Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 493 insertions, 0 deletions

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+perf-report(1)
+==============
+
+NAME
+----
+perf-report - Read perf.data (created by perf record) and display the profile
+
+SYNOPSIS
+--------
+[verse]
+'perf report' [-i <file> | --input=file]
+
+DESCRIPTION
+-----------
+This command displays the performance counter profile information recorded
+via perf record.
+
+OPTIONS
+-------
+-i::
+--input=::
+        Input file name. (default: perf.data unless stdin is a fifo)
+
+-v::
+--verbose::
+        Be more verbose. (show symbol address, etc)
+
+-q::
+--quiet::
+	Do not show any message.  (Suppress -v)
+
+-n::
+--show-nr-samples::
+	Show the number of samples for each symbol
+
+--show-cpu-utilization::
+        Show sample percentage for different cpu modes.
+
+-T::
+--threads::
+	Show per-thread event counters.  The input data file should be recorded
+	with -s option.
+-c::
+--comms=::
+	Only consider symbols in these comms. CSV that understands
+	file://filename entries.  This option will affect the percentage of
+	the overhead column.  See --percentage for more info.
+--pid=::
+        Only show events for given process ID (comma separated list).
+
+--tid=::
+        Only show events for given thread ID (comma separated list).
+-d::
+--dsos=::
+	Only consider symbols in these dsos. CSV that understands
+	file://filename entries.  This option will affect the percentage of
+	the overhead column.  See --percentage for more info.
+-S::
+--symbols=::
+	Only consider these symbols. CSV that understands
+	file://filename entries.  This option will affect the percentage of
+	the overhead column.  See --percentage for more info.
+
+--symbol-filter=::
+	Only show symbols that match (partially) with this filter.
+
+-U::
+--hide-unresolved::
+        Only display entries resolved to a symbol.
+
+-s::
+--sort=::
+	Sort histogram entries by given key(s) - multiple keys can be specified
+	in CSV format.  Following sort keys are available:
+	pid, comm, dso, symbol, parent, cpu, socket, srcline, weight,
+	local_weight, cgroup_id.
+
+	Each key has following meaning:
+
+	- comm: command (name) of the task which can be read via /proc/<pid>/comm
+	- pid: command and tid of the task
+	- dso: name of library or module executed at the time of sample
+	- dso_size: size of library or module executed at the time of sample
+	- symbol: name of function executed at the time of sample
+	- symbol_size: size of function executed at the time of sample
+	- parent: name of function matched to the parent regex filter. Unmatched
+	entries are displayed as "[other]".
+	- cpu: cpu number the task ran at the time of sample
+	- socket: processor socket number the task ran at the time of sample
+	- srcline: filename and line number executed at the time of sample.  The
+	DWARF debugging info must be provided.
+	- srcfile: file name of the source file of the same. Requires dwarf
+	information.
+	- weight: Event specific weight, e.g. memory latency or transaction
+	abort cost. This is the global weight.
+	- local_weight: Local weight version of the weight above.
+	- cgroup_id: ID derived from cgroup namespace device and inode numbers.
+	- transaction: Transaction abort flags.
+	- overhead: Overhead percentage of sample
+	- overhead_sys: Overhead percentage of sample running in system mode
+	- overhead_us: Overhead percentage of sample running in user mode
+	- overhead_guest_sys: Overhead percentage of sample running in system mode
+	on guest machine
+	- overhead_guest_us: Overhead percentage of sample running in user mode on
+	guest machine
+	- sample: Number of sample
+	- period: Raw number of event count of sample
+
+	By default, comm, dso and symbol keys are used.
+	(i.e. --sort comm,dso,symbol)
+
+	If --branch-stack option is used, following sort keys are also
+	available:
+
+	- dso_from: name of library or module branched from
+	- dso_to: name of library or module branched to
+	- symbol_from: name of function branched from
+	- symbol_to: name of function branched to
+	- srcline_from: source file and line branched from
+	- srcline_to: source file and line branched to
+	- mispredict: "N" for predicted branch, "Y" for mispredicted branch
+	- in_tx: branch in TSX transaction
+	- abort: TSX transaction abort.
+	- cycles: Cycles in basic block
+
+	And default sort keys are changed to comm, dso_from, symbol_from, dso_to
+	and symbol_to, see '--branch-stack'.
+
+	If the --mem-mode option is used, the following sort keys are also available
+	(incompatible with --branch-stack):
+	symbol_daddr, dso_daddr, locked, tlb, mem, snoop, dcacheline.
+
+	- symbol_daddr: name of data symbol being executed on at the time of sample
+	- dso_daddr: name of library or module containing the data being executed
+	on at the time of the sample
+	- locked: whether the bus was locked at the time of the sample
+	- tlb: type of tlb access for the data at the time of the sample
+	- mem: type of memory access for the data at the time of the sample
+	- snoop: type of snoop (if any) for the data at the time of the sample
+	- dcacheline: the cacheline the data address is on at the time of the sample
+	- phys_daddr: physical address of data being executed on at the time of sample
+
+	And the default sort keys are changed to local_weight, mem, sym, dso,
+	symbol_daddr, dso_daddr, snoop, tlb, locked, see '--mem-mode'.
