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Current Path: /opt/golang/1.22.0/src/runtime

📁 ..
📄 HACKING.md(13.85 KB)
📄 Makefile(178 B)
📄 abi_test.go(2.83 KB)
📄 alg.go(10.99 KB)
📄 align_runtime_test.go(1.82 KB)
📄 align_test.go(5.37 KB)
📄 arena.go(31.66 KB)
📄 arena_test.go(13.39 KB)
📁 asan
📄 asan.go(1.55 KB)
📄 asan0.go(760 B)
📄 asan_amd64.s(2.45 KB)
📄 asan_arm64.s(2.14 KB)
📄 asan_loong64.s(2.12 KB)
📄 asan_ppc64le.s(2.75 KB)
📄 asan_riscv64.s(1.92 KB)
📄 asm.s(719 B)
📄 asm_386.s(42.54 KB)
📄 asm_amd64.h(631 B)
📄 asm_amd64.s(60.09 KB)
📄 asm_arm.s(31.58 KB)
📄 asm_arm64.s(43.33 KB)
📄 asm_loong64.s(27.58 KB)
📄 asm_mips64x.s(24.34 KB)
📄 asm_mipsx.s(25.82 KB)
📄 asm_ppc64x.h(1.93 KB)
📄 asm_ppc64x.s(45.19 KB)
📄 asm_riscv64.s(26.97 KB)
📄 asm_s390x.s(27.55 KB)
📄 asm_wasm.s(11.82 KB)
📄 atomic_arm64.s(259 B)
📄 atomic_loong64.s(245 B)
📄 atomic_mips64x.s(300 B)
📄 atomic_mipsx.s(262 B)
📄 atomic_pointer.go(3.66 KB)
📄 atomic_ppc64x.s(437 B)
📄 atomic_riscv64.s(275 B)
📄 auxv_none.go(298 B)
📄 callers_test.go(12.13 KB)
📁 cgo
📄 cgo.go(2.5 KB)
📄 cgo_mmap.go(2.42 KB)
📄 cgo_ppc64x.go(418 B)
📄 cgo_sigaction.go(3.28 KB)
📄 cgocall.go(23.23 KB)
📄 cgocallback.go(317 B)
📄 cgocheck.go(7.97 KB)
📄 chan.go(23.74 KB)
📄 chan_test.go(23.44 KB)
📄 chanbarrier_test.go(1.4 KB)
📄 checkptr.go(3.29 KB)
📄 checkptr_test.go(2.86 KB)
📄 closure_test.go(937 B)
📄 compiler.go(410 B)
📄 complex.go(1.59 KB)
📄 complex_test.go(1.05 KB)
📄 conv_wasm_test.go(2.96 KB)
📄 coro.go(4.92 KB)
📁 coverage
📄 covercounter.go(749 B)
📄 covermeta.go(2.4 KB)
📄 cpuflags.go(810 B)
📄 cpuflags_amd64.go(533 B)
📄 cpuflags_arm64.go(312 B)
📄 cpuprof.go(7.94 KB)
📄 cputicks.go(437 B)
📄 crash_cgo_test.go(23.35 KB)
📄 crash_test.go(23.12 KB)
📄 crash_unix_test.go(9.19 KB)
📄 create_file_nounix.go(305 B)
📄 create_file_unix.go(368 B)
📁 debug
📄 debug.go(3.53 KB)
📄 debug_test.go(7.99 KB)
📄 debugcall.go(6.75 KB)
📄 debuglog.go(18.24 KB)
📄 debuglog_off.go(357 B)
📄 debuglog_on.go(1.09 KB)
📄 debuglog_test.go(4.9 KB)
📄 defer_test.go(11.4 KB)
📄 defs1_linux.go(845 B)
📄 defs1_netbsd_386.go(2.91 KB)
📄 defs1_netbsd_amd64.go(3.14 KB)
📄 defs1_netbsd_arm.go(3.03 KB)
📄 defs1_netbsd_arm64.go(3.25 KB)
📄 defs1_solaris_amd64.go(4.01 KB)
📄 defs2_linux.go(3.22 KB)
📄 defs3_linux.go(1.09 KB)
📄 defs_aix.go(4.17 KB)
📄 defs_aix_ppc64.go(3.63 KB)
📄 defs_arm_linux.go(2.67 KB)
📄 defs_darwin.go(4.18 KB)
📄 defs_darwin_amd64.go(6.34 KB)
📄 defs_darwin_arm64.go(4.17 KB)
📄 defs_dragonfly.go(2.73 KB)
📄 defs_dragonfly_amd64.go(3.41 KB)
📄 defs_freebsd.go(3.96 KB)
📄 defs_freebsd_386.go(4.52 KB)
📄 defs_freebsd_amd64.go(4.79 KB)
📄 defs_freebsd_arm.go(3.92 KB)
📄 defs_freebsd_arm64.go(4.18 KB)
📄 defs_freebsd_riscv64.go(4.19 KB)
📄 defs_illumos_amd64.go(285 B)
📄 defs_linux.go(2.92 KB)
📄 defs_linux_386.go(4.2 KB)
📄 defs_linux_amd64.go(4.7 KB)
📄 defs_linux_arm.go(3.89 KB)
📄 defs_linux_arm64.go(3.62 KB)
📄 defs_linux_loong64.go(3.43 KB)
📄 defs_linux_mips64x.go(3.6 KB)
📄 defs_linux_mipsx.go(3.6 KB)
📄 defs_linux_ppc64.go(3.69 KB)
📄 defs_linux_ppc64le.go(3.69 KB)
📄 defs_linux_riscv64.go(3.81 KB)
📄 defs_linux_s390x.go(3.16 KB)
📄 defs_netbsd.go(2.83 KB)
📄 defs_netbsd_386.go(855 B)
📄 defs_netbsd_amd64.go(1.01 KB)
📄 defs_netbsd_arm.go(764 B)
📄 defs_openbsd.go(3.06 KB)
📄 defs_openbsd_386.go(2.91 KB)
📄 defs_openbsd_amd64.go(3.11 KB)
📄 defs_openbsd_arm.go(3.03 KB)
📄 defs_openbsd_arm64.go(2.78 KB)
📄 defs_openbsd_mips64.go(2.75 KB)
📄 defs_openbsd_ppc64.go(3 KB)
📄 defs_openbsd_riscv64.go(2.89 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(3.32 KB)
📄 defs_solaris_amd64.go(1004 B)
📄 defs_windows.go(2.25 KB)
📄 defs_windows_386.go(2.28 KB)
📄 defs_windows_amd64.go(3.19 KB)
📄 defs_windows_arm.go(2.57 KB)
📄 defs_windows_arm64.go(3.07 KB)
📄 duff_386.s(8.24 KB)
📄 duff_amd64.s(5.64 KB)
📄 duff_arm.s(7.11 KB)
📄 duff_arm64.s(5.27 KB)
📄 duff_loong64.s(11.9 KB)
📄 duff_mips64x.s(11.28 KB)
📄 duff_ppc64x.s(7.06 KB)
📄 duff_riscv64.s(11.4 KB)
📄 duff_s390x.s(507 B)
📄 ehooks_test.go(2.04 KB)
📄 env_plan9.go(3 KB)
📄 env_posix.go(1.56 KB)
📄 env_test.go(1.16 KB)
📄 error.go(9.29 KB)
📄 example_test.go(1.55 KB)
