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Current Path: /opt/golang/1.17.2/src/runtime

📁 ..
📄 HACKING.md(13.07 KB)
📄 Makefile(178 B)
📄 abi_test.go(2.88 KB)
📄 alg.go(9.45 KB)
📄 asm.s(715 B)
📄 asm_386.s(40.27 KB)
📄 asm_amd64.s(56.93 KB)
📄 asm_arm.s(30.23 KB)
📄 asm_arm64.s(33 KB)
📄 asm_mips64x.s(22.43 KB)
📄 asm_mipsx.s(24.39 KB)
📄 asm_ppc64x.h(1023 B)
📄 asm_ppc64x.s(29.16 KB)
📄 asm_riscv64.s(22.43 KB)
📄 asm_s390x.s(26.04 KB)
📄 asm_wasm.s(9.8 KB)
📄 atomic_arm64.s(259 B)
📄 atomic_mips64x.s(326 B)
📄 atomic_mipsx.s(284 B)
📄 atomic_pointer.go(2.62 KB)
📄 atomic_ppc64x.s(461 B)
📄 atomic_riscv64.s(275 B)
📄 auxv_none.go(360 B)
📄 callers_test.go(7.72 KB)
📁 cgo
📄 cgo.go(2.01 KB)
📄 cgo_mmap.go(2.42 KB)
📄 cgo_ppc64x.go(439 B)
📄 cgo_sigaction.go(3.17 KB)
📄 cgocall.go(18.88 KB)
📄 cgocallback.go(317 B)
📄 cgocheck.go(6.83 KB)
📄 chan.go(23.54 KB)
📄 chan_test.go(23.01 KB)
📄 chanbarrier_test.go(1.4 KB)
📄 checkptr.go(3.29 KB)
📄 checkptr_test.go(1.62 KB)
📄 closure_test.go(937 B)
📄 compiler.go(413 B)
📄 complex.go(1.59 KB)
📄 complex_test.go(1.05 KB)
📄 conv_wasm_test.go(2.96 KB)
📄 cpuflags.go(800 B)
📄 cpuflags_amd64.go(533 B)
📄 cpuflags_arm64.go(334 B)
📄 cpuprof.go(6.92 KB)
📄 cputicks.go(497 B)
📄 crash_cgo_test.go(16.17 KB)
📄 crash_nonunix_test.go(429 B)
📄 crash_test.go(20.96 KB)
📄 crash_unix_test.go(8.52 KB)
📁 debug
📄 debug.go(1.63 KB)
📄 debug_test.go(6.82 KB)
📄 debugcall.go(6.21 KB)
📄 debuglog.go(17.49 KB)
📄 debuglog_off.go(377 B)
📄 debuglog_on.go(1.11 KB)
📄 debuglog_test.go(4.56 KB)
📄 defer_test.go(10.32 KB)
📄 defs1_linux.go(862 B)
📄 defs1_netbsd_386.go(2.84 KB)
📄 defs1_netbsd_amd64.go(3.07 KB)
📄 defs1_netbsd_arm.go(2.96 KB)
📄 defs1_netbsd_arm64.go(3.18 KB)
📄 defs1_solaris_amd64.go(4.02 KB)
📄 defs2_linux.go(3.52 KB)
📄 defs3_linux.go(1.11 KB)
📄 defs_aix.go(4.18 KB)
📄 defs_aix_ppc64.go(3.63 KB)
📄 defs_arm_linux.go(2.69 KB)
📄 defs_darwin.go(3.79 KB)
📄 defs_darwin_amd64.go(6.07 KB)
📄 defs_darwin_arm64.go(3.89 KB)
📄 defs_dragonfly.go(2.63 KB)
📄 defs_dragonfly_amd64.go(3.31 KB)
📄 defs_freebsd.go(3.86 KB)
📄 defs_freebsd_386.go(4.38 KB)
📄 defs_freebsd_amd64.go(4.65 KB)
📄 defs_freebsd_arm.go(3.71 KB)
📄 defs_freebsd_arm64.go(4.03 KB)
📄 defs_illumos_amd64.go(285 B)
📄 defs_linux.go(3.05 KB)
📄 defs_linux_386.go(3.77 KB)
📄 defs_linux_amd64.go(4.28 KB)
📄 defs_linux_arm.go(3.45 KB)
📄 defs_linux_arm64.go(3.21 KB)
📄 defs_linux_mips64x.go(3.24 KB)
📄 defs_linux_mipsx.go(3.21 KB)
📄 defs_linux_ppc64.go(3.28 KB)
📄 defs_linux_ppc64le.go(3.28 KB)
📄 defs_linux_riscv64.go(3.27 KB)
📄 defs_linux_s390x.go(2.76 KB)
📄 defs_netbsd.go(2.76 KB)
📄 defs_netbsd_386.go(872 B)
📄 defs_netbsd_amd64.go(1.03 KB)
📄 defs_netbsd_arm.go(781 B)
📄 defs_openbsd.go(3.1 KB)
📄 defs_openbsd_386.go(2.89 KB)
📄 defs_openbsd_amd64.go(3.09 KB)
📄 defs_openbsd_arm.go(3 KB)
📄 defs_openbsd_arm64.go(2.76 KB)
📄 defs_openbsd_mips64.go(2.66 KB)
📄 defs_plan9_386.go(1.63 KB)
📄 defs_plan9_amd64.go(1.82 KB)
📄 defs_plan9_arm.go(1.73 KB)
📄 defs_solaris.go(3.35 KB)
📄 defs_solaris_amd64.go(1021 B)
📄 defs_windows.go(2.09 KB)
📄 defs_windows_386.go(1.98 KB)
📄 defs_windows_amd64.go(2.71 KB)
📄 defs_windows_arm.go(2.11 KB)
📄 defs_windows_arm64.go(2.63 KB)
📄 duff_386.s(8.24 KB)
📄 duff_amd64.s(5.62 KB)
📄 duff_arm.s(7.11 KB)
