https://github.com/torvalds/linux
Revision d4794f25f122aa1a8a073be51112edaa723ffff4 authored by Yazen Ghannam on 25 March 2019, 17:32:42 UTC, committed by Len Brown on 31 August 2019, 18:48:34 UTC
Turbostat currently normalizes TSC and other values by dividing by an interval. This interval is the delta between the start of one global (all counters on all CPUs) sampling and the start of another. However, this introduces a lot of jitter into the data. In order to reduce jitter, the interval calculation should be based on timestamps taken per thread and close to the start of the thread's sampling. Define a per thread time value to hold the delta between samples taken on the thread. Use the timestamp taken at the beginning of sampling to calculate the delta. Move the thread's beginning timestamp to after the CPU migration to avoid jitter due to the migration. Use the global time delta for the average time delta. Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com> Signed-off-by: Len Brown <len.brown@intel.com>
1 parent d743dae
Tip revision: d4794f25f122aa1a8a073be51112edaa723ffff4 authored by Yazen Ghannam on 25 March 2019, 17:32:42 UTC
tools/power turbostat: Make interval calculation per thread to reduce jitter
tools/power turbostat: Make interval calculation per thread to reduce jitter
Tip revision: d4794f2
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| atomic | ||
| basic | ||
| coccinelle | ||
| dtc | ||
| gcc-plugins | ||
| gdb | ||
| genksyms | ||
| kconfig | ||
| ksymoops | ||
| mod | ||
| package | ||
| selinux | ||
| tracing | ||
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| Kbuild.include | -rw-r--r-- | 12.2 KB |
| Kconfig.include | -rw-r--r-- | 1.2 KB |
| Lindent | -rwxr-xr-x | 502 bytes |
| Makefile | -rw-r--r-- | 1.4 KB |
| Makefile.asm-generic | -rw-r--r-- | 1.8 KB |
| Makefile.build | -rw-r--r-- | 17.3 KB |
| Makefile.clean | -rw-r--r-- | 2.8 KB |
| Makefile.dtbinst | -rw-r--r-- | 1.1 KB |
| Makefile.extrawarn | -rw-r--r-- | 2.4 KB |
| Makefile.gcc-plugins | -rw-r--r-- | 2.4 KB |
| Makefile.headersinst | -rw-r--r-- | 3.2 KB |
| Makefile.host | -rw-r--r-- | 6.3 KB |
| Makefile.kasan | -rw-r--r-- | 1.4 KB |
| Makefile.kcov | -rw-r--r-- | 359 bytes |
| Makefile.lib | -rw-r--r-- | 15.2 KB |
| Makefile.modbuiltin | -rw-r--r-- | 1.7 KB |
| Makefile.modinst | -rw-r--r-- | 1.1 KB |
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| Makefile.modsign | -rw-r--r-- | 791 bytes |
| Makefile.ubsan | -rw-r--r-- | 864 bytes |
| adjust_autoksyms.sh | -rwxr-xr-x | 2.6 KB |
| asn1_compiler.c | -rw-r--r-- | 35.3 KB |
| bin2c.c | -rw-r--r-- | 743 bytes |
| bloat-o-meter | -rwxr-xr-x | 3.3 KB |
| bootgraph.pl | -rwxr-xr-x | 5.6 KB |
| bpf_helpers_doc.py | -rwxr-xr-x | 15.5 KB |
| cc-can-link.sh | -rwxr-xr-x | 166 bytes |
| check_extable.sh | -rwxr-xr-x | 4.9 KB |
| checkincludes.pl | -rwxr-xr-x | 1.9 KB |
| checkkconfigsymbols.py | -rwxr-xr-x | 15.5 KB |
| checkpatch.pl | -rwxr-xr-x | 198.0 KB |
| checkstack.pl | -rwxr-xr-x | 5.3 KB |
| checksyscalls.sh | -rwxr-xr-x | 7.3 KB |
| checkversion.pl | -rwxr-xr-x | 1.9 KB |
| clang-version.sh | -rwxr-xr-x | 527 bytes |
| cleanfile | -rwxr-xr-x | 3.5 KB |
| cleanpatch | -rwxr-xr-x | 5.1 KB |
| coccicheck | -rwxr-xr-x | 7.2 KB |