📄 exithook.go(2.32 KB)
📄 export_aix_test.go(207 B)
📄 export_arm_test.go(226 B)
📄 export_darwin_test.go(207 B)
📄 export_debug_amd64_test.go(3.6 KB)
📄 export_debug_arm64_test.go(3.49 KB)
📄 export_debug_ppc64le_test.go(3.5 KB)
📄 export_debug_test.go(5.07 KB)
📄 export_debuglog_test.go(1.27 KB)
📄 export_linux_test.go(378 B)
📄 export_mmap_test.go(429 B)
📄 export_pipe2_test.go(310 B)
📄 export_pipe_test.go(219 B)
📄 export_test.go(50.52 KB)
📄 export_unix_test.go(2.27 KB)
📄 export_windows_test.go(903 B)
📄 extern.go(18.58 KB)
📄 fastlog2.go(1.22 KB)
📄 fastlog2_test.go(784 B)
📄 fastlog2table.go(904 B)
📄 fds_nonunix.go(256 B)
📄 fds_test.go(1.43 KB)
📄 fds_unix.go(1.27 KB)
📄 float.go(1.35 KB)
📄 float_test.go(699 B)
📄 funcdata.h(2.53 KB)
📄 gc_test.go(20.32 KB)
📄 gcinfo_test.go(5.95 KB)
📄 go_tls.h(366 B)
📄 hash32.go(1.58 KB)
📄 hash64.go(1.95 KB)
📄 hash_test.go(17.24 KB)
📄 heap_test.go(529 B)
📄 heapdump.go(17.88 KB)
📄 histogram.go(7.3 KB)
📄 histogram_test.go(3.51 KB)
📄 iface.go(20.92 KB)
📄 iface_test.go(7.45 KB)
📄 import_test.go(1.42 KB)
📄 importx_test.go(763 B)
📁 internal
📄 lfstack.go(2.03 KB)
📄 lfstack_test.go(2.74 KB)
📄 libfuzzer.go(6.34 KB)
📄 libfuzzer_amd64.s(5.03 KB)
📄 libfuzzer_arm64.s(3.15 KB)
📄 lock_futex.go(5.4 KB)
📄 lock_js.go(7.28 KB)
📄 lock_sema.go(6.75 KB)
📄 lock_wasip1.go(2.01 KB)
📄 lockrank.go(18.19 KB)
📄 lockrank_off.go(1.17 KB)
📄 lockrank_on.go(10.27 KB)
📄 lockrank_test.go(856 B)
📄 malloc.go(58.5 KB)
📄 malloc_test.go(10.64 KB)
📄 map.go(52.17 KB)
📄 map_benchmark_test.go(10.59 KB)
📄 map_fast32.go(12.74 KB)
📄 map_fast64.go(12.92 KB)
📄 map_faststr.go(14.32 KB)
📄 map_test.go(31.75 KB)
📄 mbarrier.go(13.78 KB)
📄 mbitmap.go(22.54 KB)
📄 mbitmap_allocheaders.go(44.67 KB)
📄 mbitmap_noallocheaders.go(28.95 KB)
📄 mcache.go(10 KB)
📄 mcentral.go(8.05 KB)
📄 mcheckmark.go(2.85 KB)
📄 mem.go(6.72 KB)
📄 mem_aix.go(2.01 KB)
📄 mem_bsd.go(2.21 KB)
📄 mem_darwin.go(1.96 KB)
📄 mem_js.go(457 B)
📄 mem_linux.go(4.98 KB)
📄 mem_plan9.go(447 B)
📄 mem_sbrk.go(4.19 KB)
📄 mem_wasip1.go(392 B)
📄 mem_wasm.go(488 B)
📄 mem_windows.go(3.88 KB)
📄 memclr_386.s(2.38 KB)
📄 memclr_amd64.s(4.91 KB)
📄 memclr_arm.s(2.6 KB)
📄 memclr_arm64.s(3.62 KB)
📄 memclr_loong64.s(843 B)
📄 memclr_mips64x.s(1.72 KB)
📄 memclr_mipsx.s(1.32 KB)
📄 memclr_plan9_386.s(983 B)
📄 memclr_plan9_amd64.s(511 B)
📄 memclr_ppc64x.s(4.44 KB)
📄 memclr_riscv64.s(1.71 KB)
📄 memclr_s390x.s(1.96 KB)
📄 memclr_wasm.s(485 B)
📄 memmove_386.s(4.42 KB)
📄 memmove_amd64.s(12.48 KB)
📄 memmove_arm.s(5.9 KB)
📄 memmove_arm64.s(5.96 KB)
📄 memmove_linux_amd64_test.go(1.53 KB)
📄 memmove_loong64.s(1.87 KB)
📄 memmove_mips64x.s(1.83 KB)
📄 memmove_mipsx.s(4.4 KB)
📄 memmove_plan9_386.s(3.06 KB)
📄 memmove_plan9_amd64.s(3.04 KB)
📄 memmove_ppc64x.s(4.91 KB)
📄 memmove_riscv64.s(5.46 KB)
📄 memmove_s390x.s(2.92 KB)
📄 memmove_test.go(21.23 KB)
📄 memmove_wasm.s(479 B)
📁 metrics
📄 metrics.go(26.01 KB)
📄 metrics_test.go(42.46 KB)
📄 mfinal.go(18.91 KB)
📄 mfinal_test.go(5.57 KB)
📄 mfixalloc.go(3.13 KB)
📄 mgc.go(59.29 KB)
📄 mgclimit.go(17.28 KB)
📄 mgclimit_test.go(9.02 KB)
📄 mgcmark.go(53.07 KB)
📄 mgcpacer.go(55.36 KB)
📄 mgcpacer_test.go(39.26 KB)
📄 mgcscavenge.go(52.32 KB)
📄 mgcscavenge_test.go(25.2 KB)
📄 mgcstack.go(10.58 KB)
📄 mgcsweep.go(32.26 KB)
📄 mgcwork.go(12.89 KB)
📄 mheap.go(72.64 KB)
📄 minmax.go(1.46 KB)
📄 minmax_test.go(3.31 KB)
📄 mkduff.go(8.04 KB)
📄 mkfastlog2table.go(3.08 KB)
📄 mklockrank.go(9 KB)
📄 mkpreempt.go(15.33 KB)
📄 mksizeclasses.go(9.52 KB)
📄 mmap.go(844 B)
📄 mpagealloc.go(39.23 KB)
📄 mpagealloc_32bit.go(4.56 KB)
📄 mpagealloc_64bit.go(9.34 KB)
📄 mpagealloc_test.go(32.59 KB)
📄 mpagecache.go(5.59 KB)
📄 mpagecache_test.go(10.79 KB)
📄 mpallocbits.go(12.58 KB)
📄 mpallocbits_test.go(13.69 KB)
📄 mprof.go(47.4 KB)
📄 mranges.go(14.46 KB)
📄 mranges_test.go(5.68 KB)
📁 msan
📄 msan.go(1.5 KB)
📄 msan0.go(725 B)
📄 msan_amd64.s(2.3 KB)
📄 msan_arm64.s(1.98 KB)
📄 msan_loong64.s(1.96 KB)
📄 msize_allocheaders.go(1.32 KB)
📄 msize_noallocheaders.go(915 B)
📄 mspanset.go(13.12 KB)
📄 mstats.go(33.81 KB)
📄 mwbbuf.go(8.13 KB)
📄 nbpipe_pipe.go(405 B)
📄 nbpipe_pipe2.go(344 B)