+
+	If the data file has tracepoint event(s), following (dynamic) sort keys
+	are also available:
+	trace, trace_fields, [<event>.]<field>[/raw]
+
+	- trace: pretty printed trace output in a single column
+	- trace_fields: fields in tracepoints in separate columns
+	- <field name>: optional event and field name for a specific field
+
+	The last form consists of event and field names.  If event name is
+	omitted, it searches all events for matching field name.  The matched
+	field will be shown only for the event has the field.  The event name
+	supports substring match so user doesn't need to specify full subsystem
+	and event name everytime.  For example, 'sched:sched_switch' event can
+	be shortened to 'switch' as long as it's not ambiguous.  Also event can
+	be specified by its index (starting from 1) preceded by the '%'.
+	So '%1' is the first event, '%2' is the second, and so on.
+
+	The field name can have '/raw' suffix which disables pretty printing
+	and shows raw field value like hex numbers.  The --raw-trace option
+	has the same effect for all dynamic sort keys.
+
+	The default sort keys are changed to 'trace' if all events in the data
+	file are tracepoint.
+
+-F::
+--fields=::
+	Specify output field - multiple keys can be specified in CSV format.
+	Following fields are available:
+	overhead, overhead_sys, overhead_us, overhead_children, sample and period.
+	Also it can contain any sort key(s).
+
+	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.
+
+-p::
+--parent=<regex>::
+        A regex filter to identify parent. The parent is a caller of this
+	function and searched through the callchain, thus it requires callchain
+	information recorded. The pattern is in the extended regex format and
+	defaults to "\^sys_|^do_page_fault", see '--sort parent'.
+
+-x::
+--exclude-other::
+        Only display entries with parent-match.
+
+-w::
+--column-widths=<width[,width...]>::
+	Force each column width to the provided list, for large terminal
+	readability.  0 means no limit (default behavior).
+
+-t::
+--field-separator=::
+	Use a special separator character and don't pad with spaces, replacing
+	all occurrences of this separator in symbol names (and other output)
+	with a '.' character, that thus it's the only non valid separator.
+
+-D::
+--dump-raw-trace::
+        Dump raw trace in ASCII.
+
+-g::
+--call-graph=<print_type,threshold[,print_limit],order,sort_key[,branch],value>::
+        Display call chains using type, min percent threshold, print limit,
+	call order, sort key, optional branch and value.  Note that ordering
+	is not fixed so any parameter can be given in an arbitrary order.
+	One exception is the print_limit which should be preceded by threshold.
+
+	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: diplay overhead percent (default)
+	- period: display event period
+	- count: display event count
+
+--children::
+	Accumulate callchain of children to parent entry so that then can
+	show up in the output.  The output will have a new "Children" column
+	and will be sorted on the data.  It requires callchains are recorded.
+	See the `overhead calculation' section for more details. Enabled by
+	default, disable with --no-children.
+
+--max-stack::
+	Set the stack depth limit when parsing the callchain, anything
+	beyond the specified depth will be ignored. This is a trade-off
+	between information loss and faster processing especially for
+	workloads that can have a very long callchain stack.
+	Note that when using the --itrace option the synthesized callchain size
+	will override this value if the synthesized callchain size is bigger.
+
+	Default: 127
+
+-G::
+--inverted::
+        alias for inverted caller based call graph.
+
+--ignore-callees=<regex>::
+        Ignore callees of the function(s) matching the given regex.
+        This has the effect of collecting the callers of each such
+        function into one place in the call-graph tree.
+
+--pretty=<key>::
+        Pretty printing style.  key: normal, raw
+
+--stdio:: Use the stdio interface.
+
+--stdio-color::
+	'always', 'never' or 'auto', allowing configuring color output
+	via the command line, in addition to via "color.ui" .perfconfig.
+	Use '--stdio-color always' to generate color even when redirecting
+	to a pipe or file. Using just '--stdio-color' is equivalent to
+	using 'always'.
+
+--tui:: Use the TUI interface, that is integrated with annotate and allows
+        zooming into DSOs or threads, among other features. Use of --tui
+	requires a tty, if one is not present, as when piping to other
+	commands, the stdio interface is used.
+
+--gtk:: Use the GTK2 interface.
+
+-k::
+--vmlinux=<file>::
+        vmlinux pathname
+
+--ignore-vmlinux::
+	Ignore vmlinux files.
+
+--kallsyms=<file>::
+        kallsyms pathname
+
+-m::
+--modules::
+        Load module symbols. WARNING: This should only be used with -k and
+        a LIVE kernel.
+
+-f::
+--force::
+        Don't do ownership validation.
+
+--symfs=<directory>::
+        Look for files with symbols relative to this directory.
+
+-C::
+--cpu:: Only report samples for the list of CPUs provided. Multiple CPUs can
+	be provided as a comma-separated list with no space: 0,1. Ranges of
+	CPUs are specified with -: 0-2. Default is to report samples on all
+	CPUs.
