Revert "Reland "Use thresholds based on RAM size for OOM intervention""

This reverts commit 9191004f.

Reason for revert: The failure after the revert was a different failure.
Sorry for the reland.

Original change's description:
> Reland "Use thresholds based on RAM size for OOM intervention"
> 
> This reverts commit 50257b9e.
> 
> Reason for revert: This was not the cause of failure, see
> https://crbug.com/845763
> 
> Original change's description:
> > Revert "Use thresholds based on RAM size for OOM intervention"
> > 
> > This reverts commit 0c2124b3.
> > 
> > Reason for revert: Speculatively reverting to see if it fixes webgl conformance test timeouts
> > Bug: 845411
> > 
> > Original change's description:
> > > Use thresholds based on RAM size for OOM intervention
> > > 
> > > This CL does not change behavior of existing experiment on 512 devices.
> > > 1. Remove low-end device checks while enabling intervention. This can be
> > >    filtered in Finch config.
> > > 2. Set threshold based on percentage of RAM instead of absolute number.
> > > 3. Disable intervention if device has more than 512MB RAM and threshold
> > >    was set to absolute number.
> > > 
> > > BUG=843419
> > > 
> > > 
> > > Change-Id: Ib40a038d9d2f111a514b3f41ce7f32a3ea3a156d
> > > Reviewed-on: https://chromium-review.googlesource.com/1066804
> > > Commit-Queue: Siddhartha S <ssid@chromium.org>
> > > Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
> > > Cr-Commit-Position: refs/heads/master@{#560430}
> > 
> > TBR=bashi@chromium.org,ssid@chromium.org
> > 
> > Change-Id: I4b50e522dcc6c91542927a9e769e5eee24f486a5
> > No-Presubmit: true
> > No-Tree-Checks: true
> > No-Try: true
> > Bug: 843419
> > Reviewed-on: https://chromium-review.googlesource.com/1069567
> > Reviewed-by: enne <enne@chromium.org>
> > Commit-Queue: enne <enne@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#560761}
> 
> TBR=bashi@chromium.org,enne@chromium.org,ssid@chromium.org
> 
> Change-Id: I4d0a08cd44772dc690ac1d93b1d92b4934ed0373
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: 845411, 843419
> Reviewed-on: https://chromium-review.googlesource.com/1069888
> Reviewed-by: Siddhartha S <ssid@chromium.org>
> Commit-Queue: Siddhartha S <ssid@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#560882}

TBR=bashi@chromium.org,enne@chromium.org,ssid@chromium.org

Change-Id: Ib8841dddaa2a167e674c997ec1577036df26e8cb
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 845411, 843419
Reviewed-on: https://chromium-review.googlesource.com/1069876Reviewed-by: Siddhartha S <ssid@chromium.org>
Commit-Queue: Siddhartha S <ssid@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560889}

chrome/browser/android/oom_intervention/near_oom_monitor.cc

@@ -6,7 +6,6 @@
 
 #include "base/feature_list.h"
 #include "base/metrics/field_trial_params.h"
-#include "base/strings/string_number_conversions.h"
 #include "base/sys_info.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "chrome/common/chrome_features.h"
@@ -16,10 +15,6 @@ namespace {
 
 const char kSwapFreeThresholdRatioParamName[] = "swap_free_threshold_ratio";
 const char kUseComponentCallbacks[] = "use_component_callbacks";
-const char kRendererWorkloadThresholdDeprecated[] =
-    "renderer_workload_threshold";
-const char kRendererWorkloadThresholdPercentage[] =
-    "renderer_workload_threshold_percentage";
 
 // Default SwapFree/SwapTotal ratio for detecting near-OOM situation.
 // TODO(bashi): Confirm that this is appropriate.
@@ -33,36 +28,14 @@ constexpr base::TimeDelta kDefaultMonitoringDelta =
 constexpr base::TimeDelta kDefaultCooldownDelta =
     base::TimeDelta::FromSeconds(30);
 
-uint64_t GetRendererMemoryWorkloadThreshold() {
-  // Approximately 80MB for 512MB devices.
-  const uint64_t kDefaultMemoryWorkloadThresholdPercent = 16;
-
-  std::string threshold_str = base::GetFieldTrialParamValueByFeature(
-      features::kOomIntervention, kRendererWorkloadThresholdPercentage);
-  uint64_t threshold = 0;
-  size_t ram_size = base::SysInfo::AmountOfPhysicalMemory();
-  if (base::StringToUint64(threshold_str, &threshold)) {
-    return threshold * ram_size / 100;
-  }
-
-  // If the old trigger param is set, then enable intervention only on 512MB
-  // devices.
-  threshold_str = base::GetFieldTrialParamValueByFeature(
-      features::kOomIntervention, kRendererWorkloadThresholdDeprecated);
-  if (base::StringToUint64(threshold_str, &threshold)) {
-    if (ram_size > 512 * 1024 * 1024)
-      return 0;
-    return threshold;
-  }
-  return kDefaultMemoryWorkloadThresholdPercent * ram_size / 100;
-}
-
 }  // namespace
 
