g_.m.locks == 0 && _g_.m.mallocing == 0 && _g_ != _g_.m.g0 { throw("mspan.ensureSwept: m is not locked") } sg := mheap_.sweepgen spangen := atomic.Load(&s.sweepgen) if spangen == sg || spangen == sg+3 { return } // The caller must be sure that the span is a mSpanInUse span. if atomic.Cas(&s.sweepgen, sg-2, sg-1) { s.sweep(false) return } // unfortunate condition, and we don't have efficient means to wait for { spangen := atomic.Load(&s.sweepgen) if spangen == sg || spangen == sg+3 { break } osyield() } } // Sweep frees or collects finalizers for blocks not marked in the mark phase. // It clears the mark bits in preparation for the next GC round. // Returns true if the span was returned to heap. // If preserve=true, don't return it to heap nor relink in mcentral lists; // caller takes care of it. func (s *mspan) sweep(preserve bool) bool { // It's critical that we enter this function with preemption disabled, // GC must not start while we are in the middle of this function. _g_ := getg() if _g_.m.locks == 0 && _g_.m.mallocing == 0 && _g_ != _g_.m.g0 { throw("mspan.sweep: m is not locked") } sweepgen := mheap_.sweepgen if state := s.state.get(); state != mSpanInUse || s.sweepgen != sweepgen-1 { print("mspan.sweep: state=", state, " sweepgen=", s.sweepgen, " mheap.sweepgen=", sweepgen, "\n") throw("mspan.sweep: bad span state") } if trace.enabled { traceGCSweepSpan(s.npages * _PageSize) } atomic.Xadd64(&mheap_.pagesSwept, int64(s.npages)) spc := s.spanclass size := s.elemsize res := false c := _g_.m.mcache freeToHeap := false // The allocBits indicate which unmarked objects don't need to be // processed since they were free at the end of the last GC cycle // and were not allocated since then. // If the allocBits index is >= s.freeindex and the bit // is not marked then the object remains unallocated // since the last GC. // This situation is analogous to being on a freelist. // Unlink & free special records for any objects we're about to free. // Two complications here: // 1. An object can have both finalizer and profile special records. // In such case we need to queue finalizer for execution, // mark the object as live and preserve the profile special. // 2. A tiny object can have several finalizers setup for different offsets. // If such object is not marked, we need to queue all finalizers at once. // Both 1 and 2 are possible at the same time. specialp := &s.specials special := *specialp for special != nil { // A finalizer can be set for an inner byte of an object, find object beginning. objIndex := uintptr(special.offset) / size p := s.base() + objIndex*size mbits := s.markBitsForIndex(objIndex) if !mbits.isMarked() { // This object is not marked and has at least one special record. // Pass 1: see if it has at least one finalizer. hasFin := false endOffset := p - s.base() + size for tmp := special; tmp != nil && uintptr(tmp.offset) < endOffset; tmp = tmp.next { if tmp.kind == _KindSpecialFinalizer { // Stop freeing of object if it has a finalizer. mbits.setMarkedNonAtomic() hasFin = true break } } // Pass 2: queue all finalizers _or_ handle profile record. for special != nil && uintptr(special.offset) < endOffset { // Find the exact byte for which the special was setup // (as opposed to object beginning). p := s.base() + uintptr(special.offset) if special.kind == _KindSpecialFinalizer || !hasFin { // Splice out special record. y := special special = special.next *specialp = special freespecial(y, unsafe.Pointer(p), size) } else { // This is profile record, but the object has finalizers (so kept alive). // Keep special record. specialp = &special.next special = *specialp } } } else { // object is still live: keep special record specialp = &special.next special = *specialp } } if debug.allocfreetrace != 0 || debug.clobberfree != 0 || raceenabled || msanenabled { // Find all newly freed objects. This doesn't have to // efficient; allocfreetrace has massive overhead. mbits := s.markBitsForBase() abits := s.allocBitsForIndex(0) for i := uintptr(0); i < s.nelems; i++ { if !mbits.isMarked() && (abits.index < s.freeindex || abits.isMarked()) { x := s.base() + i*s.elemsize if debug.allocfreetrace != 0 { tracefree(unsafe.Pointer(x), size) } if debug.clobberfree != 0 { clobberfree(unsafe.Pointer(x), size) } if raceenabled { racefree(unsafe.Pointer(x), size) } if msanenabled { msanfree(unsafe.Pointer(x), size) } } mbits.advance() abits.advance() } } // Count the number of free objects in this span. nalloc := uint16(s.countAlloc()) if spc.sizeclass() == 0 && nalloc == 0 { s.needzero = 1 freeToHeap = true } nfreed := s.allocCount - nalloc if nalloc > s.allocCount { print("runtime: nelems=", s.nelems, " nalloc=", nalloc, " previous