Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# powermetrics
+
+`powermetrics` is a Mac-only command-line utility that provides many
+high-quality power-related measurements. It is most useful for getting
+CPU, GPU and wakeup measurements in a precise and easily scriptable
+fashion (unlike [Activity Monitor and
+top](activity_monitor_and_top.md))
+especially in combination with
+[rapl](tools_power_rapl.md) via the
+`mach power` command. This document describes the version of
+`powermetrics` that comes with Mac OS 10.10. The one that comes with
+10.9 is less powerful.
+
+**Note**: The [power profiling
+overview](power_profiling_overview.md) is
+worth reading at this point if you haven\'t already. It may make parts
+of this document easier to understand.
+
+## Quick start
+
+`powermetrics` provides a vast number of measurements. The following
+command encompasses the most useful ones:
+
+sudo powermetrics --samplers tasks --show-process-coalition --show-process-gpu -n 1 -i 5000
+
+-   `--samplers tasks` tells it to just do per-process measurements.
+-   `--show-process-coalition`` `tells it to group *coalitions* of
+    related processes, e.g. the Firefox parent process and child
+    processes.
+-   `--show-process-gpu` tells it to show per-process GPU measurements.
+-   `-n 1` tells it to take one sample and then stop.
+-   `-i 5000` tells it to use a sample length of 5 seconds (5000 ms).
+    Change this number to get shorter or longer samples.
+
+The following is example output from such an invocation:
+
+    *** Sampled system activity (Fri Sep  4 17:15:14 2015 +1000) (5009.63ms elapsed) ***
+
+    *** Running tasks ***
+
+    Name                               ID     CPU ms/s  User%  Deadlines (<2 ms, 2-5 ms)  Wakeups (Intr, Pkg idle)  GPU ms/s
+    com.apple.Terminal                 293    447.66                                      274.83  120.35            221.74
+      firefox                          84627  77.59     55.55  15.37   2.59               91.42   42.12             204.47
+      plugin-container                 84628  377.22    37.18  43.91   18.56              178.65  75.85             17.29
+      Terminal                         694    9.86      79.94  0.00    0.00               4.39    2.20              0.00
+      powermetrics                     84694  1.21      31.53  0.00    0.00               0.20    0.20              0.00
+    com.google.Chrome                  489    233.83                                      48.10   25.95             0.00
+      Google Chrome Helper             84688  181.57    92.81  0.00    0.00               23.95   12.77             0.00
+      Google Chrome                    84681  57.26     76.07  4.39    0.00               23.75   12.97             0.00
+      Google Chrome Helper             84685  0.13      48.08  0.00    0.00               0.40    0.20              0.00
+    kernel_coalition                   1      128.64                                      780.19  330.52            0.00
+      kernel_task                      0      109.97    0.00   0.20    0.00               779.47  330.35            0.00
+      launchd                          1      18.88     2.44   0.00    0.00               0.40    0.20              0.00
+    com.apple.Safari                   488    90.60                                       108.58  56.48             26.65
+      com.apple.WebKit.WebContent      84679  64.21     84.69  0.00    0.00               104.19  54.89             26.66
+      com.apple.WebKit.Networking      84678  26.89     58.89  0.40    0.00               1.60    0.00              0.00
+      Safari                           84676  1.56      55.74  0.00    0.00               2.59    1.40              0.00
+      com.apple.Safari.SearchHelper    84690  0.15      49.49  0.00    0.00               0.20    0.20              0.00
+    org.mozilla.firefox                482    76.56                                       124.34  63.47             0.00
+      firefox                          84496  76.70     89.18  10.58   5.59               124.55  63.48             0.00
+
+This sample was taken while the following programs were running:
+
+-   Firefox Beta (single process, invoked from the Mac OS dock, shown in
+    the `org.mozilla.firefox` coalition.)
+-   Firefox Nightly (multi-process, invoked from the command line, shown
+    in the `com.apple.Terminal` coalition.)
+-   Google Chrome.
+-   Safari.
+
+The grouping of parent and child processes (in coalitions) is obvious.
+The meaning of the columns is as follows.
+
+-   **Name**: Coalition/process name. Process names within coalitions
+    are indented.
+-   **ID**: Coalition/process ID number.
+-   **CPU ms/s**: CPU time used by the coalition/process, per second,
+    during the sample period. The sum of the process values typically
+    exceeds the coalition value slightly, for unknown reasons.
+-   **User%**: Percentage of that CPU time spent in user space (as
+    opposed to kernel mode.)
+-   **Deadlines (\<2 ms, 2-5 ms)**: These two columns count how many
+    \"short\" timers woke up threads in the process, per second, during
+    the sample period. High frequency timers, which typically have short
+    time-to-deadlines, can cause high power consumption and should be
+    avoided if possible.