 // static
 NearOomMonitor* NearOomMonitor::Create() {
   if (!base::FeatureList::IsEnabled(features::kOomIntervention))
     return nullptr;
+  if (!base::SysInfo::IsLowEndDevice())
+    return nullptr;
 
   base::SystemMemoryInfoKB memory_info;
   if (!base::GetSystemMemoryInfo(&memory_info))
@@ -78,12 +51,8 @@ NearOomMonitor* NearOomMonitor::Create() {
       kDefaultSwapFreeThresholdRatio);
   int64_t swapfree_threshold =
       static_cast<int64_t>(memory_info.swap_total * threshold_ratio);
-
-  uint64_t renderer_workload_threshold = GetRendererMemoryWorkloadThreshold();
-  if (!renderer_workload_threshold)
-    return nullptr;
   return new NearOomMonitor(base::ThreadTaskRunnerHandle::Get(),
-                            swapfree_threshold, renderer_workload_threshold);
+                            swapfree_threshold);
 }
 
 // static
@@ -94,15 +63,13 @@ NearOomMonitor* NearOomMonitor::GetInstance() {
 
 NearOomMonitor::NearOomMonitor(
     scoped_refptr<base::SequencedTaskRunner> task_runner,
-    int64_t swapfree_threshold,
-    uint64_t renderer_workload_threshold)
+    int64_t swapfree_threshold)
     : task_runner_(task_runner),
       check_callback_(
           base::Bind(&NearOomMonitor::Check, base::Unretained(this))),
       monitoring_interval_(kDefaultMonitoringDelta),
       cooldown_interval_(kDefaultCooldownDelta),
       swapfree_threshold_(swapfree_threshold),
-      renderer_workload_threshold_(renderer_workload_threshold),
       component_callback_is_enabled_(
           base::GetFieldTrialParamByFeatureAsBool(features::kOomIntervention,
                                                   kUseComponentCallbacks,

chrome/browser/android/oom_intervention/near_oom_monitor.h

@@ -39,16 +39,11 @@ class NearOomMonitor {
   void OnLowMemory(JNIEnv* env,
                    const base::android::JavaParamRef<jobject>& jcaller);
 
-  uint64_t renderer_workload_threshold() const {
-    return renderer_workload_threshold_;
-  }
-
  protected:
   static NearOomMonitor* Create();
 
   NearOomMonitor(scoped_refptr<base::SequencedTaskRunner> task_runner,
-                 int64_t swapfree_threshold,
-                 uint64_t renderer_workload_threshold);
+                 int64_t swapfree_threshold);
 
   // Gets system memory info. This is a virtual method so that we can override
   // this for testing.
@@ -77,7 +72,6 @@ class NearOomMonitor {
   base::TimeTicks next_check_time_;
 
   int64_t swapfree_threshold_;
-  uint64_t renderer_workload_threshold_;
 
   CallbackList callbacks_;
 

chrome/browser/android/oom_intervention/near_oom_monitor_unittest.cc

@@ -12,16 +12,13 @@
 namespace {
 const int64_t kTestSwapTotalKB = 128 * 1024;
 const int64_t kTestSwapFreeThreshold = kTestSwapTotalKB / 4;
-const uint64_t kRendererWorkloadThreshold = 10 * 1024;
 }  // namespace
 
 class MockNearOomMonitor : public NearOomMonitor {
  public:
   explicit MockNearOomMonitor(
       scoped_refptr<base::SequencedTaskRunner> task_runner)
-      : NearOomMonitor(task_runner,
-                       kTestSwapFreeThreshold,
-                       kRendererWorkloadThreshold) {
+      : NearOomMonitor(task_runner, kTestSwapFreeThreshold) {
     // Start with 128MB swap total and 64MB swap free.
     memory_info_.swap_total = kTestSwapTotalKB;
     memory_info_.swap_free = kTestSwapTotalKB / 2;

chrome/browser/android/oom_intervention/oom_intervention_tab_helper.cc

@@ -61,6 +61,7 @@ void RecordInterventionStateOnCrash(bool accepted) {
 // Field trial parameter names.
 const char kRendererPauseParamName[] = "pause_renderer";
 const char kShouldDetectInRenderer[] = "detect_in_renderer";
+const char kRendererWorkloadThreshold[] = "renderer_workload_threshold";
 
 bool RendererPauseIsEnabled() {
   static bool enabled = base::GetFieldTrialParamByFeatureAsBool(
@@ -74,6 +75,18 @@ bool ShouldDetectInRenderer() {
   return enabled;
 }
 
+uint64_t GetRendererMemoryWorkloadThreshold() {
+  const uint64_t kDefaultMemoryWorkloadThreshold = 80 * 1024 * 1024;
+
+  std::string threshold_str = base::GetFieldTrialParamValueByFeature(
+      features::kOomIntervention, kRendererWorkloadThreshold);
+  uint64_t threshold = 0;
+  if (!base::StringToUint64(threshold_str, &threshold)) {
+    return kDefaultMemoryWorkloadThreshold;
+  }
+  return threshold;
+}
+
 }  // namespace
 
 // static
@@ -87,8 +100,7 @@ OomInterventionTabHelper::OomInterventionTabHelper(
       decider_(OomInterventionDecider::GetForBrowserContext(
           web_contents->GetBrowserContext())),
       binding_(this),
-      renderer_memory_workload_threshold_(
-          NearOomMonitor::GetInstance()->renderer_workload_threshold()),
+      renderer_memory_workload_threshold_(GetRendererMemoryWorkloadThreshold()),
       weak_ptr_factory_(this) {
   OutOfMemoryReporter::FromWebContents(web_contents)->AddObserver(this);
   shared_metrics_buffer_ = base::UnsafeSharedMemoryRegion::Create(