📄 nbpipe_pipe_test.go(706 B)
📄 nbpipe_test.go(1.99 KB)
📄 net_plan9.go(645 B)
📄 netpoll.go(20.55 KB)
📄 netpoll_aix.go(5.06 KB)
📄 netpoll_epoll.go(4.4 KB)
📄 netpoll_fake.go(664 B)
📄 netpoll_kqueue.go(5.62 KB)
📄 netpoll_os_test.go(520 B)
📄 netpoll_solaris.go(11.2 KB)
📄 netpoll_stub.go(1.48 KB)
📄 netpoll_wasip1.go(6.08 KB)
📄 netpoll_windows.go(4.01 KB)
📄 nonwindows_stub.go(729 B)
📄 norace_linux_test.go(915 B)
📄 norace_test.go(983 B)
📄 numcpu_freebsd_test.go(381 B)
📄 os2_aix.go(20.88 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(3.94 KB)
📄 os3_solaris.go(17.59 KB)
📄 os_aix.go(8.89 KB)
📄 os_android.go(463 B)
📄 os_darwin.go(11.92 KB)
📄 os_darwin_arm64.go(329 B)
📄 os_dragonfly.go(7.14 KB)
📄 os_freebsd.go(11.64 KB)
📄 os_freebsd2.go(603 B)
📄 os_freebsd_amd64.go(658 B)
📄 os_freebsd_arm.go(1.45 KB)
📄 os_freebsd_arm64.go(320 B)
📄 os_freebsd_noauxv.go(241 B)
📄 os_freebsd_riscv64.go(198 B)
📄 os_illumos.go(3.93 KB)
📄 os_js.go(767 B)
📄 os_linux.go(25.71 KB)
📄 os_linux_arm.go(1.51 KB)
📄 os_linux_arm64.go(478 B)
📄 os_linux_be64.go(806 B)
📄 os_linux_generic.go(870 B)
📄 os_linux_loong64.go(263 B)
📄 os_linux_mips64x.go(996 B)
📄 os_linux_mipsx.go(987 B)
📄 os_linux_noauxv.go(337 B)
📄 os_linux_novdso.go(347 B)
📄 os_linux_ppc64x.go(526 B)
📄 os_linux_riscv64.go(198 B)
📄 os_linux_s390x.go(825 B)
📄 os_linux_x86.go(234 B)
📄 os_netbsd.go(10.12 KB)
📄 os_netbsd_386.go(617 B)
📄 os_netbsd_amd64.go(614 B)
📄 os_netbsd_arm.go(1.07 KB)
📄 os_netbsd_arm64.go(769 B)
📄 os_nonopenbsd.go(437 B)
📄 os_only_solaris.go(357 B)
📄 os_openbsd.go(6.23 KB)
📄 os_openbsd_arm.go(662 B)
📄 os_openbsd_arm64.go(329 B)
📄 os_openbsd_libc.go(1.49 KB)
📄 os_openbsd_mips64.go(329 B)
📄 os_openbsd_syscall.go(1.36 KB)
📄 os_openbsd_syscall1.go(441 B)
📄 os_openbsd_syscall2.go(2.51 KB)
📄 os_plan9.go(10.18 KB)
📄 os_plan9_arm.go(375 B)
📄 os_solaris.go(6.62 KB)
📄 os_unix.go(436 B)
📄 os_unix_nonlinux.go(374 B)
📄 os_wasip1.go(7 KB)
📄 os_wasm.go(3.15 KB)
📄 os_windows.go(41.39 KB)
📄 os_windows_arm.go(511 B)
📄 os_windows_arm64.go(339 B)
📄 pagetrace_off.go(550 B)
📄 pagetrace_on.go(10.36 KB)
📄 panic.go(41.85 KB)
📄 panic32.go(4.8 KB)
📄 panic_test.go(1.71 KB)
📄 panicnil_test.go(1.25 KB)
📄 pinner.go(10.98 KB)
📄 pinner_test.go(11.04 KB)
📄 plugin.go(4.37 KB)
📁 pprof
📄 preempt.go(15.03 KB)
📄 preempt_386.s(824 B)
📄 preempt_amd64.s(1.67 KB)
📄 preempt_arm.s(1.49 KB)
📄 preempt_arm64.s(1.97 KB)
📄 preempt_loong64.s(2.41 KB)
📄 preempt_mips64x.s(2.72 KB)
📄 preempt_mipsx.s(2.68 KB)
📄 preempt_nonwindows.go(290 B)
📄 preempt_ppc64x.s(2.72 KB)
📄 preempt_riscv64.s(2.26 KB)
📄 preempt_s390x.s(1.01 KB)
📄 preempt_wasm.s(176 B)
📄 print.go(5.92 KB)
📄 proc.go(204.28 KB)
📄 proc_runtime_test.go(1.38 KB)
📄 proc_test.go(25.85 KB)
📄 profbuf.go(18.26 KB)
📄 profbuf_test.go(8.54 KB)
📄 proflabel.go(1.52 KB)
📁 race
📄 race.go(18.81 KB)
📄 race0.go(2.79 KB)
📄 race_amd64.s(13.94 KB)
📄 race_arm64.s(14.21 KB)
📄 race_ppc64le.s(15.93 KB)
📄 race_s390x.s(11.99 KB)
📄 rand.go(7.11 KB)
📄 rand_test.go(1.95 KB)
📄 rdebug.go(550 B)
📄 retry.go(760 B)
📄 rt0_aix_ppc64.s(4.09 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(1.69 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(1.88 KB)
📄 rt0_freebsd_riscv64.s(2.72 KB)
📄 rt0_illumos_amd64.s(311 B)
📄 rt0_ios_amd64.s(425 B)
📄 rt0_ios_arm64.s(425 B)
📄 rt0_js_wasm.s(1.53 KB)
📄 rt0_linux_386.s(450 B)
📄 rt0_linux_amd64.s(307 B)
📄 rt0_linux_arm.s(1007 B)
📄 rt0_linux_arm64.s(1.81 KB)
📄 rt0_linux_loong64.s(2.01 KB)
📄 rt0_linux_mips64x.s(1014 B)
📄 rt0_linux_mipsx.s(797 B)
📄 rt0_linux_ppc64.s(847 B)
📄 rt0_linux_ppc64le.s(2.89 KB)
📄 rt0_linux_riscv64.s(2.65 KB)
📄 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(1.8 KB)
📄 rt0_openbsd_386.s(454 B)
📄 rt0_openbsd_amd64.s(311 B)
📄 rt0_openbsd_arm.s(298 B)
📄 rt0_openbsd_arm64.s(1.96 KB)
📄 rt0_openbsd_mips64.s(976 B)
📄 rt0_openbsd_ppc64.s(370 B)
📄 rt0_openbsd_riscv64.s(372 B)
📄 rt0_plan9_386.s(523 B)
📄 rt0_plan9_amd64.s(481 B)
📄 rt0_plan9_arm.s(397 B)
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Editing: mstats.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.