| config | -rwxr-xr-x | 4.5 KB |
| conmakehash.c | -rw-r--r-- | 5.8 KB |
| const_structs.checkpatch | -rw-r--r-- | 964 bytes |
| decode_stacktrace.sh | -rwxr-xr-x | 3.9 KB |
| decodecode | -rwxr-xr-x | 2.6 KB |
| depmod.sh | -rwxr-xr-x | 1.3 KB |
| diffconfig | -rwxr-xr-x | 3.7 KB |
| documentation-file-ref-check | -rwxr-xr-x | 5.4 KB |
| export_report.pl | -rwxr-xr-x | 4.5 KB |
| extract-cert.c | -rw-r--r-- | 3.5 KB |
| extract-ikconfig | -rwxr-xr-x | 1.7 KB |
| extract-module-sig.pl | -rwxr-xr-x | 3.7 KB |
| extract-sys-certs.pl | -rwxr-xr-x | 3.7 KB |
| extract-vmlinux | -rwxr-xr-x | 1.7 KB |
| extract_xc3028.pl | -rwxr-xr-x | 44.6 KB |
| faddr2line | -rwxr-xr-x | 6.2 KB |
| file-size.sh | -rwxr-xr-x | 86 bytes |
| find-unused-docs.sh | -rwxr-xr-x | 1.3 KB |
| gcc-goto.sh | -rwxr-xr-x | 511 bytes |
| gcc-ld | -rwxr-xr-x | 711 bytes |
| gcc-plugin.sh | -rwxr-xr-x | 1.1 KB |
| gcc-version.sh | -rwxr-xr-x | 588 bytes |
| gcc-x86_32-has-stack-protector.sh | -rwxr-xr-x | 173 bytes |
| gcc-x86_64-has-stack-protector.sh | -rwxr-xr-x | 198 bytes |
| gen_compile_commands.py | -rwxr-xr-x | 5.6 KB |
| gen_ksymdeps.sh | -rwxr-xr-x | 399 bytes |
| get_abi.pl | -rwxr-xr-x | 10.1 KB |
| get_dvb_firmware | -rwxr-xr-x | 24.5 KB |
| get_maintainer.pl | -rwxr-xr-x | 66.0 KB |
| gfp-translate | -rwxr-xr-x | 1.7 KB |
| headerdep.pl | -rwxr-xr-x | 3.5 KB |
| headers_check.pl | -rwxr-xr-x | 3.7 KB |
| headers_install.sh | -rwxr-xr-x | 1.4 KB |
| insert-sys-cert.c | -rw-r--r-- | 8.9 KB |
| kallsyms.c | -rw-r--r-- | 18.0 KB |
| kernel-doc | -rwxr-xr-x | 60.7 KB |
| ld-version.sh | -rwxr-xr-x | 269 bytes |
| leaking_addresses.pl | -rwxr-xr-x | 12.8 KB |
| link-vmlinux.sh | -rwxr-xr-x | 6.8 KB |
| makelst | -rwxr-xr-x | 808 bytes |
| markup_oops.pl | -rwxr-xr-x | 7.9 KB |
| mkcompile_h | -rwxr-xr-x | 2.5 KB |
| mkmakefile | -rwxr-xr-x | 450 bytes |
| mksysmap | -rwxr-xr-x | 1.3 KB |
| mkuboot.sh | -rwxr-xr-x | 414 bytes |
| module-common.lds | -rw-r--r-- | 901 bytes |
| modules-check.sh | -rwxr-xr-x | 303 bytes |
| namespace.pl | -rwxr-xr-x | 13.0 KB |
| objdiff | -rwxr-xr-x | 2.8 KB |
| parse-maintainers.pl | -rw-r--r-- | 3.7 KB |
| patch-kernel | -rwxr-xr-x | 9.9 KB |
| pnmtologo.c | -rw-r--r-- | 11.9 KB |
| profile2linkerlist.pl | -rwxr-xr-x | 414 bytes |
| prune-kernel | -rwxr-xr-x | 708 bytes |
| recordmcount.c | -rw-r--r-- | 16.6 KB |
| recordmcount.h | -rw-r--r-- | 16.4 KB |
| recordmcount.pl | -rwxr-xr-x | 18.8 KB |
| setlocalversion | -rwxr-xr-x | 4.3 KB |
| show_delta | -rwxr-xr-x | 3.0 KB |
| sign-file.c | -rw-r--r-- | 9.8 KB |
| sortextable.c | -rw-r--r-- | 8.3 KB |
| sortextable.h | -rw-r--r-- | 5.5 KB |
| spdxcheck-test.sh | -rw-r--r-- | 323 bytes |
| spdxcheck.py | -rwxr-xr-x | 9.9 KB |
| spelling.txt | -rw-r--r-- | 28.8 KB |
| sphinx-pre-install | -rwxr-xr-x | 17.6 KB |
| split-man.pl | -rwxr-xr-x | 600 bytes |
| stackdelta | -rwxr-xr-x | 1.8 KB |
| stackusage | -rwxr-xr-x | 794 bytes |
| subarch.include | -rw-r--r-- | 641 bytes |
| tags.sh | -rwxr-xr-x | 9.3 KB |
| unifdef.c | -rw-r--r-- | 34.8 KB |
| ver_linux | -rwxr-xr-x | 2.7 KB |
| xen-hypercalls.sh | -rw-r--r-- | 386 bytes |
| xz_wrap.sh | -rwxr-xr-x | 562 bytes |
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