📄 duff_arm64.s(5.25 KB)
📄 duff_mips64x.s(11.31 KB)
📄 duff_ppc64x.s(2.43 KB)
📄 duff_riscv64.s(11.38 KB)
📄 duff_s390x.s(507 B)
📄 env_plan9.go(2.99 KB)
📄 env_posix.go(1.95 KB)
📄 env_test.go(1.16 KB)
📄 error.go(9.23 KB)
📄 example_test.go(1.55 KB)
📄 export_aix_test.go(204 B)
📄 export_arm_test.go(226 B)
📄 export_darwin_test.go(351 B)
📄 export_debug_regabiargs_off_test.go(416 B)
📄 export_debug_regabiargs_on_test.go(1.39 KB)
📄 export_debug_test.go(5.86 KB)
📄 export_debuglog_test.go(1.27 KB)
📄 export_futex_test.go(570 B)
📄 export_linux_test.go(429 B)
📄 export_mmap_test.go(571 B)
📄 export_pipe2_test.go(436 B)
📄 export_pipe_test.go(240 B)
📄 export_solaris_test.go(282 B)
📄 export_test.go(30.12 KB)
📄 export_unix_test.go(2.35 KB)
📄 export_windows_test.go(652 B)
📄 extern.go(12.58 KB)
📄 fastlog2.go(1.22 KB)
📄 fastlog2_test.go(784 B)
📄 fastlog2table.go(904 B)
📄 float.go(1.35 KB)
📄 funcdata.h(2.47 KB)
📄 futex_test.go(2.15 KB)
📄 gc_test.go(19.21 KB)
📄 gcinfo_test.go(5.69 KB)
📄 go_tls.h(366 B)
📄 hash32.go(1.61 KB)
📄 hash64.go(2.01 KB)
📄 hash_test.go(16.5 KB)
📄 heapdump.go(17.74 KB)
📄 histogram.go(6.42 KB)
📄 histogram_test.go(1.85 KB)
📄 iface.go(16.13 KB)
📄 iface_test.go(7.51 KB)
📁 internal
📄 lfstack.go(1.77 KB)
📄 lfstack_32bit.go(562 B)
📄 lfstack_64bit.go(2.24 KB)
📄 lfstack_test.go(2.78 KB)
📄 libfuzzer.go(2.6 KB)
📄 libfuzzer_amd64.s(961 B)
📄 libfuzzer_arm64.s(772 B)
📄 lock_futex.go(5.22 KB)
📄 lock_js.go(5.81 KB)
📄 lock_sema.go(6.8 KB)
📄 lockrank.go(11.62 KB)
📄 lockrank_off.go(1.17 KB)
📄 lockrank_on.go(9.84 KB)
📄 lockrank_test.go(1.15 KB)
📄 malloc.go(52.33 KB)
📄 malloc_test.go(10.83 KB)
📄 map.go(42.47 KB)
📄 map_benchmark_test.go(10.51 KB)
📄 map_fast32.go(12.63 KB)
📄 map_fast64.go(12.82 KB)
📄 map_faststr.go(14.15 KB)
📄 map_test.go(27.52 KB)
📄 mbarrier.go(12.2 KB)
📄 mbitmap.go(65.27 KB)
📄 mcache.go(9.68 KB)
📄 mcentral.go(7.8 KB)
📄 mcheckmark.go(2.81 KB)
📄 mem_aix.go(1.94 KB)
📄 mem_bsd.go(2.12 KB)
📄 mem_darwin.go(1.88 KB)
📄 mem_js.go(2.35 KB)
📄 mem_linux.go(5.59 KB)
📄 mem_plan9.go(4.53 KB)
📄 mem_windows.go(3.87 KB)
📄 memclr_386.s(2.42 KB)
📄 memclr_amd64.s(3.89 KB)
📄 memclr_arm.s(2.6 KB)
📄 memclr_arm64.s(3.65 KB)
📄 memclr_mips64x.s(1.75 KB)
📄 memclr_mipsx.s(1.35 KB)
📄 memclr_plan9_386.s(983 B)
📄 memclr_plan9_amd64.s(511 B)
📄 memclr_ppc64x.s(4.31 KB)
📄 memclr_riscv64.s(926 B)
📄 memclr_s390x.s(1.96 KB)
📄 memclr_wasm.s(622 B)
📄 memmove_386.s(4.46 KB)
📄 memmove_amd64.s(12.66 KB)
📄 memmove_arm.s(5.9 KB)
📄 memmove_arm64.s(6 KB)
📄 memmove_linux_amd64_test.go(1.6 KB)
📄 memmove_mips64x.s(1.85 KB)
📄 memmove_mipsx.s(4.42 KB)
📄 memmove_plan9_386.s(3.06 KB)
📄 memmove_plan9_amd64.s(3.04 KB)
📄 memmove_ppc64x.s(4.11 KB)
📄 memmove_riscv64.s(1.81 KB)
📄 memmove_s390x.s(2.92 KB)
📄 memmove_test.go(12.04 KB)
📄 memmove_wasm.s(1.74 KB)
📁 metrics
📄 metrics.go(17.69 KB)
📄 metrics_test.go(12.48 KB)
📄 mfinal.go(15.76 KB)
📄 mfinal_test.go(5.85 KB)
📄 mfixalloc.go(2.73 KB)
📄 mgc.go(55.18 KB)
📄 mgcmark.go(45.54 KB)
📄 mgcpacer.go(29.56 KB)
📄 mgcscavenge.go(35.05 KB)
📄 mgcscavenge_test.go(12.74 KB)
📄 mgcstack.go(10.58 KB)
📄 mgcsweep.go(23.56 KB)
📄 mgcwork.go(12.82 KB)
📄 mheap.go(66.31 KB)
📄 mkduff.go(7.19 KB)
📄 mkfastlog2table.go(1.32 KB)
📄 mkpreempt.go(14.17 KB)