// Memory statistics

package runtime

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

type mstats struct {
	// Statistics about malloc heap.
	heapStats consistentHeapStats

// Statistics about stacks.
	stacks_sys sysMemStat // only counts newosproc0 stack in mstats; differs from MemStats.StackSys

// Statistics about allocation of low-level fixed-size structures.
	mspan_sys    sysMemStat
	mcache_sys   sysMemStat
	buckhash_sys sysMemStat // profiling bucket hash table

// Statistics about GC overhead.
	gcMiscSys sysMemStat // updated atomically or during STW

// Miscellaneous statistics.
	other_sys sysMemStat // updated atomically or during STW

// Statistics about the garbage collector.

// Protected by mheap or worldsema during GC.
	last_gc_unix    uint64 // last gc (in unix time)
	pause_total_ns  uint64
	pause_ns        [256]uint64 // circular buffer of recent gc pause lengths
	pause_end       [256]uint64 // circular buffer of recent gc end times (nanoseconds since 1970)
	numgc           uint32
	numforcedgc     uint32  // number of user-forced GCs
	gc_cpu_fraction float64 // fraction of CPU time used by GC

last_gc_nanotime uint64 // last gc (monotonic time)
	lastHeapInUse    uint64 // heapInUse at mark termination of the previous GC

enablegc bool
}

var memstats mstats

// A MemStats records statistics about the memory allocator.
type MemStats struct {
	// General statistics.

// Alloc is bytes of allocated heap objects.
	//
	// This is the same as HeapAlloc (see below).
	Alloc uint64

// TotalAlloc is cumulative bytes allocated for heap objects.
	//
	// TotalAlloc increases as heap objects are allocated, but
	// unlike Alloc and HeapAlloc, it does not decrease when
	// objects are freed.
	TotalAlloc uint64

// Sys is the total bytes of memory obtained from the OS.
	//
	// Sys is the sum of the XSys fields below. Sys measures the
	// virtual address space reserved by the Go runtime for the
	// heap, stacks, and other internal data structures. It's
	// likely that not all of the virtual address space is backed
	// by physical memory at any given moment, though in general
	// it all was at some point.
	Sys uint64

// Lookups is the number of pointer lookups performed by the
	// runtime.
	//
	// This is primarily useful for debugging runtime internals.
	Lookups uint64

// Mallocs is the cumulative count of heap objects allocated.
	// The number of live objects is Mallocs - Frees.
	Mallocs uint64

// Frees is the cumulative count of heap objects freed.
	Frees uint64

// Heap memory statistics.
	//
	// Interpreting the heap statistics requires some knowledge of
	// how Go organizes memory. Go divides the virtual address
	// space of the heap into "spans", which are contiguous
	// regions of memory 8K or larger. A span may be in one of
	// three states:
	//
	// An "idle" span contains no objects or other data. The
	// physical memory backing an idle span can be released back
	// to the OS (but the virtual address space never is), or it
	// can be converted into an "in use" or "stack" span.
	//
	// An "in use" span contains at least one heap object and may
	// have free space available to allocate more heap objects.
	//
	// A "stack" span is used for goroutine stacks. Stack spans
	// are not considered part of the heap. A span can change
	// between heap and stack memory; it is never used for both
	// simultaneously.

// HeapAlloc is bytes of allocated heap objects.
	//
	// "Allocated" heap objects include all reachable objects, as
	// well as unreachable objects that the garbage collector has
	// not yet freed. Specifically, HeapAlloc increases as heap
	// objects are allocated and decreases as the heap is swept
	// and unreachable objects are freed. Sweeping occurs
	// incrementally between GC cycles, so these two processes
	// occur simultaneously, and as a result HeapAlloc tends to
	// change smoothly (in contrast with the sawtooth that is
	// typical of stop-the-world garbage collectors).
	HeapAlloc uint64

// HeapSys is bytes of heap memory obtained from the OS.
	//
	// HeapSys measures the amount of virtual address space
	// reserved for the heap. This includes virtual address space
	// that has been reserved but not yet used, which consumes no
	// physical memory, but tends to be small, as well as virtual
	// address space for which the physical memory has been
	// returned to the OS after it became unused (see HeapReleased
	// for a measure of the latter).
	//
	// HeapSys estimates the largest size the heap has had.
	HeapSys uint64

// HeapIdle is bytes in idle (unused) spans.
	//
	// Idle spans have no objects in them. These spans could be
	// (and may already have been) returned to the OS, or they can
	// be reused for heap allocations, or they can be reused as
	// stack memory.
	//
	// HeapIdle minus HeapReleased estimates the amount of memory
	// that could be returned to the OS, but is being retained by
	// the runtime so it can grow the heap without requesting more
	// memory from the OS. If this difference is significantly
	// larger than the heap size, it indicates there was a recent
	// transient spike in live heap size.
	HeapIdle uint64

// HeapInuse is bytes in in-use spans.
	//
	// In-use spans have at least one object in them. These spans
	// can only be used for other objects of roughly the same
	// size.
	//
	// HeapInuse minus HeapAlloc estimates the amount of memory
	// that has been dedicated to particular size classes, but is
	// not currently being used. This is an upper bound on
	// fragmentation, but in general this memory can be reused
	// efficiently.
	HeapInuse uint64

// HeapReleased is bytes of physical memory returned to the OS.
	//
	// This counts heap memory from idle spans that was returned
	// to the OS and has not yet been reacquired for the heap.
	HeapReleased uint64

// HeapObjects is the number of allocated heap objects.
	//
	// Like HeapAlloc, this increases as objects are allocated and
	// decreases as the heap is swept and unreachable objects are
	// freed.
	HeapObjects uint64

// Stack memory statistics.
	//
	// Stacks are not considered part of the heap, but the runtime
	// can reuse a span of heap memory for stack memory, and
	// vice-versa.

// StackInuse is bytes in stack spans.
	//
	// In-use stack spans have at least one stack in them. These
	// spans can only be used for other stacks of the same size.
	//
	// There is no StackIdle because unused stack spans are
	// returned to the heap (and hence counted toward HeapIdle).
	StackInuse uint64

// StackSys is bytes of stack memory obtained from the OS.
	//
	// StackSys is StackInuse, plus any memory obtained directly
	// from the OS for OS thread stacks.
	//
	// In non-cgo programs this metric is currently equal to StackInuse
	// (but this should not be relied upon, and the value may change in
	// the future).
	//
	// In cgo programs this metric includes OS thread stacks allocated
	// directly from the OS. Currently, this only accounts for one stack in
	// c-shared and c-archive build modes and other sources of stacks from
	// the OS (notably, any allocated by C code) are not currently measured.
	// Note this too may change in the future.
	StackSys uint64

// Off-heap memory statistics.
	//
	// The following statistics measure runtime-internal
	// structures that are not allocated from heap memory (usually
	// because they are part of implementing the heap). Unlike
	// heap or stack memory, any memory allocated to these
	// structures is dedicated to these structures.
	//
	// These are primarily useful for debugging runtime memory
	// overheads.

