| commit | 7b0f6ae58e74970ac3511d3fcfde001a0c611cad | [log] [tgz] |
|---|---|---|
| author | Mikhail Khokhlov <khokhlov@google.com> | Mon Jan 09 15:48:56 2023 |
| committer | Copybara-Service <copybara-worker@google.com> | Mon Jan 09 15:54:18 2023 |
| tree | ca8c71d93253909db98203092d06bf1036b073ce | |
| parent | eb2fd180ef241fec19e615a14ca091b283fbda9f [diff] |
[Tracing] Use Perfetto client library for tracing on Linux This CL switches the Chrome tracing backend to Perfetto client library. It means that Chrome on Linux will use a different set of TRACE_EVENT* macros that call Perfetto client API under the hood. Our end goal is to make Perfetto the default backend on all platforms, unblocking multiple improvements in tracing stability and usefulness. The Linux change is a first step towards that goal. Bug: 1006541 Change-Id: I85f27a2e4b91f219e9fb4f90a391f4b5df90baa3 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4147340 Reviewed-by: Andrew Grieve <agrieve@chromium.org> Commit-Queue: Mikhail Khokhlov <khokhlov@google.com> Reviewed-by: Eric Seckler <eseckler@chromium.org> Cr-Commit-Position: refs/heads/main@{#1090340} NOKEYCHECK=True GitOrigin-RevId: d9e2da27d146aedf4cd8fb1dfd75b593fd346e53
This directory is used to allow different products to customize settings for repos that are DEPS'ed in or shared.
For example: V8 could be built on its own (in a “standalone” configuration), and it could be built as part of Chromium. V8 might define a top-level target, //v8:d8 (a simple executable), that should only be built in the standalone configuration. To figure out whether or not it should be in a standalone configuration, v8 can create a file, build_overrides/v8.gni, that contains a variable, build_standalone_d8 = true. and import it (as import(“//build_overrides/v8.gni”) from its top-level BUILD.gn file.
Chromium, on the other hand, might not need to build d8, and so it would create its own build_overrides/v8.gni file, and in it set build_standalone_d8 = false.
The two files should define the same set of variables, but the values can vary as appropriate to the needs of the two different builds.
The build.gni file provides a way for projects to override defaults for variables used in //build itself (which we want to be shareable between projects).
TODO(crbug.com/588513): Ideally //build_overrides and, in particular, //build_overrides/build.gni should go away completely in favor of some mechanism that can re-use other required files like //.gn, so that we don't have to keep requiring projects to create a bunch of different files to use GN.