📄 mksizeclasses.go(9.31 KB)
📄 mmap.go(990 B)
📄 mpagealloc.go(36.77 KB)
📄 mpagealloc_32bit.go(3.81 KB)
📄 mpagealloc_64bit.go(6.65 KB)
📄 mpagealloc_test.go(32.38 KB)
📄 mpagecache.go(5.28 KB)
📄 mpagecache_test.go(9.93 KB)
📄 mpallocbits.go(12.01 KB)
📄 mpallocbits_test.go(13.69 KB)
📄 mprof.go(25.82 KB)
📄 mranges.go(11.84 KB)
📄 mranges_test.go(5.68 KB)
📁 msan
📄 msan.go(1.51 KB)
📄 msan0.go(741 B)
📄 msan_amd64.s(2.32 KB)
📄 msan_arm64.s(2.01 KB)
📄 msize.go(777 B)
📄 mspanset.go(12.2 KB)
📄 mstats.go(30.65 KB)
📄 mwbbuf.go(9.3 KB)
📄 nbpipe_fcntl_libc_test.go(499 B)
📄 nbpipe_fcntl_unix_test.go(507 B)
📄 nbpipe_pipe.go(426 B)
📄 nbpipe_pipe2.go(592 B)
📄 nbpipe_test.go(2.26 KB)
📄 net_plan9.go(645 B)
📄 netpoll.go(16.24 KB)
📄 netpoll_aix.go(4.87 KB)
📄 netpoll_epoll.go(4.21 KB)
📄 netpoll_fake.go(670 B)
📄 netpoll_kqueue.go(4.64 KB)
📄 netpoll_os_test.go(360 B)
📄 netpoll_solaris.go(10.75 KB)
📄 netpoll_stub.go(1.42 KB)
📄 netpoll_windows.go(3.75 KB)
📄 norace_linux_test.go(905 B)
📄 norace_test.go(996 B)
📄 numcpu_freebsd_test.go(381 B)
📄 os2_aix.go(20.45 KB)
📄 os2_freebsd.go(302 B)
📄 os2_openbsd.go(296 B)
📄 os2_plan9.go(1.48 KB)
📄 os2_solaris.go(320 B)
📄 os3_plan9.go(3.88 KB)
📄 os3_solaris.go(17.02 KB)
📄 os_aix.go(8.06 KB)
📄 os_android.go(463 B)
📄 os_darwin.go(11.54 KB)
📄 os_darwin_arm64.go(416 B)
📄 os_dragonfly.go(6.46 KB)
📄 os_freebsd.go(11.2 KB)
📄 os_freebsd2.go(507 B)
📄 os_freebsd_amd64.go(529 B)
📄 os_freebsd_arm.go(1.32 KB)
📄 os_freebsd_arm64.go(398 B)
📄 os_freebsd_noauxv.go(264 B)
📄 os_illumos.go(3.93 KB)
📄 os_js.go(3.26 KB)
📄 os_linux.go(13.47 KB)
📄 os_linux_arm.go(1.35 KB)
📄 os_linux_arm64.go(572 B)
📄 os_linux_be64.go(862 B)
📄 os_linux_generic.go(950 B)
📄 os_linux_mips64x.go(1.11 KB)
📄 os_linux_mipsx.go(1.09 KB)
📄 os_linux_noauxv.go(408 B)
📄 os_linux_novdso.go(387 B)
📄 os_linux_ppc64x.go(566 B)
📄 os_linux_riscv64.go(198 B)
📄 os_linux_s390x.go(316 B)
📄 os_linux_x86.go(270 B)
📄 os_netbsd.go(9.09 KB)
📄 os_netbsd_386.go(588 B)
📄 os_netbsd_amd64.go(585 B)
📄 os_netbsd_arm.go(1.13 KB)
📄 os_netbsd_arm64.go(827 B)
📄 os_nonopenbsd.go(456 B)
📄 os_only_solaris.go(376 B)
📄 os_openbsd.go(6.01 KB)
📄 os_openbsd_arm.go(749 B)
📄 os_openbsd_arm64.go(416 B)
📄 os_openbsd_libc.go(1.7 KB)
📄 os_openbsd_mips64.go(416 B)
📄 os_openbsd_syscall.go(1.27 KB)
📄 os_openbsd_syscall1.go(466 B)
📄 os_openbsd_syscall2.go(2.5 KB)
📄 os_plan9.go(10.2 KB)
📄 os_plan9_arm.go(462 B)
📄 os_solaris.go(6.49 KB)
📄 os_windows.go(43.68 KB)
📄 os_windows_arm.go(511 B)
📄 os_windows_arm64.go(339 B)
📄 panic.go(44.28 KB)
📄 panic32.go(4.83 KB)
📄 panic_test.go(1.71 KB)
📄 plugin.go(4.27 KB)
📁 pprof
📄 preempt.go(15.4 KB)
📄 preempt_386.s(1.07 KB)
📄 preempt_amd64.s(1.81 KB)
📄 preempt_arm.s(1.66 KB)
📄 preempt_arm64.s(2.99 KB)
📄 preempt_mips64x.s(2.93 KB)
📄 preempt_mipsx.s(2.89 KB)
📄 preempt_nonwindows.go(309 B)
📄 preempt_ppc64x.s(2.92 KB)
📄 preempt_riscv64.s(2.48 KB)
📄 preempt_s390x.s(1.19 KB)
📄 preempt_wasm.s(365 B)
📄 print.go(5.95 KB)
📄 proc.go(181.46 KB)
📄 proc_runtime_test.go(820 B)
📄 proc_test.go(25.02 KB)
📄 profbuf.go(18.26 KB)
📄 profbuf_test.go(8.65 KB)
📄 proflabel.go(1.52 KB)
📁 race
📄 race.go(18.56 KB)
📄 race0.go(2.81 KB)
📄 race_amd64.s(14.46 KB)
📄 race_arm64.s(13.71 KB)
📄 race_ppc64le.s(17.72 KB)