// MSpanInuse is bytes of allocated mspan structures.
	MSpanInuse uint64

// MSpanSys is bytes of memory obtained from the OS for mspan
	// structures.
	MSpanSys uint64

// MCacheInuse is bytes of allocated mcache structures.
	MCacheInuse uint64

// MCacheSys is bytes of memory obtained from the OS for
	// mcache structures.
	MCacheSys uint64

// BuckHashSys is bytes of memory in profiling bucket hash tables.
	BuckHashSys uint64

// GCSys is bytes of memory in garbage collection metadata.
	GCSys uint64

// OtherSys is bytes of memory in miscellaneous off-heap
	// runtime allocations.
	OtherSys uint64

// Garbage collector statistics.

// NextGC is the target heap size of the next GC cycle.
	//
	// The garbage collector's goal is to keep HeapAlloc ≤ NextGC.
	// At the end of each GC cycle, the target for the next cycle
	// is computed based on the amount of reachable data and the
	// value of GOGC.
	NextGC uint64

// LastGC is the time the last garbage collection finished, as
	// nanoseconds since 1970 (the UNIX epoch).
	LastGC uint64

// PauseTotalNs is the cumulative nanoseconds in GC
	// stop-the-world pauses since the program started.
	//
	// During a stop-the-world pause, all goroutines are paused
	// and only the garbage collector can run.
	PauseTotalNs uint64

// PauseNs is a circular buffer of recent GC stop-the-world
	// pause times in nanoseconds.
	//
	// The most recent pause is at PauseNs[(NumGC+255)%256]. In
	// general, PauseNs[N%256] records the time paused in the most
	// recent N%256th GC cycle. There may be multiple pauses per
	// GC cycle; this is the sum of all pauses during a cycle.
	PauseNs [256]uint64

// PauseEnd is a circular buffer of recent GC pause end times,
	// as nanoseconds since 1970 (the UNIX epoch).
	//
	// This buffer is filled the same way as PauseNs. There may be
	// multiple pauses per GC cycle; this records the end of the
	// last pause in a cycle.
	PauseEnd [256]uint64

// NumGC is the number of completed GC cycles.
	NumGC uint32

// NumForcedGC is the number of GC cycles that were forced by
	// the application calling the GC function.
	NumForcedGC uint32

// GCCPUFraction is the fraction of this program's available
	// CPU time used by the GC since the program started.
	//
	// GCCPUFraction is expressed as a number between 0 and 1,
	// where 0 means GC has consumed none of this program's CPU. A
	// program's available CPU time is defined as the integral of
	// GOMAXPROCS since the program started. That is, if
	// GOMAXPROCS is 2 and a program has been running for 10
	// seconds, its "available CPU" is 20 seconds. GCCPUFraction
	// does not include CPU time used for write barrier activity.
	//
	// This is the same as the fraction of CPU reported by
	// GODEBUG=gctrace=1.
	GCCPUFraction float64

// EnableGC indicates that GC is enabled. It is always true,
	// even if GOGC=off.
	EnableGC bool

// DebugGC is currently unused.
	DebugGC bool

// BySize reports per-size class allocation statistics.
	//
	// BySize[N] gives statistics for allocations of size S where
	// BySize[N-1].Size < S ≤ BySize[N].Size.
	//
	// This does not report allocations larger than BySize[60].Size.
	BySize [61]struct {
		// Size is the maximum byte size of an object in this
		// size class.
		Size uint32

// Mallocs is the cumulative count of heap objects
		// allocated in this size class. The cumulative bytes
		// of allocation is Size*Mallocs. The number of live
		// objects in this size class is Mallocs - Frees.
		Mallocs uint64

// Frees is the cumulative count of heap objects freed
		// in this size class.
		Frees uint64
	}
}

func init() {
	if offset := unsafe.Offsetof(memstats.heapStats); offset%8 != 0 {
		println(offset)
		throw("memstats.heapStats not aligned to 8 bytes")
	}
	// Ensure the size of heapStatsDelta causes adjacent fields/slots (e.g.
	// [3]heapStatsDelta) to be 8-byte aligned.
	if size := unsafe.Sizeof(heapStatsDelta{}); size%8 != 0 {
		println(size)
		throw("heapStatsDelta not a multiple of 8 bytes in size")
	}
}

// ReadMemStats populates m with memory allocator statistics.
//
// The returned memory allocator statistics are up to date as of the
// call to ReadMemStats. This is in contrast with a heap profile,
// which is a snapshot as of the most recently completed garbage
// collection cycle.
func ReadMemStats(m *MemStats) {
	_ = m.Alloc // nil check test before we switch stacks, see issue 61158
	stw := stopTheWorld(stwReadMemStats)

systemstack(func() {
		readmemstats_m(m)
	})

startTheWorld(stw)
}

// doubleCheckReadMemStats controls a double-check mode for ReadMemStats that
// ensures consistency between the values that ReadMemStats is using and the
// runtime-internal stats.
var doubleCheckReadMemStats = false

// readmemstats_m populates stats for internal runtime values.
//
// The world must be stopped.
func readmemstats_m(stats *MemStats) {
	assertWorldStopped()

// Flush mcaches to mcentral before doing anything else.
	//
	// Flushing to the mcentral may in general cause stats to
	// change as mcentral data structures are manipulated.
	systemstack(flushallmcaches)

// Calculate memory allocator stats.
	// During program execution we only count number of frees and amount of freed memory.
	// Current number of alive objects in the heap and amount of alive heap memory
	// are calculated by scanning all spans.
	// Total number of mallocs is calculated as number of frees plus number of alive objects.
	// Similarly, total amount of allocated memory is calculated as amount of freed memory
	// plus amount of alive heap memory.

// Collect consistent stats, which are the source-of-truth in some cases.
	var consStats heapStatsDelta
	memstats.heapStats.unsafeRead(&consStats)

// Collect large allocation stats.
	totalAlloc := consStats.largeAlloc
	nMalloc := consStats.largeAllocCount
	totalFree := consStats.largeFree
	nFree := consStats.largeFreeCount

// Collect per-sizeclass stats.
	var bySize [_NumSizeClasses]struct {
		Size    uint32
		Mallocs uint64
		Frees   uint64
	}
	for i := range bySize {
		bySize[i].Size = uint32(class_to_size[i])

// Malloc stats.
		a := consStats.smallAllocCount[i]
		totalAlloc += a * uint64(class_to_size[i])
		nMalloc += a
		bySize[i].Mallocs = a

// Free stats.
		f := consStats.smallFreeCount[i]
		totalFree += f * uint64(class_to_size[i])
		nFree += f
		bySize[i].Frees = f
	}

