tag | 23c12037e44a7f9f3d33c1f57a98456427989b19 | |
---|---|---|
tagger | The Android Open Source Project <initial-contribution@android.com> | Fri May 31 15:50:54 2019 -0700 |
object | c5e18407c277ca75b854b4416c70d23dc2c6a90e |
Android 9.0.0 release 40
commit | c5e18407c277ca75b854b4416c70d23dc2c6a90e | [log] [tgz] |
---|---|---|
author | Hector Dearman <hjd@google.com> | Wed Jun 20 10:57:06 2018 +0100 |
committer | Primiano Tucci <primiano@google.com> | Wed Jun 20 15:14:06 2018 +0100 |
tree | 4c03e4372ba0c8cc83880b65bb608d16442753e3 | |
parent | 05cd4b895e5d78ef82448cb9bf71fba6b1ad48ae [diff] |
traced_probes: Fix clock bug There was a bug when parsing the list of available clocks from /d/tracing/trace_clock. The contents of /d/tracing/trace_clock looks like: uptime perf mono mono_raw boot\n We acidentally included the newline in the name of the final clock when reading. This means (if boot is unfortunate enough to be the last clock listed) we fail to set the boot clock (since "boot" != "boot\n"). Fix the parsing of trace_clock to discount the newline. Bug: 110356412 Change-Id: I5160637efec69844fe75f8e705d02a7c486ae990 Merged-In: I5160637efec69844fe75f8e705d02a7c486ae990 (cherry picked from commit 22dac14815a58d00ea87a0013bb638c703843f11)
Perfetto is an open-source project for performance instrumentation and tracing of Linux/Android/Chrome platforms and user-space apps.
It consists of:
A portable, high efficiency, user-space tracing library
designed for tracing of multi-process systems, based on zero-alloc zero-copy zero-syscall (on fast-paths) writing of protobufs over shared memory.
OS-wide Linux/Android probes for platform debugging
Web-based frontend
A UI for inspection and analysis of traces (coming soon).
Batch processing of traces
A python / C++ (TBD) library for trace-based metrics (coming soon).
Perfetto is building the next-gen unified tracing ecosystem for:
The goal is to create an open, portable and developer friendly tracing ecosystem for app and platform performance debugging.
Designed for production
Perfetto's tracing library and daemons are designed for use in production. Privilege isolation is a key design goal:
See docs/security-model.md for more details.
Long traces
Pefetto aims at supporting hours-long / O(100GB) traces, both in terms of recording backend and UI frontend.
Interoperability
Perfetto traces (output) and configuration (input) consists of protobuf messages, in order to allow interoperability with several languages.
See docs/trace-format.md for more details.
Composability
As Perfetto is designed both for OS-level tracing and app-level tracing, its design allows to compose several instances of the Perfetto tracing library, allowing to nest multiple layers of tracing and drive then with the same frontend. This allows powerful blending of app-specific and OS-wide trace events. See docs/multi-layer-tracing.md for more details.
Portability
The only dependencies of Perfetto's tracing libraries are C++11 and Protobuf lite (plus google-test, google-benchmark, libprotobuf-full for testing).
Extensibility
Perfetto allows third parties to defined their own protobufs for:
Allowing apps to define their own strongly-typed input and output schema. See docs/trace-format.md for more details.