📄 rand_test.go(783 B)
📄 rdebug.go(553 B)
📄 relax_stub.go(617 B)
📄 rt0_aix_ppc64.s(4.33 KB)
📄 rt0_android_386.s(822 B)
📄 rt0_android_amd64.s(754 B)
📄 rt0_android_arm.s(843 B)
📄 rt0_android_arm64.s(941 B)
📄 rt0_darwin_amd64.s(399 B)
📄 rt0_darwin_arm64.s(2.27 KB)
📄 rt0_dragonfly_amd64.s(448 B)
📄 rt0_freebsd_386.s(454 B)
📄 rt0_freebsd_amd64.s(442 B)
📄 rt0_freebsd_arm.s(298 B)
📄 rt0_freebsd_arm64.s(2.46 KB)
📄 rt0_illumos_amd64.s(311 B)
📄 rt0_ios_amd64.s(425 B)
📄 rt0_ios_arm64.s(425 B)
📄 rt0_js_wasm.s(2.3 KB)
📄 rt0_linux_386.s(450 B)
📄 rt0_linux_amd64.s(307 B)
📄 rt0_linux_arm.s(1007 B)
📄 rt0_linux_arm64.s(2.39 KB)
📄 rt0_linux_mips64x.s(1.03 KB)
📄 rt0_linux_mipsx.s(835 B)
📄 rt0_linux_ppc64.s(865 B)
📄 rt0_linux_ppc64le.s(3.88 KB)
📄 rt0_linux_riscv64.s(370 B)
📄 rt0_linux_s390x.s(676 B)
📄 rt0_netbsd_386.s(452 B)
📄 rt0_netbsd_amd64.s(309 B)
📄 rt0_netbsd_arm.s(296 B)
📄 rt0_netbsd_arm64.s(2.38 KB)
📄 rt0_openbsd_386.s(454 B)
📄 rt0_openbsd_amd64.s(311 B)
📄 rt0_openbsd_arm.s(298 B)
📄 rt0_openbsd_arm64.s(2.54 KB)
📄 rt0_openbsd_mips64.s(976 B)
📄 rt0_plan9_386.s(523 B)
📄 rt0_plan9_amd64.s(481 B)
📄 rt0_plan9_arm.s(397 B)
📄 rt0_solaris_amd64.s(311 B)
📄 rt0_windows_386.s(1.28 KB)
📄 rt0_windows_amd64.s(986 B)
📄 rt0_windows_arm.s(386 B)
📄 rt0_windows_arm64.s(725 B)
📄 runtime-gdb.py(15.02 KB)
📄 runtime-gdb_test.go(20.19 KB)
📄 runtime-lldb_test.go(4.95 KB)
📄 runtime.go(1.42 KB)
📄 runtime1.go(12.63 KB)
📄 runtime2.go(42.27 KB)
📄 runtime_linux_test.go(1.46 KB)
📄 runtime_mmap_test.go(1.91 KB)
📄 runtime_test.go(7.81 KB)
📄 runtime_unix_test.go(1.29 KB)
📄 rwmutex.go(3.53 KB)
📄 rwmutex_test.go(4.03 KB)
📄 select.go(14.45 KB)
📄 sema.go(16.08 KB)
📄 sema_test.go(2.5 KB)
📄 semasleep_test.go(1.65 KB)
📄 sigaction.go(543 B)
📄 signal_386.go(1.72 KB)
📄 signal_aix_ppc64.go(3.56 KB)
📄 signal_amd64.go(2.71 KB)
📄 signal_arm.go(2.56 KB)
📄 signal_arm64.go(3.16 KB)
📄 signal_darwin.go(2.13 KB)
📄 signal_darwin_amd64.go(3.85 KB)
📄 signal_darwin_arm64.go(3.6 KB)
📄 signal_dragonfly.go(2.17 KB)
📄 signal_dragonfly_amd64.go(2.01 KB)
📄 signal_freebsd.go(2.2 KB)
📄 signal_freebsd_386.go(1.55 KB)
📄 signal_freebsd_amd64.go(2.03 KB)
📄 signal_freebsd_arm.go(2.18 KB)
📄 signal_freebsd_arm64.go(3.23 KB)
📄 signal_linux_386.go(1.59 KB)
📄 signal_linux_amd64.go(2.05 KB)
📄 signal_linux_arm.go(2.13 KB)
📄 signal_linux_arm64.go(2.95 KB)
📄 signal_linux_mips64x.go(3.39 KB)
📄 signal_linux_mipsx.go(3.7 KB)
📄 signal_linux_ppc64x.go(3.46 KB)
📄 signal_linux_riscv64.go(2.92 KB)
📄 signal_linux_s390x.go(4.43 KB)
📄 signal_mips64x.go(3.2 KB)
📄 signal_mipsx.go(3.07 KB)
📄 signal_netbsd.go(2.18 KB)
📄 signal_netbsd_386.go(1.76 KB)
📄 signal_netbsd_amd64.go(2.33 KB)
📄 signal_netbsd_arm.go(2.3 KB)
📄 signal_netbsd_arm64.go(3.4 KB)
📄 signal_openbsd.go(2.18 KB)
📄 signal_openbsd_386.go(1.58 KB)
📄 signal_openbsd_amd64.go(2.04 KB)
📄 signal_openbsd_arm.go(2.12 KB)
📄 signal_openbsd_arm64.go(3.38 KB)
📄 signal_openbsd_mips64.go(3.28 KB)
📄 signal_plan9.go(1.93 KB)
📄 signal_ppc64x.go(3.64 KB)
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📄 write_err_android.go(4.65 KB)
📄 zcallback_windows.go(155 B)
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📄 zcallback_windows_arm.s(89.34 KB)
📄 zcallback_windows_arm64.s(89.34 KB)

