26 lines
1.5 KiB
Markdown
26 lines
1.5 KiB
Markdown
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# Overhauled performance tracing in Chrome
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We are upgrading Chrome's support for performance tracing by replacing Chrome's implementation of
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TRACE_EVENT macros from //base/trace_event with [Perfetto](https://perfetto.dev). Perfetto
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introduces [trace events with typed
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arguments](https://perfetto.dev/docs/instrumentation/track-events) to support privacy-filtered trace
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recording and a more compact, efficient, and stable trace encoding.
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The Perfetto library itself lives in
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[AOSP](https://android.googlesource.com/platform/external/perfetto/) and is rolled in
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[/third_party/chrome/](https://cs.chromium.org/chromium/src/third_party/perfetto/). Progress is
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tracked on https://crbug.com/1006541.
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The code in this directory connects Chrome to Perfetto's [tracing
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SDK](https://perfetto.dev/docs/instrumentation/tracing-sdk), which implements trace event macros on
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top of Perfetto's [tracing service](https://perfetto.dev/docs/concepts/service-model). This service
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can be run in-process (e.g. in unit tests), as a Chrome mojo service (see //services/tracing), or as
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a system service on Android.
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For more details, see [Perfetto's documentation](https://docs.perfetto.dev), [Typed trace events in
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Chrome](https://docs.google.com/document/d/1f7tt4cb-JcA5bQFR1oXk60ncJPpkL02_Hi_Bc6MfTQk/edit#), and
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[Typed trace events in
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//base](https://docs.google.com/document/d/1UQ4Ez7B-TeowijOUuMXuoWj1amZcQ7E2abt3s4jaAEY/edit#).
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Note: The integration with Perfetto's SDK is work-in-progress behind the gn flag
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"use_perfetto_client_library".
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