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// Copyright 2016 Google Inc. All Rights Reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
// Profile is a common stacktrace profile format.
// Measurements represented with this format should follow the
// following conventions:
// - Consumers should treat unset optional fields as if they had been
// set with their default value.
// - When possible, measurements should be stored in "unsampled" form
// that is most useful to humans. There should be enough
// information present to determine the original sampled values.
// - On-disk, the serialized proto must be gzip-compressed.
// - The profile is represented as a set of samples, where each sample
// references a sequence of locations, and where each location belongs
// to a mapping.
// - There is a N->1 relationship from sample.location_id entries to
// locations. For every sample.location_id entry there must be a
// unique Location with that id.
// - There is an optional N->1 relationship from locations to
// mappings. For every nonzero Location.mapping_id there must be a
// unique Mapping with that id.
syntax = "proto3";
package perftools.profiles;
option java_package = "";
option java_outer_classname = "ProfileProto";
message Profile {
// A description of the samples associated with each Sample.value.
// For a cpu profile this might be:
// [["cpu","nanoseconds"]] or [["wall","seconds"]] or [["syscall","count"]]
// For a heap profile, this might be:
// [["allocations","count"], ["space","bytes"]],
// If one of the values represents the number of events represented
// by the sample, by convention it should be at index 0 and use
// sample_type.unit == "count".
repeated ValueType sample_type = 1;
// The set of samples recorded in this profile.
repeated Sample sample = 2;
// Mapping from address ranges to the image/binary/library mapped
// into that address range. mapping[0] will be the main binary.
repeated Mapping mapping = 3;
// Useful program location
repeated Location location = 4;
// Functions referenced by locations
repeated Function function = 5;
// A common table for strings referenced by various messages.
// string_table[0] must always be "".
repeated string string_table = 6;
// frames with Function.function_name fully matching the following
// regexp will be dropped from the samples, along with their successors.
int64 drop_frames = 7; // Index into string table.
// frames with Function.function_name fully matching the following
// regexp will be kept, even if it matches drop_frames.
int64 keep_frames = 8; // Index into string table.
// The following fields are informational, do not affect
// interpretation of results.
// Time of collection (UTC) represented as nanoseconds past the epoch.
int64 time_nanos = 9;
// Duration of the profile, if a duration makes sense.
int64 duration_nanos = 10;
// The kind of events between sampled ocurrences.
// e.g [ "cpu","cycles" ] or [ "heap","bytes" ]
ValueType period_type = 11;
// The number of events between sampled occurrences.
int64 period = 12;
// Free-form text associated with the profile. The text is displayed as is
// to the user by the tools that read profiles (e.g. by pprof). This field
// should not be used to store any machine-readable information, it is only
// for human-friendly content. The profile must stay functional if this field
// is cleaned.
repeated int64 comment = 13; // Indices into string table.
// Index into the string table of the type of the preferred sample
// value. If unset, clients should default to the last sample value.
int64 default_sample_type = 14;
// ValueType describes the semantics and measurement units of a value.
message ValueType {
int64 type = 1; // Index into string table.
int64 unit = 2; // Index into string table.
// Each Sample records values encountered in some program
// context. The program context is typically a stack trace, perhaps
// augmented with auxiliary information like the thread-id, some
// indicator of a higher level request being handled etc.
message Sample {
// The ids recorded here correspond to a
// The leaf is at location_id[0].
repeated uint64 location_id = 1;
// The type and unit of each value is defined by the corresponding
// entry in Profile.sample_type. All samples must have the same
// number of values, the same as the length of Profile.sample_type.
// When aggregating multiple samples into a single sample, the
// result has a list of values that is the element-wise sum of the
// lists of the originals.
repeated int64 value = 2;
// label includes additional context for this sample. It can include
// things like a thread id, allocation size, etc.
// NOTE: While possible, having multiple values for the same label key is
// strongly discouraged and should never be used. Most tools (e.g. pprof) do
// not have good (or any) support for multi-value labels. And an even more
// discouraged case is having a string label and a numeric label of the same
// name on a sample. Again, possible to express, but should not be used.
repeated Label label = 3;
message Label {
int64 key = 1; // Index into string table
// At most one of the following must be present
int64 str = 2; // Index into string table
int64 num = 3;
// Should only be present when num is present.
// Specifies the units of num.
// Use arbitrary string (for example, "requests") as a custom count unit.
// If no unit is specified, consumer may apply heuristic to deduce the unit.
// Consumers may also interpret units like "bytes" and "kilobytes" as memory
// units and units like "seconds" and "nanoseconds" as time units,
// and apply appropriate unit conversions to these.
int64 num_unit = 4; // Index into string table
message Mapping {
// Unique nonzero id for the mapping.
uint64 id = 1;
// Address at which the binary (or DLL) is loaded into memory.
uint64 memory_start = 2;
// The limit of the address range occupied by this mapping.
uint64 memory_limit = 3;
// Offset in the binary that corresponds to the first mapped address.
uint64 file_offset = 4;
// The object this entry is loaded from. This can be a filename on
// disk for the main binary and shared libraries, or virtual
// abstractions like "[vdso]".
int64 filename = 5; // Index into string table
// A string that uniquely identifies a particular program version
// with high probability. E.g., for binaries generated by GNU tools,
// it could be the contents of the field.
int64 build_id = 6; // Index into string table
// The following fields indicate the resolution of symbolic info.
bool has_functions = 7;
bool has_filenames = 8;
bool has_line_numbers = 9;
bool has_inline_frames = 10;
// Describes function and line table debug information.
message Location {
// Unique nonzero id for the location. A profile could use
// instruction addresses or any integer sequence as ids.
uint64 id = 1;
// The id of the corresponding profile.Mapping for this location.
// It can be unset if the mapping is unknown or not applicable for
// this profile type.
uint64 mapping_id = 2;
// The instruction address for this location, if available. It
// should be within [Mapping.memory_start...Mapping.memory_limit]
// for the corresponding mapping. A non-leaf address may be in the
// middle of a call instruction. It is up to display tools to find
// the beginning of the instruction if necessary.
uint64 address = 3;
// Multiple line indicates this location has inlined functions,
// where the last entry represents the caller into which the
// preceding entries were inlined.
// E.g., if memcpy() is inlined into printf:
// line[0].function_name == "memcpy"
// line[1].function_name == "printf"
repeated Line line = 4;
// Provides an indication that multiple symbols map to this location's
// address, for example due to identical code folding by the linker. In that
// case the line information above represents one of the multiple
// symbols. This field must be recomputed when the symbolization state of the
// profile changes.
bool is_folded = 5;
message Line {
// The id of the corresponding profile.Function for this line.
uint64 function_id = 1;
// Line number in source code.
int64 line = 2;
message Function {
// Unique nonzero id for the function.
uint64 id = 1;
// Name of the function, in human-readable form if available.
int64 name = 2; // Index into string table
// Name of the function, as identified by the system.
// For instance, it can be a C++ mangled name.
int64 system_name = 3; // Index into string table
// Source file containing the function.
int64 filename = 4; // Index into string table
// Line number in source file.
int64 start_line = 5;