Editing: metrics.go

// Copyright 2020 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

// Metrics implementation exported to runtime/metrics.

import (
	"runtime/internal/atomic"
	"unsafe"
)

var (
	// metrics is a map of runtime/metrics keys to
	// data used by the runtime to sample each metric's
	// value.
	metricsSema uint32 = 1
	metricsInit bool
	metrics     map[string]metricData

sizeClassBuckets []float64
	timeHistBuckets  []float64
)

type metricData struct {
	// deps is the set of runtime statistics that this metric
	// depends on. Before compute is called, the statAggregate
	// which will be passed must ensure() these dependencies.
	deps statDepSet

// compute is a function that populates a metricValue
	// given a populated statAggregate structure.
	compute func(in *statAggregate, out *metricValue)
}

// initMetrics initializes the metrics map if it hasn't been yet.
//
// metricsSema must be held.
func initMetrics() {
	if metricsInit {
		return
	}

sizeClassBuckets = make([]float64, _NumSizeClasses, _NumSizeClasses+1)
	// Skip size class 0 which is a stand-in for large objects, but large
	// objects are tracked separately (and they actually get placed in
	// the last bucket, not the first).
	sizeClassBuckets[0] = 1 // The smallest allocation is 1 byte in size.
	for i := 1; i < _NumSizeClasses; i++ {
		// Size classes have an inclusive upper-bound
		// and exclusive lower bound (e.g. 48-byte size class is
		// (32, 48]) whereas we want and inclusive lower-bound
		// and exclusive upper-bound (e.g. 48-byte size class is
		// [33, 49). We can achieve this by shifting all bucket
		// boundaries up by 1.
		//
		// Also, a float64 can precisely represent integers with
		// value up to 2^53 and size classes are relatively small
		// (nowhere near 2^48 even) so this will give us exact
		// boundaries.
		sizeClassBuckets[i] = float64(class_to_size[i] + 1)
	}
	sizeClassBuckets = append(sizeClassBuckets, float64Inf())