// Account for tiny allocations.
	// For historical reasons, MemStats includes tiny allocations
	// in both the total free and total alloc count. This double-counts
	// memory in some sense because their tiny allocation block is also
	// counted. Tracking the lifetime of individual tiny allocations is
	// currently not done because it would be too expensive.
	nFree += consStats.tinyAllocCount
	nMalloc += consStats.tinyAllocCount

// Calculate derived stats.

stackInUse := uint64(consStats.inStacks)
	gcWorkBufInUse := uint64(consStats.inWorkBufs)
	gcProgPtrScalarBitsInUse := uint64(consStats.inPtrScalarBits)

totalMapped := gcController.heapInUse.load() + gcController.heapFree.load() + gcController.heapReleased.load() +
		memstats.stacks_sys.load() + memstats.mspan_sys.load() + memstats.mcache_sys.load() +
		memstats.buckhash_sys.load() + memstats.gcMiscSys.load() + memstats.other_sys.load() +
		stackInUse + gcWorkBufInUse + gcProgPtrScalarBitsInUse

heapGoal := gcController.heapGoal()

if doubleCheckReadMemStats {
		// Only check this if we're debugging. It would be bad to crash an application
		// just because the debugging stats are wrong. We mostly rely on tests to catch
		// these issues, and we enable the double check mode for tests.
		//
		// The world is stopped, so the consistent stats (after aggregation)
		// should be identical to some combination of memstats. In particular:
		//
		// * memstats.heapInUse == inHeap
		// * memstats.heapReleased == released
		// * memstats.heapInUse + memstats.heapFree == committed - inStacks - inWorkBufs - inPtrScalarBits
		// * memstats.totalAlloc == totalAlloc
		// * memstats.totalFree == totalFree
		//
		// Check if that's actually true.
		//
		// Prevent sysmon and the tracer from skewing the stats since they can
		// act without synchronizing with a STW. See #64401.
		lock(&sched.sysmonlock)
		lock(&trace.lock)
		if gcController.heapInUse.load() != uint64(consStats.inHeap) {
			print("runtime: heapInUse=", gcController.heapInUse.load(), "\n")
			print("runtime: consistent value=", consStats.inHeap, "\n")
			throw("heapInUse and consistent stats are not equal")
		}
		if gcController.heapReleased.load() != uint64(consStats.released) {
			print("runtime: heapReleased=", gcController.heapReleased.load(), "\n")
			print("runtime: consistent value=", consStats.released, "\n")
			throw("heapReleased and consistent stats are not equal")
		}
		heapRetained := gcController.heapInUse.load() + gcController.heapFree.load()
		consRetained := uint64(consStats.committed - consStats.inStacks - consStats.inWorkBufs - consStats.inPtrScalarBits)
		if heapRetained != consRetained {
			print("runtime: global value=", heapRetained, "\n")
			print("runtime: consistent value=", consRetained, "\n")
			throw("measures of the retained heap are not equal")
		}
		if gcController.totalAlloc.Load() != totalAlloc {
			print("runtime: totalAlloc=", gcController.totalAlloc.Load(), "\n")
			print("runtime: consistent value=", totalAlloc, "\n")
			throw("totalAlloc and consistent stats are not equal")
		}
		if gcController.totalFree.Load() != totalFree {
			print("runtime: totalFree=", gcController.totalFree.Load(), "\n")
			print("runtime: consistent value=", totalFree, "\n")
			throw("totalFree and consistent stats are not equal")
		}
		// Also check that mappedReady lines up with totalMapped - released.
		// This isn't really the same type of "make sure consistent stats line up" situation,
		// but this is an opportune time to check.
		if gcController.mappedReady.Load() != totalMapped-uint64(consStats.released) {
			print("runtime: mappedReady=", gcController.mappedReady.Load(), "\n")
			print("runtime: totalMapped=", totalMapped, "\n")
			print("runtime: released=", uint64(consStats.released), "\n")
			print("runtime: totalMapped-released=", totalMapped-uint64(consStats.released), "\n")
			throw("mappedReady and other memstats are not equal")
		}
		unlock(&trace.lock)
		unlock(&sched.sysmonlock)
	}

// We've calculated all the values we need. Now, populate stats.

stats.Alloc = totalAlloc - totalFree
	stats.TotalAlloc = totalAlloc
	stats.Sys = totalMapped
	stats.Mallocs = nMalloc
	stats.Frees = nFree
	stats.HeapAlloc = totalAlloc - totalFree
	stats.HeapSys = gcController.heapInUse.load() + gcController.heapFree.load() + gcController.heapReleased.load()
	// By definition, HeapIdle is memory that was mapped
	// for the heap but is not currently used to hold heap
	// objects. It also specifically is memory that can be
	// used for other purposes, like stacks, but this memory
	// is subtracted out of HeapSys before it makes that
	// transition. Put another way:
	//
	// HeapSys = bytes allocated from the OS for the heap - bytes ultimately used for non-heap purposes
	// HeapIdle = bytes allocated from the OS for the heap - bytes ultimately used for any purpose
	//
	// or
	//
	// HeapSys = sys - stacks_inuse - gcWorkBufInUse - gcProgPtrScalarBitsInUse
	// HeapIdle = sys - stacks_inuse - gcWorkBufInUse - gcProgPtrScalarBitsInUse - heapInUse
	//
	// => HeapIdle = HeapSys - heapInUse = heapFree + heapReleased
	stats.HeapIdle = gcController.heapFree.load() + gcController.heapReleased.load()
	stats.HeapInuse = gcController.heapInUse.load()
	stats.HeapReleased = gcController.heapReleased.load()
	stats.HeapObjects = nMalloc - nFree
	stats.StackInuse = stackInUse
	// memstats.stacks_sys is only memory mapped directly for OS stacks.
	// Add in heap-allocated stack memory for user consumption.
	stats.StackSys = stackInUse + memstats.stacks_sys.load()
	stats.MSpanInuse = uint64(mheap_.spanalloc.inuse)
	stats.MSpanSys = memstats.mspan_sys.load()
	stats.MCacheInuse = uint64(mheap_.cachealloc.inuse)
	stats.MCacheSys = memstats.mcache_sys.load()
	stats.BuckHashSys = memstats.buckhash_sys.load()
	// MemStats defines GCSys as an aggregate of all memory related
	// to the memory management system, but we track this memory
	// at a more granular level in the runtime.
	stats.GCSys = memstats.gcMiscSys.load() + gcWorkBufInUse + gcProgPtrScalarBitsInUse
	stats.OtherSys = memstats.other_sys.load()
	stats.NextGC = heapGoal
	stats.LastGC = memstats.last_gc_unix
	stats.PauseTotalNs = memstats.pause_total_ns
	stats.PauseNs = memstats.pause_ns
	stats.PauseEnd = memstats.pause_end
	stats.NumGC = memstats.numgc
	stats.NumForcedGC = memstats.numforcedgc
	stats.GCCPUFraction = memstats.gc_cpu_fraction
	stats.EnableGC = true

// stats.BySize and bySize might not match in length.
	// That's OK, stats.BySize cannot change due to backwards
	// compatibility issues. copy will copy the minimum amount
	// of values between the two of them.
	copy(stats.BySize[:], bySize[:])
}

