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5f148e7c6a
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Kan Liang 5f148e7c6a perf stat: Add Topdown metrics L2 events as default events 
The Topdown Microarchitecture Analysis (TMA) Method is a structured
analysis methodology to identify critical performance bottlenecks in
out-of-order processors.

The Topdown metrics L1 event was added as default in 42641d6f4d
("perf stat: Add Topdown metrics events as default events")

From the Sapphire Rapids server and later platforms, the same dedicated
"metrics" register is extended to support both L1 and L2 events.

Add both L1 and L2 Topdown metrics events as default to enrich the
default measuring information if the new measurement register is
available.

On legacy systems there is no change to avoid extra multiplexing.

The topdown_level indicates the max metrics level for the top-down
statistics. Set it to 2 to display all L1 and L2 Topdown metrics events.

With the patch:

  $ perf stat sleep 1

  Performance counter stats for 'sleep 1':

           0.59 msec task-clock             #   0.001 CPUs utilized
              1      context-switches       #   1.687 K/sec
              0      cpu-migrations         #   0.000 /sec
             76      page-faults            # 128.198 K/sec
      1,405,318      cycles                 #   2.371 GHz
      1,471,136      instructions           #   1.05  insn per cycle
        310,132      branches               # 523.136 M/sec
         10,435      branch-misses          #   3.36% of all branches
      8,431,908      slots                  #  14.223 G/sec
      1,554,116      topdown-retiring       #    18.4% retiring
      1,289,585      topdown-bad-spec       #    15.2% bad speculation
      2,810,636      topdown-fe-bound       #    33.2% frontend bound
      2,810,636      topdown-be-bound       #    33.2% backend bound
        231,464      topdown-heavy-ops      #     2.7% heavy operations   #  15.6% light operations
      1,223,453      topdown-br-mispredict  #    14.5% branch mispredict  #   0.8% machine clears
      1,884,779      topdown-fetch-lat      #    22.3% fetch latency      #  10.9% fetch bandwidth
      1,454,917      topdown-mem-bound      #    17.2% memory bound       #  16.0% Core bound

    1.001179699 seconds time elapsed

    0.000000000 seconds user
    0.001238000 seconds sys

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/1625760169-18396-1-git-send-email-kan.liang@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2021-07-09 14:04:32 -03:00
arch memblock, arm: fix crashes caused by holes in the memory map 2021-07-04 12:23:05 -07:00
block scsi: blkcg: Fix application ID config options 2021-07-04 11:44:22 -07:00
certs Kbuild updates for v5.13 (2nd) 2021-05-08 10:00:11 -07:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2021-06-28 16:04:56 -07:00
Documentation Merge branch 'core-rcu-2021.07.04' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu 2021-07-04 12:58:33 -07:00
drivers s390 updates for the 5.14 merge window 2021-07-04 12:17:38 -07:00
fs Merge branch 'work.namei' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2021-07-03 11:41:14 -07:00
include Merge branch 'core-rcu-2021.07.04' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu 2021-07-04 12:58:33 -07:00
init Merge branch 'core-rcu-2021.07.04' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu 2021-07-04 12:58:33 -07:00
ipc Merge branch 'akpm' (patches from Andrew) 2021-07-02 12:08:10 -07:00
kernel Merge branch 'core-rcu-2021.07.04' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu 2021-07-04 12:58:33 -07:00
lib iov_iter: remove uaccess_kernel() warning from iov_iter_init() 2021-07-04 16:12:42 -07:00
LICENSES LICENSES: Add the CC-BY-4.0 license 2020-12-08 10:33:27 -07:00
mm Merge branch 'core-rcu-2021.07.04' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu 2021-07-04 12:58:33 -07:00
net asm-generic/unaligned: Unify asm/unaligned.h around struct helper 2021-07-02 12:43:40 -07:00
samples VFIO update for v5.14-rc1 2021-07-03 11:49:33 -07:00
scripts s390 updates for the 5.14 merge window 2021-07-04 12:17:38 -07:00
security asm-generic/unaligned: Unify asm/unaligned.h around struct helper 2021-07-02 12:43:40 -07:00
sound Revert "ALSA: usb-audio: Reduce latency at playback start" 2021-07-02 22:05:52 -07:00
tools perf stat: Add Topdown metrics L2 events as default events 2021-07-09 14:04:32 -03:00
usr .gitignore: prefix local generated files with a slash 2021-05-02 00:43:35 +09:00
virt Merge branch 'akpm' (patches from Andrew) 2021-06-29 17:29:11 -07:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap m68k updates for v5.14 2021-06-28 14:01:03 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: move Murali Karicheri to credits 2021-04-29 15:47:30 -07:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Merge branch 'i2c/for-mergewindow' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2021-07-04 11:47:18 -07:00
Makefile arm64 updates for 5.14 2021-06-28 14:04:24 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.