+-   **Wakeups (Intr, Pkg idle)**: These two columns count how many
+    wakeups occurred, per second, during the sample period. The first
+    column counts interrupt-level wakeups that resulted in a thread
+    being dispatched in the process. The second column counts \"package
+    idle exit\" wakeups, which wake up the entire package as opposed to
+    just a single core; such wakeups are particularly expensive, and
+    this count is a subset of the first column\'s count.
+-   **GPU ms/s**: GPU time used by the coalition/process, per second,
+    during the sample period.
+
+Other things to note.
+
+-   Smaller is better --- i.e. results in lower power consumption ---
+    for all of these measurements.
+-   There is some overlap between the two \"Deadlines\" columns and the
+    two \"Wakeups\" columns. For example, firing a single sub-2ms
+    deadline can also cause a package idle exit wakeup.
+-   Many of these measurements are also obtainable by passing the
+    `TASK_POWER_INFO` flag and a `task_power_info` struct to the
+    `task_info` function.
+-   By default, the coalitions/processes are sorted by a composite value
+    computed from several factors, though this can be changed via
+    command-line options.
+
+## Other measurements
+
+`powermetrics` can also report measurements of backlight usage, network
+activity, disk activity, interrupt distribution, device power states,
+C-state residency, P-state residency, quality of service classes, and
+thermal pressure. These are less likely to be useful for profiling
+Firefox, however. Run with the `--show-all` to see all of these at once,
+but note that you\'ll need a very wide window to see all the data.
+
+Also note that `powermetrics -h` is a better guide to the the
+command-line options than `man powermetrics`.
+
+## mach power
+
+You can use the `mach power` command to run `powermetrics` in
+combination with `rapl` in a way that gives the most useful summary
+measurements for each of Firefox, Chrome and Safari. The following is
+sample output.
+
+        total W = _pkg_ (cores + _gpu_ + other) + _ram_ W
+    #01 17.14 W = 14.98 ( 5.50 +  1.19 +  8.29) +  2.16 W
+
+    1 sample taken over a period of 30.000 seconds
+
+    Name                               ID     CPU ms/s  User%  Deadlines (<2 ms, 2-5 ms)  Wakeups (Intr, Pkg idle)  GPU ms/s
+    com.google.Chrome                  500    439.64                                      585.35  218.62            19.17
+      Google Chrome Helper             67319  284.75    83.03  296.67  0.00               454.05  172.74            0.00
+      Google Chrome Helper             67304  55.23     64.83  0.03    0.00               9.43    4.33              19.17
+      Google Chrome                    67301  63.77     68.09  29.46   0.13               76.11   22.26             0.00
+      Google Chrome Helper             67320  38.30     66.70  17.83   0.00               45.78   19.29             0.00
+    com.apple.WindowServer             68     102.58                                      112.36  43.15             80.52
+      WindowServer                     141    103.03    58.19  60.48   6.40               112.36  43.15             80.53
+    com.apple.Safari                   499    267.19                                      110.53  46.05             1.69
+      com.apple.WebKit.WebContent      67372  190.15    79.34  2.02    0.14               129.28  53.79             2.33
+      com.apple.WebKit.Networking      67292  65.23     52.74  0.07    0.00               4.33    1.40              0.00
+      Safari                           67290  29.09     77.65  0.23    0.00               7.13    3.37              0.00
+      com.apple.Safari.SearchHelper    67371  13.88     91.18  0.00    0.00               0.36    0.05              0.00
+      com.apple.WebKit.WebContent      67297  0.81      56.84  0.10    0.00               2.20    1.30              0.00
+      com.apple.WebKit.WebContent      67293  0.46      76.40  0.03    0.00               0.57    0.20              0.00
+      com.apple.WebKit.WebContent      67295  0.24      67.72  0.00    0.00               0.90    0.37              0.00
+      com.apple.WebKit.WebContent      67298  0.17      59.88  0.00    0.00               0.50    0.13              0.00
+      com.apple.WebKit.WebContent      67296  0.07      43.51  0.00    0.00               0.10    0.03              0.00
+    kernel_coalition                   1      111.76                                      724.80  213.09            0.12
+      kernel_task                      0      107.06    0.00   5.86    0.00               724.46  212.99            0.12
+    org.mozilla.firefox                498    92.17                                       212.69  75.67             1.81
+      firefox                          63865  61.00     87.18  1.00    0.87               25.79   9.00              1.81
+      plugin-container                 67269  31.49     72.46  1.80    0.00               186.90  66.68             0.00
+      com.apple.WebKit.Plugin.64       67373  55.55     74.38  0.74    0.00               9.51    3.13              0.02
+    com.apple.Terminal                 109    6.22                                        0.40    0.23              0.00
+      Terminal                         208    6.25      92.99  0.00    0.00               0.33    0.20              0.00
+
+The `rapl` output is first, then the `powermetrics` output. As well as
+the browser processes, the `WindowServer` and kernel tasks are shown
+because browsers often trigger significant load in them.
+
+The default sample period is 30,000 milliseconds (30 seconds), but that
+can be changed with the `-i` option.