timeHistBuckets = timeHistogramMetricsBuckets()
	metrics = map[string]metricData{
		"/gc/cycles/automatic:gc-cycles": {
			deps: makeStatDepSet(sysStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = in.sysStats.gcCyclesDone - in.sysStats.gcCyclesForced
			},
		},
		"/gc/cycles/forced:gc-cycles": {
			deps: makeStatDepSet(sysStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = in.sysStats.gcCyclesForced
			},
		},
		"/gc/cycles/total:gc-cycles": {
			deps: makeStatDepSet(sysStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = in.sysStats.gcCyclesDone
			},
		},
		"/gc/heap/allocs-by-size:bytes": {
			deps: makeStatDepSet(heapStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				hist := out.float64HistOrInit(sizeClassBuckets)
				hist.counts[len(hist.counts)-1] = uint64(in.heapStats.largeAllocCount)
				// Cut off the first index which is ostensibly for size class 0,
				// but large objects are tracked separately so it's actually unused.
				for i, count := range in.heapStats.smallAllocCount[1:] {
					hist.counts[i] = uint64(count)
				}
			},
		},
		"/gc/heap/allocs:bytes": {
			deps: makeStatDepSet(heapStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = in.heapStats.totalAllocated
			},
		},
		"/gc/heap/allocs:objects": {
			deps: makeStatDepSet(heapStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = in.heapStats.totalAllocs
			},
		},
		"/gc/heap/frees-by-size:bytes": {
			deps: makeStatDepSet(heapStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				hist := out.float64HistOrInit(sizeClassBuckets)
				hist.counts[len(hist.counts)-1] = uint64(in.heapStats.largeFreeCount)
				// Cut off the first index which is ostensibly for size class 0,
				// but large objects are tracked separately so it's actually unused.
				for i, count := range in.heapStats.smallFreeCount[1:] {
					hist.counts[i] = uint64(count)
				}
			},
		},
		"/gc/heap/frees:bytes": {
			deps: makeStatDepSet(heapStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = in.heapStats.totalFreed
			},
		},
		"/gc/heap/frees:objects": {
			deps: makeStatDepSet(heapStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = in.heapStats.totalFrees
			},
		},
		"/gc/heap/goal:bytes": {
			deps: makeStatDepSet(sysStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = in.sysStats.heapGoal
			},
		},
		"/gc/heap/objects:objects": {
			deps: makeStatDepSet(heapStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = in.heapStats.numObjects
			},
		},
		"/gc/heap/tiny/allocs:objects": {
			deps: makeStatDepSet(heapStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = uint64(in.heapStats.tinyAllocCount)
			},
		},
		"/gc/pauses:seconds": {
			compute: func(_ *statAggregate, out *metricValue) {
				hist := out.float64HistOrInit(timeHistBuckets)
				// The bottom-most bucket, containing negative values, is tracked
				// as a separately as underflow, so fill that in manually and then
				// iterate over the rest.
				hist.counts[0] = atomic.Load64(&memstats.gcPauseDist.underflow)
				for i := range memstats.gcPauseDist.counts {
					hist.counts[i+1] = atomic.Load64(&memstats.gcPauseDist.counts[i])
				}
			},
		},
		"/memory/classes/heap/free:bytes": {
			deps: makeStatDepSet(heapStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = uint64(in.heapStats.committed - in.heapStats.inHeap -
					in.heapStats.inStacks - in.heapStats.inWorkBufs -
					in.heapStats.inPtrScalarBits)
			},
		},
		"/memory/classes/heap/objects:bytes": {
			deps: makeStatDepSet(heapStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = in.heapStats.inObjects
			},
		},
		"/memory/classes/heap/released:bytes": {
			deps: makeStatDepSet(heapStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = uint64(in.heapStats.released)
			},
		},
		"/memory/classes/heap/stacks:bytes": {
			deps: makeStatDepSet(heapStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = uint64(in.heapStats.inStacks)
			},
		},
		"/memory/classes/heap/unused:bytes": {
			deps: makeStatDepSet(heapStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = uint64(in.heapStats.inHeap) - in.heapStats.inObjects
			},
		},
		"/memory/classes/metadata/mcache/free:bytes": {
			deps: makeStatDepSet(sysStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = in.sysStats.mCacheSys - in.sysStats.mCacheInUse
			},
		},
		"/memory/classes/metadata/mcache/inuse:bytes": {
			deps: makeStatDepSet(sysStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = in.sysStats.mCacheInUse
			},
		},
		"/memory/classes/metadata/mspan/free:bytes": {
			deps: makeStatDepSet(sysStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = in.sysStats.mSpanSys - in.sysStats.mSpanInUse
			},
		},
		"/memory/classes/metadata/mspan/inuse:bytes": {
			deps: makeStatDepSet(sysStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = in.sysStats.mSpanInUse
			},
		},
		"/memory/classes/metadata/other:bytes": {
			deps: makeStatDepSet(heapStatsDep, sysStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = uint64(in.heapStats.inWorkBufs+in.heapStats.inPtrScalarBits) + in.sysStats.gcMiscSys
			},
		},
		"/memory/classes/os-stacks:bytes": {
			deps: makeStatDepSet(sysStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = in.sysStats.stacksSys
			},
		},
		"/memory/classes/other:bytes": {
			deps: makeStatDepSet(sysStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = in.sysStats.otherSys
			},
		},
		"/memory/classes/profiling/buckets:bytes": {
			deps: makeStatDepSet(sysStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = in.sysStats.buckHashSys
			},
		},
		"/memory/classes/total:bytes": {
			deps: makeStatDepSet(heapStatsDep, sysStatsDep),
			compute: func(in *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = uint64(in.heapStats.committed+in.heapStats.released) +
					in.sysStats.stacksSys + in.sysStats.mSpanSys +
					in.sysStats.mCacheSys + in.sysStats.buckHashSys +
					in.sysStats.gcMiscSys + in.sysStats.otherSys
			},
		},
		"/sched/goroutines:goroutines": {
			compute: func(_ *statAggregate, out *metricValue) {
				out.kind = metricKindUint64
				out.scalar = uint64(gcount())
			},
		},
		"/sched/latencies:seconds": {
			compute: func(_ *statAggregate, out *metricValue) {
				hist := out.float64HistOrInit(timeHistBuckets)
				hist.counts[0] = atomic.Load64(&sched.timeToRun.underflow)
				for i := range sched.timeToRun.counts {
					hist.counts[i+1] = atomic.Load64(&sched.timeToRun.counts[i])
				}
			},
		},
	}
	metricsInit = true
}