//go:linkname readGCStats runtime/debug.readGCStats
func readGCStats(pauses *[]uint64) {
	systemstack(func() {
		readGCStats_m(pauses)
	})
}

// readGCStats_m must be called on the system stack because it acquires the heap
// lock. See mheap for details.
//
//go:systemstack
func readGCStats_m(pauses *[]uint64) {
	p := *pauses
	// Calling code in runtime/debug should make the slice large enough.
	if cap(p) < len(memstats.pause_ns)+3 {
		throw("short slice passed to readGCStats")
	}

// Pass back: pauses, pause ends, last gc (absolute time), number of gc, total pause ns.
	lock(&mheap_.lock)

n := memstats.numgc
	if n > uint32(len(memstats.pause_ns)) {
		n = uint32(len(memstats.pause_ns))
	}

// The pause buffer is circular. The most recent pause is at
	// pause_ns[(numgc-1)%len(pause_ns)], and then backward
	// from there to go back farther in time. We deliver the times
	// most recent first (in p[0]).
	p = p[:cap(p)]
	for i := uint32(0); i < n; i++ {
		j := (memstats.numgc - 1 - i) % uint32(len(memstats.pause_ns))
		p[i] = memstats.pause_ns[j]
		p[n+i] = memstats.pause_end[j]
	}

p[n+n] = memstats.last_gc_unix
	p[n+n+1] = uint64(memstats.numgc)
	p[n+n+2] = memstats.pause_total_ns
	unlock(&mheap_.lock)
	*pauses = p[:n+n+3]
}

// flushmcache flushes the mcache of allp[i].
//
// The world must be stopped.
//
//go:nowritebarrier
func flushmcache(i int) {
	assertWorldStopped()

p := allp[i]
	c := p.mcache
	if c == nil {
		return
	}
	c.releaseAll()
	stackcache_clear(c)
}

// flushallmcaches flushes the mcaches of all Ps.
//
// The world must be stopped.
//
//go:nowritebarrier
func flushallmcaches() {
	assertWorldStopped()

for i := 0; i < int(gomaxprocs); i++ {
		flushmcache(i)
	}
}

// sysMemStat represents a global system statistic that is managed atomically.
//
// This type must structurally be a uint64 so that mstats aligns with MemStats.
type sysMemStat uint64

// load atomically reads the value of the stat.
//
// Must be nosplit as it is called in runtime initialization, e.g. newosproc0.
//
//go:nosplit
func (s *sysMemStat) load() uint64 {
	return atomic.Load64((*uint64)(s))
}

// add atomically adds the sysMemStat by n.
//
// Must be nosplit as it is called in runtime initialization, e.g. newosproc0.
//
//go:nosplit
func (s *sysMemStat) add(n int64) {
	val := atomic.Xadd64((*uint64)(s), n)
	if (n > 0 && int64(val) < n) || (n < 0 && int64(val)+n < n) {
		print("runtime: val=", val, " n=", n, "\n")
		throw("sysMemStat overflow")
	}
}

// heapStatsDelta contains deltas of various runtime memory statistics
// that need to be updated together in order for them to be kept
// consistent with one another.
type heapStatsDelta struct {
	// Memory stats.
	committed       int64 // byte delta of memory committed
	released        int64 // byte delta of released memory generated
	inHeap          int64 // byte delta of memory placed in the heap
	inStacks        int64 // byte delta of memory reserved for stacks
	inWorkBufs      int64 // byte delta of memory reserved for work bufs
	inPtrScalarBits int64 // byte delta of memory reserved for unrolled GC prog bits

// Allocator stats.
	//
	// These are all uint64 because they're cumulative, and could quickly wrap
	// around otherwise.
	tinyAllocCount  uint64                  // number of tiny allocations
	largeAlloc      uint64                  // bytes allocated for large objects
	largeAllocCount uint64                  // number of large object allocations
	smallAllocCount [_NumSizeClasses]uint64 // number of allocs for small objects
	largeFree       uint64                  // bytes freed for large objects (>maxSmallSize)
	largeFreeCount  uint64                  // number of frees for large objects (>maxSmallSize)
	smallFreeCount  [_NumSizeClasses]uint64 // number of frees for small objects (<=maxSmallSize)

// NOTE: This struct must be a multiple of 8 bytes in size because it
	// is stored in an array. If it's not, atomic accesses to the above
	// fields may be unaligned and fail on 32-bit platforms.
}

// merge adds in the deltas from b into a.
func (a *heapStatsDelta) merge(b *heapStatsDelta) {
	a.committed += b.committed
	a.released += b.released
	a.inHeap += b.inHeap
	a.inStacks += b.inStacks
	a.inWorkBufs += b.inWorkBufs
	a.inPtrScalarBits += b.inPtrScalarBits

a.tinyAllocCount += b.tinyAllocCount
	a.largeAlloc += b.largeAlloc
	a.largeAllocCount += b.largeAllocCount
	for i := range b.smallAllocCount {
		a.smallAllocCount[i] += b.smallAllocCount[i]
	}
	a.largeFree += b.largeFree
	a.largeFreeCount += b.largeFreeCount
	for i := range b.smallFreeCount {
		a.smallFreeCount[i] += b.smallFreeCount[i]
	}
}

// consistentHeapStats represents a set of various memory statistics
// whose updates must be viewed completely to get a consistent
// state of the world.
//
// To write updates to memory stats use the acquire and release
// methods. To obtain a consistent global snapshot of these statistics,
// use read.
type consistentHeapStats struct {
	// stats is a ring buffer of heapStatsDelta values.
	// Writers always atomically update the delta at index gen.
	//
	// Readers operate by rotating gen (0 -> 1 -> 2 -> 0 -> ...)
	// and synchronizing with writers by observing each P's
	// statsSeq field. If the reader observes a P not writing,
	// it can be sure that it will pick up the new gen value the
	// next time it writes.
	//
	// The reader then takes responsibility by clearing space
	// in the ring buffer for the next reader to rotate gen to
	// that space (i.e. it merges in values from index (gen-2) mod 3
	// to index (gen-1) mod 3, then clears the former).
	//
	// Note that this means only one reader can be reading at a time.
	// There is no way for readers to synchronize.
	//
	// This process is why we need a ring buffer of size 3 instead
	// of 2: one is for the writers, one contains the most recent
	// data, and the last one is clear so writers can begin writing
	// to it the moment gen is updated.
	stats [3]heapStatsDelta

// gen represents the current index into which writers
	// are writing, and can take on the value of 0, 1, or 2.
	gen atomic.Uint32

// noPLock is intended to provide mutual exclusion for updating
	// stats when no P is available. It does not block other writers
	// with a P, only other writers without a P and the reader. Because
	// stats are usually updated when a P is available, contention on
	// this lock should be minimal.
	noPLock mutex
}