allocCount=", s.allocCount, " nfreed=", nfreed, "\n") throw("sweep increased allocation count") } s.allocCount = nalloc wasempty := s.nextFreeIndex() == s.nelems s.freeindex = 0 // reset allocation index to start of span. if trace.enabled { getg().m.p.ptr().traceReclaimed += uintptr(nfreed) * s.elemsize } // gcmarkBits becomes the allocBits. // get a fresh cleared gcmarkBits in preparation for next GC s.allocBits = s.gcmarkBits s.gcmarkBits = newMarkBits(s.nelems) // Initialize alloc bits cache. s.refillAllocCache(0) // We need to set s.sweepgen = h.sweepgen only when all blocks are swept, // because of the potential for a concurrent free/SetFinalizer. // But we need to set it before we make the span available for allocation // (return it to heap or mcentral), because allocation code assumes that a // span is already swept if available for allocation. if freeToHeap || nfreed == 0 { // The span must be in our exclusive ownership until we update sweepgen, // check for potential races. if state := s.state.get(); state != mSpanInUse || s.sweepgen != sweepgen-1 { print("mspan.sweep: state=", state, " sweepgen=", s.sweepgen, " mheap.sweepgen=", sweepgen, "\n") throw("mspan.sweep: bad span state after sweep") } // Serialization point. // At this point the mark bits are cleared and allocation ready // to go so release the span. atomic.Store(&s.sweepgen, sweepgen) } if nfreed > 0 && spc.sizeclass() != 0 { c.local_nsmallfree[spc.sizeclass()] += uintptr(nfreed) res = mheap_.central[spc].mcentral.freeSpan(s, preserve, wasempty) // mcentral.freeSpan updates sweepgen } else if freeToHeap { // Free large span to heap // NOTE(rsc,dvyukov): The original implementation of efence // in CL 22060046 used sysFree instead of sysFault, so that // the operating system would eventually give the memory // back to us again, so that an efence program could run // longer without running out of memory. Unfortunately, // calling sysFree here without any kind of adjustment of the // heap data structures means that when the memory does // come back to us, we have the wrong metadata for it, either in // the mspan structures or in the garbage collection bitmap. // Using sysFault here means that the program will run out of // memory fairly quickly in efence mode, but at least it won't // have mysterious crashes due to confused memory reuse. // It should be possible to switch back to sysFree if we also // implement and then call some kind of mheap.deleteSpan. if debug.efence > 0 { s.limit = 0 // prevent mlookup from finding this span sysFault(unsafe.Pointer(s.base()), size) } else { mheap_.freeSpan(s) } c.local_nlargefree++ c.local_largefree += size res = true } if !res { // The span has been swept and is still in-use, so put // it on the swept in-use list. mheap_.sweepSpans[sweepgen/2%2].push(s) } return res } // deductSweepCredit deducts sweep credit for allocating a span of // size spanBytes. This must be performed *before* the span is // allocated to ensure the system has enough credit. If necessary, it // performs sweeping to prevent going in to debt. If the caller will // also sweep pages (e.g., for a large allocation), it can pass a // non-zero callerSweepPages to leave that many pages unswept. // // deductSweepCredit makes a worst-case assumption that all spanBytes // bytes of the ultimately allocated span will be available for object // allocation. // // deductSweepCredit is the core of the "proportional sweep" system. // It uses statistics gathered by the garbage collector to perform // enough sweeping so that all pages are swept during the concurrent // sweep phase between GC cycles. // // mheap_ must NOT be locked. func deductSweepCredit(spanBytes uintptr, callerSweepPages uintptr) { if mheap_.sweepPagesPerByte == 0 { // Proportional sweep is done or disabled. return } if trace.enabled { traceGCSweepStart() } retry: sweptBasis := atomic.Load64(&mheap_.pagesSweptBasis) // Fix debt if necessary. newHeapLive := uintptr(atomic.Load64(&memstats.heap_live)-mheap_.sweepHeapLiveBasis) + spanBytes pagesTarget := int64(mheap_.sweepPagesPerByte*float64(newHeapLive)) - int64(callerSweepPages) for pagesTarget > int64(atomic.Load64(&mheap_.pagesSwept)-sweptBasis) { if sweepone() == ^uintptr(0) { mheap_.sweepPagesPerByte = 0 break } if atomic.Load64(&mheap_.pagesSweptBasis) != sweptBasis { // Sweep pacing changed. Recompute debt. goto retry } } if trace.enabled { traceGCSweepDone() } } // clobberfree sets the memory content at x to bad content, for debugging // purposes. func clobberfree(x unsafe.Pointer, size uintptr) { // size (span.elemsize) is always a multiple of 4. for i := uintptr(0); i < size; i += 4 { *(*uint32)(add(x, i)) = 0xdeadbeef } }
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