From 929f8cf8216bca0ef86e67b25c390afd52d7bd17 Mon Sep 17 00:00:00 2001
From: cobalt-github-releaser-bot
 <95661244+cobalt-github-releaser-bot@users.noreply.github.com>
Date: Tue, 1 Oct 2024 13:17:47 -0700
Subject: [PATCH] Cherry pick PR #4155: Fallback to 100 ticks per second for
 CPU usage calculation. (#4180)

Refer to the original PR: https://github.com/youtube/cobalt/pull/4155

b/341774149

Co-authored-by: aee <aee@google.com>
---
 cobalt/base/process/process_metrics_helper.cc | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/cobalt/base/process/process_metrics_helper.cc b/cobalt/base/process/process_metrics_helper.cc
index 9300ab810362..df20c890cf5c 100644
--- a/cobalt/base/process/process_metrics_helper.cc
+++ b/cobalt/base/process/process_metrics_helper.cc
@@ -64,7 +64,8 @@ double CalculateCPUUsageSeconds(const std::string& utime_string,
 
 // static
 int ProcessMetricsHelper::GetClockTicksPerS() {
-  return clock_ticks_per_s.load();
+  int result = clock_ticks_per_s.load();
+  return result > 0 ? result : 100;
 }
 
 // static
@@ -104,15 +105,12 @@ void ProcessMetricsHelper::PopulateClockTicksPerS() {
 
 // static
 TimeDelta ProcessMetricsHelper::GetCumulativeCPUUsage() {
-  int ticks_per_s = clock_ticks_per_s.load();
-  if (ticks_per_s == 0) return TimeDelta();
-  return GetCPUUsage(FilePath("/proc/self"), ticks_per_s);
+  return GetCPUUsage(FilePath("/proc/self"), GetClockTicksPerS());
 }
 
 // static
 Value ProcessMetricsHelper::GetCumulativeCPUUsagePerThread() {
-  int ticks_per_s = clock_ticks_per_s.load();
-  if (ticks_per_s == 0) return Value();
+  int ticks_per_s = GetClockTicksPerS();
   ListValue cpu_per_thread;
   FileEnumerator file_enum(FilePath("/proc/self/task"), /*recursive=*/false,
                            FileEnumerator::DIRECTORIES);