perf script -F <fields>

is equivalent to:

perf script -F trace:<fields> -F sw:<fields> -F hw:<fields>

i.e., the specified fields apply to all event types if the type string
is not given.

In addition to overriding fields, it is also possible to add or remove
fields from the defaults. For example

-F -cpu,+insn

removes the cpu field and adds the insn field. Adding/removing fields
cannot be mixed with normal overriding.

The arguments are processed in the order received. A later usage can
reset a prior request. e.g.:

-F trace: -F comm,tid,time,ip,sym

The first -F suppresses trace events (field list is ""), but then the
second invocation sets the fields to comm,tid,time,ip,sym. In this case a
warning is given to the user:

"Overriding previous field request for all events."

Alternatively, consider the order:

-F comm,tid,time,ip,sym -F trace:

The first -F sets the fields for all events and the second -F
suppresses trace events. The user is given a warning message about
the override, and the result of the above is that only S/W and H/W
events are displayed with the given fields.

For the 'wildcard' option if a user selected field is invalid for an
event type, a message is displayed to the user that the option is
ignored for that type. For example:

$ perf script -F comm,tid,trace
'trace' not valid for hardware events. Ignoring.
'trace' not valid for software events. Ignoring.

Alternatively, if the type is given an invalid field is specified it
is an error. For example:

perf script -v -F sw:comm,tid,trace
'trace' not valid for software events.

At this point usage is displayed, and perf-script exits.

The flags field is synthesized and may have a value when Instruction
Trace decoding. The flags are "bcrosyiABEx" which stand for branch,
call, return, conditional, system, asynchronous, interrupt,
transaction abort, trace begin, trace end, and in transaction,
respectively. Known combinations of flags are printed more nicely e.g.
"call" for "bc", "return" for "br", "jcc" for "bo", "jmp" for "b",
"int" for "bci", "iret" for "bri", "syscall" for "bcs", "sysret" for "brs",
"async" for "by", "hw int" for "bcyi", "tx abrt" for "bA", "tr strt" for "bB",
"tr end" for "bE". However the "x" flag will be display separately in those
cases e.g. "jcc     (x)" for a condition branch within a transaction.

The callindent field is synthesized and may have a value when
Instruction Trace decoding. For calls and returns, it will display the
name of the symbol indented with spaces to reflect the stack depth.

When doing instruction trace decoding insn and insnlen give the
instruction bytes and the instruction length of the current
instruction.

The synth field is used by synthesized events which may be created when
Instruction Trace decoding.

Finally, a user may not set fields to none for all event types.
i.e., -F "" is not allowed.

The brstack output includes branch related information with raw addresses using the
/v/v/v/v/cycles syntax in the following order:
FROM: branch source instruction
TO  : branch target instruction
M/P/-: M=branch target mispredicted or branch direction was mispredicted, P=target predicted or direction predicted, -=not supported
X/- : X=branch inside a transactional region, -=not in transaction region or not supported
A/- : A=TSX abort entry, -=not aborted region or not supported
cycles

The brstacksym is identical to brstack, except that the FROM and TO addresses are printed in a symbolic form if possible.

When brstackinsn is specified the full assembler sequences of branch sequences for each sample
is printed. This is the full execution path leading to the sample. This is only supported when the
sample was recorded with perf record -b or -j any.

The brstackoff field will print an offset into a specific dso/binary.

With the metric option perf script can compute metrics for
sampling periods, similar to perf stat. This requires
specifying a group with multiple metrics with the :S option
for perf record. perf will sample on the first event, and
compute metrics for all the events in the group. Please note
that the metric computed is averaged over the whole sampling
period, not just for the sample point.

For sample events it's possible to display misc field with -F +misc option,
following letters are displayed for each bit:

PERF_RECORD_MISC_KERNEL               K
PERF_RECORD_MISC_USER                 U
PERF_RECORD_MISC_HYPERVISOR           H
PERF_RECORD_MISC_GUEST_KERNEL         G
PERF_RECORD_MISC_GUEST_USER           g
PERF_RECORD_MISC_MMAP_DATA*           M
PERF_RECORD_MISC_COMM_EXEC            E
PERF_RECORD_MISC_SWITCH_OUT           S
PERF_RECORD_MISC_SWITCH_OUT_PREEMPT   Sp

$ perf script -F +misc ...


 sched-messaging  1414 K     28690.636582:       4590 cycles ...


 sched-messaging  1407 U     28690.636600:     325620 cycles ...


 sched-messaging  1414 K     28690.636608:      19473 cycles ...
misc field ___________/

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
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.

Default: /proc/sys/kernel/perf_event_max_stack when present, 127 otherwise.

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

For example:
Select the second 10% time slice:
perf script --time 10%/2

Select from 0% to 10% time slice:
perf script --time 0%-10%

Select the first and second 10% time slices:
perf script --time 10%/1,10%/2

Select from 0% to 10% and 30% to 40% slices:
perf script --time 0%-10%,30%-40%