// acquire returns a heapStatsDelta to be updated. In effect,
// it acquires the shard for writing. release must be called
// as soon as the relevant deltas are updated.
//
// The returned heapStatsDelta must be updated atomically.
//
// The caller's P must not change between acquire and
// release. This also means that the caller should not
// acquire a P or release its P in between. A P also must
// not acquire a given consistentHeapStats if it hasn't
// yet released it.
//
// nosplit because a stack growth in this function could
// lead to a stack allocation that could reenter the
// function.
//
//go:nosplit
func (m *consistentHeapStats) acquire() *heapStatsDelta {
	if pp := getg().m.p.ptr(); pp != nil {
		seq := pp.statsSeq.Add(1)
		if seq%2 == 0 {
			// Should have been incremented to odd.
			print("runtime: seq=", seq, "\n")
			throw("bad sequence number")
		}
	} else {
		lock(&m.noPLock)
	}
	gen := m.gen.Load() % 3
	return &m.stats[gen]
}

// release indicates that the writer is done modifying
// the delta. The value returned by the corresponding
// acquire must no longer be accessed or modified after
// release is called.
//
// The caller's P must not change between acquire and
// release. This also means that the caller should not
// acquire a P or release its P in between.
//
// nosplit because a stack growth in this function could
// lead to a stack allocation that causes another acquire
// before this operation has completed.
//
//go:nosplit
func (m *consistentHeapStats) release() {
	if pp := getg().m.p.ptr(); pp != nil {
		seq := pp.statsSeq.Add(1)
		if seq%2 != 0 {
			// Should have been incremented to even.
			print("runtime: seq=", seq, "\n")
			throw("bad sequence number")
		}
	} else {
		unlock(&m.noPLock)
	}
}

// unsafeRead aggregates the delta for this shard into out.
//
// Unsafe because it does so without any synchronization. The
// world must be stopped.
func (m *consistentHeapStats) unsafeRead(out *heapStatsDelta) {
	assertWorldStopped()

for i := range m.stats {
		out.merge(&m.stats[i])
	}
}

// unsafeClear clears the shard.
//
// Unsafe because the world must be stopped and values should
// be donated elsewhere before clearing.
func (m *consistentHeapStats) unsafeClear() {
	assertWorldStopped()

for i := range m.stats {
		m.stats[i] = heapStatsDelta{}
	}
}

// read takes a globally consistent snapshot of m
// and puts the aggregated value in out. Even though out is a
// heapStatsDelta, the resulting values should be complete and
// valid statistic values.
//
// Not safe to call concurrently. The world must be stopped
// or metricsSema must be held.
func (m *consistentHeapStats) read(out *heapStatsDelta) {
	// Getting preempted after this point is not safe because
	// we read allp. We need to make sure a STW can't happen
	// so it doesn't change out from under us.
	mp := acquirem()

// Get the current generation. We can be confident that this
	// will not change since read is serialized and is the only
	// one that modifies currGen.
	currGen := m.gen.Load()
	prevGen := currGen - 1
	if currGen == 0 {
		prevGen = 2
	}

// Prevent writers without a P from writing while we update gen.
	lock(&m.noPLock)

// Rotate gen, effectively taking a snapshot of the state of
	// these statistics at the point of the exchange by moving
	// writers to the next set of deltas.
	//
	// This exchange is safe to do because we won't race
	// with anyone else trying to update this value.
	m.gen.Swap((currGen + 1) % 3)

// Allow P-less writers to continue. They'll be writing to the
	// next generation now.
	unlock(&m.noPLock)

for _, p := range allp {
		// Spin until there are no more writers.
		for p.statsSeq.Load()%2 != 0 {
		}
	}

// At this point we've observed that each sequence
	// number is even, so any future writers will observe
	// the new gen value. That means it's safe to read from
	// the other deltas in the stats buffer.

// Perform our responsibilities and free up
	// stats[prevGen] for the next time we want to take
	// a snapshot.
	m.stats[currGen].merge(&m.stats[prevGen])
	m.stats[prevGen] = heapStatsDelta{}

// Finally, copy out the complete delta.
	*out = m.stats[currGen]

releasem(mp)
}

type cpuStats struct {
	// All fields are CPU time in nanoseconds computed by comparing
	// calls of nanotime. This means they're all overestimates, because
	// they don't accurately compute on-CPU time (so some of the time
	// could be spent scheduled away by the OS).

gcAssistTime    int64 // GC assists
	gcDedicatedTime int64 // GC dedicated mark workers + pauses
	gcIdleTime      int64 // GC idle mark workers
	gcPauseTime     int64 // GC pauses (all GOMAXPROCS, even if just 1 is running)
	gcTotalTime     int64

scavengeAssistTime int64 // background scavenger
	scavengeBgTime     int64 // scavenge assists
	scavengeTotalTime  int64

idleTime int64 // Time Ps spent in _Pidle.
	userTime int64 // Time Ps spent in _Prunning or _Psyscall that's not any of the above.

totalTime int64 // GOMAXPROCS * (monotonic wall clock time elapsed)
}

// accumulate takes a cpuStats and adds in the current state of all GC CPU
// counters.
//
// gcMarkPhase indicates that we're in the mark phase and that certain counter
// values should be used.
func (s *cpuStats) accumulate(now int64, gcMarkPhase bool) {
	// N.B. Mark termination and sweep termination pauses are
	// accumulated in work.cpuStats at the end of their respective pauses.
	var (
		markAssistCpu     int64
		markDedicatedCpu  int64
		markFractionalCpu int64
		markIdleCpu       int64
	)
	if gcMarkPhase {
		// N.B. These stats may have stale values if the GC is not
		// currently in the mark phase.
		markAssistCpu = gcController.assistTime.Load()
		markDedicatedCpu = gcController.dedicatedMarkTime.Load()
		markFractionalCpu = gcController.fractionalMarkTime.Load()
		markIdleCpu = gcController.idleMarkTime.Load()
	}

// The rest of the stats below are either derived from the above or
	// are reset on each mark termination.

scavAssistCpu := scavenge.assistTime.Load()
	scavBgCpu := scavenge.backgroundTime.Load()

// Update cumulative GC CPU stats.
	s.gcAssistTime += markAssistCpu
	s.gcDedicatedTime += markDedicatedCpu + markFractionalCpu
	s.gcIdleTime += markIdleCpu
	s.gcTotalTime += markAssistCpu + markDedicatedCpu + markFractionalCpu + markIdleCpu

// Update cumulative scavenge CPU stats.
	s.scavengeAssistTime += scavAssistCpu
	s.scavengeBgTime += scavBgCpu
	s.scavengeTotalTime += scavAssistCpu + scavBgCpu

// Update total CPU.
	s.totalTime = sched.totaltime + (now-sched.procresizetime)*int64(gomaxprocs)
	s.idleTime += sched.idleTime.Load()

// Compute userTime. We compute this indirectly as everything that's not the above.
	//
	// Since time spent in _Pgcstop is covered by gcPauseTime, and time spent in _Pidle
	// is covered by idleTime, what we're left with is time spent in _Prunning and _Psyscall,
	// the latter of which is fine because the P will either go idle or get used for something
	// else via sysmon. Meanwhile if we subtract GC time from whatever's left, we get non-GC
	// _Prunning time. Note that this still leaves time spent in sweeping and in the scheduler,
	// but that's fine. The overwhelming majority of this time will be actual user time.
	s.userTime = s.totalTime - (s.gcTotalTime + s.scavengeTotalTime + s.idleTime)
}

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