Each key has following meaning:

By default, every sort keys not specified in -F will be appended
automatically.

If the keys starts with a prefix '+', then it will append the specified
       field(s) to the default field order. For example: perf report -F +period,sample.

print_type can be either:
- flat: single column, linear exposure of call chains.
- graph: use a graph tree, displaying absolute overhead rates. (default)
- fractal: like graph, but displays relative rates. Each branch of
         the tree is considered as a new profiled object.
- folded: call chains are displayed in a line, separated by semicolons
- none: disable call chain display.

threshold is a percentage value which specifies a minimum percent to be
included in the output call graph.  Default is 0.5 (%).

print_limit is only applied when stdio interface is used.  It's to limit
number of call graph entries in a single hist entry.  Note that it needs
to be given after threshold (but not necessarily consecutive).
Default is 0 (unlimited).

order can be either:
- callee: callee based call graph.
- caller: inverted caller based call graph.
Default is 'caller' when --children is used, otherwise 'callee'.

sort_key can be:
- function: compare on functions (default)
- address: compare on individual code addresses
- srcline: compare on source filename and line number

branch can be:
- branch: include last branch information in callgraph when available.
          Usually more convenient to use --branch-history for this.

value can be:
- percent: display overhead percent (default)
- period: display event period
- count: display event count

Default: 127

"relative" means it's relative to filtered entries only so that the
sum of shown entries will be always 100%.  "absolute" means it retains
the original value before and after the filter is applied.

Also support time percent with multiple time ranges. Time string is
'a%/n,b%/m,...' or 'a%-b%,c%-%d,...'.

For example:
Select the second 10% time slice:

perf report --time 10%/2

Select from 0% to 10% time slice:

perf report --time 0%-10%

Select the first and second 10% time slices:

perf report --time 10%/1,10%/2

Select from 0% to 10% and 30% to 40% slices:

perf report --time 0%-10%,30%-40%

This may be interesting to measure a workload only after some initialization
phase is over, i.e. insert a perf probe at that point and then using this
option with that probe.

i        synthesize instructions events
b        synthesize branches events
c        synthesize branches events (calls only)
r        synthesize branches events (returns only)
x        synthesize transactions events
w        synthesize ptwrite events
p        synthesize power events
o        synthesize other events recorded due to the use
        of aux-output (refer to perf record)
e        synthesize error events
d        create a debug log
g        synthesize a call chain (use with i or x)
l        synthesize last branch entries (use with i or x)
s       skip initial number of events

The default is all events i.e. the same as --itrace=ibxwpe,
except for perf script where it is --itrace=ce

In addition, the period (default 100000, except for perf script where it is 1)
for instructions events can be specified in units of:

i        instructions
t        ticks
ms        milliseconds
us        microseconds
ns        nanoseconds (default)

Also the call chain size (default 16, max. 1024) for instructions or
transactions events can be specified.

Also the number of last branch entries (default 64, max. 1024) for
instructions or transactions events can be specified.

It is also possible to skip events generated (instructions, branches, transactions,
ptwrite, power) at the beginning. This is useful to ignore initialization code.

--itrace=i0nss1000000

skips the first million instructions.

To disable decoding entirely, use --no-itrace.

Please note that not all mmaps are stored, options affecting which ones
are include 'perf record --data', for instance.

The local/global keywords set if the percentage is computed
in the scope of the function (local) or the whole data (global).
The period/hits keywords set the base the percentage is computed
on - the samples period or the number of samples (hits).

'Sampled Cycles%' - block sampled cycles aggregation / total sampled cycles
'Sampled Cycles'  - block sampled cycles aggregation
'Avg Cycles%'     - block average sampled cycles / sum of total block average
                    sampled cycles
'Avg Cycles'      - block average sampled cycles