// statDep is a dependency on a group of statistics
// that a metric might have.
type statDep uint

const (
	heapStatsDep statDep = iota // corresponds to heapStatsAggregate
	sysStatsDep                 // corresponds to sysStatsAggregate
	numStatsDeps
)

// statDepSet represents a set of statDeps.
//
// Under the hood, it's a bitmap.
type statDepSet [1]uint64

// makeStatDepSet creates a new statDepSet from a list of statDeps.
func makeStatDepSet(deps ...statDep) statDepSet {
	var s statDepSet
	for _, d := range deps {
		s[d/64] |= 1 << (d % 64)
	}
	return s
}

// differennce returns set difference of s from b as a new set.
func (s statDepSet) difference(b statDepSet) statDepSet {
	var c statDepSet
	for i := range s {
		c[i] = s[i] &^ b[i]
	}
	return c
}

// union returns the union of the two sets as a new set.
func (s statDepSet) union(b statDepSet) statDepSet {
	var c statDepSet
	for i := range s {
		c[i] = s[i] | b[i]
	}
	return c
}

// empty returns true if there are no dependencies in the set.
func (s *statDepSet) empty() bool {
	for _, c := range s {
		if c != 0 {
			return false
		}
	}
	return true
}

// has returns true if the set contains a given statDep.
func (s *statDepSet) has(d statDep) bool {
	return s[d/64]&(1<<(d%64)) != 0
}

// heapStatsAggregate represents memory stats obtained from the
// runtime. This set of stats is grouped together because they
// depend on each other in some way to make sense of the runtime's
// current heap memory use. They're also sharded across Ps, so it
// makes sense to grab them all at once.
type heapStatsAggregate struct {
	heapStatsDelta

// Derived from values in heapStatsDelta.

// inObjects is the bytes of memory occupied by objects,
	inObjects uint64

// numObjects is the number of live objects in the heap.
	numObjects uint64

// totalAllocated is the total bytes of heap objects allocated
	// over the lifetime of the program.
	totalAllocated uint64

// totalFreed is the total bytes of heap objects freed
	// over the lifetime of the program.
	totalFreed uint64

// totalAllocs is the number of heap objects allocated over
	// the lifetime of the program.
	totalAllocs uint64

// totalFrees is the number of heap objects freed over
	// the lifetime of the program.
	totalFrees uint64
}

// compute populates the heapStatsAggregate with values from the runtime.
func (a *heapStatsAggregate) compute() {
	memstats.heapStats.read(&a.heapStatsDelta)

// Calculate derived stats.
	a.totalAllocs = uint64(a.largeAllocCount)
	a.totalFrees = uint64(a.largeFreeCount)
	a.totalAllocated = uint64(a.largeAlloc)
	a.totalFreed = uint64(a.largeFree)
	for i := range a.smallAllocCount {
		na := uint64(a.smallAllocCount[i])
		nf := uint64(a.smallFreeCount[i])
		a.totalAllocs += na
		a.totalFrees += nf
		a.totalAllocated += na * uint64(class_to_size[i])
		a.totalFreed += nf * uint64(class_to_size[i])
	}
	a.inObjects = a.totalAllocated - a.totalFreed
	a.numObjects = a.totalAllocs - a.totalFrees
}

// sysStatsAggregate represents system memory stats obtained
// from the runtime. This set of stats is grouped together because
// they're all relatively cheap to acquire and generally independent
// of one another and other runtime memory stats. The fact that they
// may be acquired at different times, especially with respect to
// heapStatsAggregate, means there could be some skew, but because of
// these stats are independent, there's no real consistency issue here.
type sysStatsAggregate struct {
	stacksSys      uint64
	mSpanSys       uint64
	mSpanInUse     uint64
	mCacheSys      uint64
	mCacheInUse    uint64
	buckHashSys    uint64
	gcMiscSys      uint64
	otherSys       uint64
	heapGoal       uint64
	gcCyclesDone   uint64
	gcCyclesForced uint64
}

