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Commit 9f337098 authored by Kean Mariotti's avatar Kean Mariotti
Browse files

system server: configure 4 MB perfetto shmem buffer 

Increase Perfetto's shmem buffer from default size (256 KB) to 4 MB
to avoid crashes (too long perfetto producer stalls) caused by shmem
chunks exhaustion/contention.

Bug: b/382369925
Flag: android.tracing.system_server_large_perfetto_shmem_buffer
Test: presubmit
Change-Id: I5b6ab40cb3987a7aed7bb09801f02bea3f3962a2
parent 57724986

core/java/android/tracing/flags.aconfig

+8 −0
Original line number Diff line number Diff line
@@ -70,3 +70,11 @@ flag { 
    is_fixed_read_only: true

    bug: "352538294"

}



flag {

    name: "system_server_large_perfetto_shmem_buffer"

    namespace: "windowing_tools"

    description: "Large perfetto shmem buffer"

    is_fixed_read_only: true

    bug: "382369925"

}

services/java/com/android/server/SystemServer.java

+7 −0
Original line number Diff line number Diff line
@@ -91,6 +91,7 @@ import android.server.ServerProtoEnums; 
import android.system.ErrnoException;

import android.system.Os;

import android.text.TextUtils;

import android.tracing.perfetto.InitArguments;

import android.util.ArrayMap;

import android.util.DisplayMetrics;

import android.util.Dumpable;
@@ -791,6 +792,12 @@ public final class SystemServer implements Dumpable { 
    private void run() {

        TimingsTraceAndSlog t = new TimingsTraceAndSlog();

        try {

            if (android.tracing.Flags.systemServerLargePerfettoShmemBuffer()) {

                // Explicitly initialize a 4 MB shmem buffer for Perfetto producers (b/382369925)

                android.tracing.perfetto.Producer.init(new InitArguments(

                        InitArguments.PERFETTO_BACKEND_SYSTEM, 4 * 1024));

            }



            t.traceBegin("InitBeforeStartServices");



            // Record the process start information in sys props.