Add build tracing
This creates a rotating build.trace.gz in the out directory that can be loaded with chrome://tracing. It'll include start and end timings for make/soong/kati/ninja, and it will import and time-correct the ninja log files. Test: m -j; load out/build.trace.gz in chrome://tracing Test: multiproduct_kati -keep; load out/multiproduct*/build.trace.gz Change-Id: Ic060fa9515eb88d95dbe16712479dae9dffcf626
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@@ -35,6 +35,9 @@ import (
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// vars is the list of variables to read. The values will be put in the
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// returned map.
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func DumpMakeVars(ctx Context, config Config, goals, extra_targets, vars []string) (map[string]string, error) {
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ctx.BeginTrace("dumpvars")
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defer ctx.EndTrace()
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cmd := exec.CommandContext(ctx.Context,
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"make",
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"--no-print-directory",
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