// compute populates the sysStatsAggregate with values from the runtime.
func (a *sysStatsAggregate) compute() {
	a.stacksSys = memstats.stacks_sys.load()
	a.buckHashSys = memstats.buckhash_sys.load()
	a.gcMiscSys = memstats.gcMiscSys.load()
	a.otherSys = memstats.other_sys.load()
	a.heapGoal = atomic.Load64(&gcController.heapGoal)
	a.gcCyclesDone = uint64(memstats.numgc)
	a.gcCyclesForced = uint64(memstats.numforcedgc)

systemstack(func() {
		lock(&mheap_.lock)
		a.mSpanSys = memstats.mspan_sys.load()
		a.mSpanInUse = uint64(mheap_.spanalloc.inuse)
		a.mCacheSys = memstats.mcache_sys.load()
		a.mCacheInUse = uint64(mheap_.cachealloc.inuse)
		unlock(&mheap_.lock)
	})
}

// statAggregate is the main driver of the metrics implementation.
//
// It contains multiple aggregates of runtime statistics, as well
// as a set of these aggregates that it has populated. The aggergates
// are populated lazily by its ensure method.
type statAggregate struct {
	ensured   statDepSet
	heapStats heapStatsAggregate
	sysStats  sysStatsAggregate
}

// ensure populates statistics aggregates determined by deps if they
// haven't yet been populated.
func (a *statAggregate) ensure(deps *statDepSet) {
	missing := deps.difference(a.ensured)
	if missing.empty() {
		return
	}
	for i := statDep(0); i < numStatsDeps; i++ {
		if !missing.has(i) {
			continue
		}
		switch i {
		case heapStatsDep:
			a.heapStats.compute()
		case sysStatsDep:
			a.sysStats.compute()
		}
	}
	a.ensured = a.ensured.union(missing)
}

// metricValidKind is a runtime copy of runtime/metrics.ValueKind and
// must be kept structurally identical to that type.
type metricKind int

const (
	// These values must be kept identical to their corresponding Kind* values
	// in the runtime/metrics package.
	metricKindBad metricKind = iota
	metricKindUint64
	metricKindFloat64
	metricKindFloat64Histogram
)

// metricSample is a runtime copy of runtime/metrics.Sample and
// must be kept structurally identical to that type.
type metricSample struct {
	name  string
	value metricValue
}

// metricValue is a runtime copy of runtime/metrics.Sample and
// must be kept structurally identical to that type.
type metricValue struct {
	kind    metricKind
	scalar  uint64         // contains scalar values for scalar Kinds.
	pointer unsafe.Pointer // contains non-scalar values.
}

// float64HistOrInit tries to pull out an existing float64Histogram
// from the value, but if none exists, then it allocates one with
// the given buckets.
func (v *metricValue) float64HistOrInit(buckets []float64) *metricFloat64Histogram {
	var hist *metricFloat64Histogram
	if v.kind == metricKindFloat64Histogram && v.pointer != nil {
		hist = (*metricFloat64Histogram)(v.pointer)
	} else {
		v.kind = metricKindFloat64Histogram
		hist = new(metricFloat64Histogram)
		v.pointer = unsafe.Pointer(hist)
	}
	hist.buckets = buckets
	if len(hist.counts) != len(hist.buckets)-1 {
		hist.counts = make([]uint64, len(buckets)-1)
	}
	return hist
}

// metricFloat64Histogram is a runtime copy of runtime/metrics.Float64Histogram
// and must be kept structurally identical to that type.
type metricFloat64Histogram struct {
	counts  []uint64
	buckets []float64
}

// agg is used by readMetrics, and is protected by metricsSema.
//
// Managed as a global variable because its pointer will be
// an argument to a dynamically-defined function, and we'd
// like to avoid it escaping to the heap.
var agg statAggregate

// readMetrics is the implementation of runtime/metrics.Read.
//
//go:linkname readMetrics runtime/metrics.runtime_readMetrics
func readMetrics(samplesp unsafe.Pointer, len int, cap int) {
	// Construct a slice from the args.
	sl := slice{samplesp, len, cap}
	samples := *(*[]metricSample)(unsafe.Pointer(&sl))

// Acquire the metricsSema but with handoff. This operation
	// is expensive enough that queueing up goroutines and handing
	// off between them will be noticeably better-behaved.
	semacquire1(&metricsSema, true, 0, 0)

// Ensure the map is initialized.
	initMetrics()

// Clear agg defensively.
	agg = statAggregate{}

// Sample.
	for i := range samples {
		sample := &samples[i]
		data, ok := metrics[sample.name]
		if !ok {
			sample.value.kind = metricKindBad
			continue
		}
		// Ensure we have all the stats we need.
		// agg is populated lazily.
		agg.ensure(&data.deps)

// Compute the value based on the stats we have.
		data.compute(&agg, &sample.value)
	}

semrelease(&metricsSema)
}

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