Field list can be prepended with the type, trace, sw or hw,
to indicate to which event type the field list applies.
e.g., -F sw:comm,tid,time,ip,sym  and -F trace:time,cpu,trace

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.

It's possible tp add/remove fields only for specific event type:

-Fsw:-cpu,-period

removes cpu and period from software events.

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 "bcrosyiABExghDt" which stand for branch,
call, return, conditional, system, asynchronous, interrupt,
transaction abort, trace begin, trace end, in transaction, VM-Entry,
VM-Exit, interrupt disabled and interrupt disable toggle 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", "vmentry" for "bcg", "vmexit" for "bch".
However the "x", "D" and "t" flags will be displayed separately in those
cases e.g. "jcc     (xD)" for a condition branch within a transaction
with interrupts disabled. Note, interrupts becoming disabled is "t",
whereas interrupts becoming enabled is "Dt".

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, disasm and insnlen give the
instruction bytes, disassembled instructions (requires libcapstone support)
and the instruction length of the current instruction respectively.

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

The ipc (instructions per cycle) field is synthesized and may have a value when
Instruction Trace decoding.

The machine_pid and vcpu fields are derived from data resulting from using
perf inject to insert a perf.data file recorded inside a virtual machine into
a perf.data file recorded on the host at the same time.

The cgroup fields requires sample having the cgroup id which is saved
when "--all-cgroups" option is passed to 'perf record'.

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.

Use brstackinsnlen to print the brstackinsn lenght. For example, you
can’t know the next sequential instruction after an unconditional branch unless
you calculate that based on its length.

brstackdisasm acts like brstackinsn, but will print disassembled instructions if
perf is built with the capstone library.

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 events defining metrics with the :S option
for perf record. perf will sample on the first event, and
print computed metrics for all the events in the group. Please note
that the metric computed is averaged over the whole sampling
period (since the last sample), 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
y        synthesize cycles events
b        synthesize branches events (branch misses for Arm SPE)
c        synthesize branches events (calls only)
r        synthesize branches events (returns only)
x        synthesize transactions events
w        synthesize ptwrite events
p        synthesize power events (incl. PSB events for Intel PT)
o        synthesize other events recorded due to the use


        of aux-output (refer to perf record)
I        synthesize interrupt or similar (asynchronous) events


        (e.g. Intel PT Event Trace)
e        synthesize error events
d        create a debug log
f        synthesize first level cache events
m        synthesize last level cache events
M        synthesize memory events
t        synthesize TLB events
a        synthesize remote access events
g        synthesize a call chain (use with i or x)
G        synthesize a call chain on existing event records
l        synthesize last branch entries (use with i or x)
L        synthesize last branch entries on existing event records
s       skip initial number of events
q        quicker (less detailed) decoding
A        approximate IPC
Z        prefer to ignore timestamps (so-called "timeless" decoding)
T        use the timestamp trace as kernel time

The default is all events i.e. the same as --itrace=iybxwpe,
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.

Similar to options g and l, size may also be specified for options G and L.
On x86, note that G and L work poorly when data has been recorded with
large PEBS. Refer linkperf:perf-intel-pt[1] man page for details.

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.

The 'e' option may be followed by flags which affect what errors will or
will not be reported. Each flag must be preceded by either '+' or '-'.
The flags are:


        o        overflow


        l        trace data lost

If supported, the 'd' option may be followed by flags which affect what
debug messages will or will not be logged. Each flag must be preceded
by either '+' or '-'. The flags are:


        a        all perf events


        e        output only on errors (size configurable - see linkperf:perf-config[1])


        o        output to stdout

If supported, the 'q' option may be repeated to increase the effect.

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

Default: 127

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 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%

The hexadecimal address may be the start address of a symbol or
any other address to filter the trace records

For example, to select the symbol noploop or the address 0x4007a0:
perf script --symbols=noploop,0x4007a0

Support filtering trace records by symbol name, start address of
symbol, any hexadecimal address and address range.

The comparison order is:

For example, to list the traced records within the address range
[0x4007a0, 0x0x4007a9]:
perf script -S 0x4007a0 --addr-range 10