+
+-M::
+--disassembler-style=:: Set disassembler style for objdump.
+
+--source::
+	Interleave source code with assembly code. Enabled by default,
+	disable with --no-source.
+
+--asm-raw::
+	Show raw instruction encoding of assembly instructions.
+
+--show-total-period:: Show a column with the sum of periods.
+
+-I::
+--show-info::
+	Display extended information about the perf.data file. This adds
+	information which may be very large and thus may clutter the display.
+	It currently includes: cpu and numa topology of the host system.
+
+-b::
+--branch-stack::
+	Use the addresses of sampled taken branches instead of the instruction
+	address to build the histograms. To generate meaningful output, the
+	perf.data file must have been obtained using perf record -b or
+	perf record --branch-filter xxx where xxx is a branch filter option.
+	perf report is able to auto-detect whether a perf.data file contains
+	branch stacks and it will automatically switch to the branch view mode,
+	unless --no-branch-stack is used.
+
+--branch-history::
+	Add the addresses of sampled taken branches to the callstack.
+	This allows to examine the path the program took to each sample.
+	The data collection must have used -b (or -j) and -g.
+
+--objdump=<path>::
+        Path to objdump binary.
+
+--group::
+	Show event group information together. It forces group output also
+	if there are no groups defined in data file.
+
+--demangle::
+	Demangle symbol names to human readable form. It's enabled by default,
+	disable with --no-demangle.
+
+--demangle-kernel::
+	Demangle kernel symbol names to human readable form (for C++ kernels).
+
+--mem-mode::
+	Use the data addresses of samples in addition to instruction addresses
+	to build the histograms.  To generate meaningful output, the perf.data
+	file must have been obtained using perf record -d -W and using a
+	special event -e cpu/mem-loads/p or -e cpu/mem-stores/p. See
+	'perf mem' for simpler access.
+
+--percent-limit::
+	Do not show entries which have an overhead under that percent.
+	(Default: 0).  Note that this option also sets the percent limit (threshold)
+	of callchains.  However the default value of callchain threshold is
+	different than the default value of hist entries.  Please see the
+	--call-graph option for details.
+
+--percentage::
+	Determine how to display the overhead percentage of filtered entries.
+	Filters can be applied by --comms, --dsos and/or --symbols options and
+	Zoom operations on the TUI (thread, dso, etc).
+
+	"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.
+
+--header::
+	Show header information in the perf.data file.  This includes
+	various information like hostname, OS and perf version, cpu/mem
+	info, perf command line, event list and so on.  Currently only
+	--stdio output supports this feature.
+
+--header-only::
+	Show only perf.data header (forces --stdio).
+
+--time::
+	Only analyze samples within given time window: <start>,<stop>. Times
+	have the format seconds.microseconds. If start is not given (i.e., time
+	string is ',x.y') then analysis starts at the beginning of the file. If
+	stop time is not given (i.e, time string is 'x.y,') then analysis goes
+	to end of file.
+
+	Also support time percent with multiple time range. 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%
+
+--itrace::
+	Options for decoding instruction tracing data. The options are:
+
+include::itrace.txt[]
+
+	To disable decoding entirely, use --no-itrace.
+
+--full-source-path::
+	Show the full path for source files for srcline output.
+
+--show-ref-call-graph::
+	When multiple events are sampled, it may not be needed to collect
+	callgraphs for all of them. The sample sites are usually nearby,
+	and it's enough to collect the callgraphs on a reference event.
+	So user can use "call-graph=no" event modifier to disable callgraph
+	for other events to reduce the overhead.
+	However, perf report cannot show callgraphs for the event which
+	disable the callgraph.
+	This option extends the perf report to show reference callgraphs,
+	which collected by reference event, in no callgraph event.
+
+--socket-filter::
+	Only report the samples on the processor socket that match with this filter
+
+--raw-trace::
+	When displaying traceevent output, do not use print fmt or plugins.
+
+--hierarchy::
+	Enable hierarchical output.
+
+--inline::
+	If a callgraph address belongs to an inlined function, the inline stack
+	will be printed. Each entry is function name or file/line. Enabled by
+	default, disable with --no-inline.
+
+--mmaps::
+	Show --tasks output plus mmap information in a format similar to
+	/proc/<PID>/maps.
+
+	Please note that not all mmaps are stored, options affecting which ones
+	are include 'perf record --data', for instance.
+
+--stats::
+	Display overall events statistics without any further processing.
+	(like the one at the end of the perf report -D command)
+
+--tasks::
+	Display monitored tasks stored in perf data. Displaying pid/tid/ppid
+	plus the command string aligned to distinguish parent and child tasks.
+
+--percent-type::
+	Set annotation percent type from following choices:
+	  global-period, local-period, global-hits, local-hits
+
+	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).
+
+include::callchain-overhead-calculation.txt[]
+
+SEE ALSO
+--------
+linkperf:perf-stat[1], linkperf:perf-annotate[1], linkperf:perf-record[1]