TabManager: Do not overkill when target memory to free is negative.

chrome/browser/memory/tab_manager_delegate_chromeos.cc

Index: chrome/browser/memory/tab_manager_delegate_chromeos.cc
diff --git a/chrome/browser/memory/tab_manager_delegate_chromeos.cc b/chrome/browser/memory/tab_manager_delegate_chromeos.cc
index 02ecbd66082c001cfadf4838dc00980d03710707..dbc66dc5b1c7890a2c157059468a1368d7953961 100644
--- a/chrome/browser/memory/tab_manager_delegate_chromeos.cc
+++ b/chrome/browser/memory/tab_manager_delegate_chromeos.cc
@@ -588,21 +588,23 @@ void TabManagerDelegate::LowMemoryKillImpl(
       GetSortedCandidates(tab_list, arc_processes);
 
   int target_memory_to_free_kb = mem_stat_->TargetMemoryToFreeKB();
-  bool killed_candidate = false;
 
   // Kill processes until the estimated amount of freed memory is sufficient to
   // bring the system memory back to a normal level.
   // The list is sorted by descending importance, so we go through the list
   // backwards.
   for (auto it = candidates.rbegin(); it != candidates.rend(); ++it) {
-    VLOG(3) << "Target memory to free: " << target_memory_to_free_kb << " KB";
+    MEMORY_LOG(ERROR) << "Target memory to free: " << target_memory_to_free_kb
+                      << " KB";
+    if (target_memory_to_free_kb <= 0)
+      break;
     // Never kill selected tab or Android foreground app, regardless whether
     // they're in the active window. Since the user experience would be bad.
     ProcessType process_type = it->process_type();
     if (process_type == ProcessType::VISIBLE_APP ||
         process_type == ProcessType::FOCUSED_APP ||
         process_type == ProcessType::FOCUSED_TAB) {
-      VLOG(2) << "Skipped killing " << *it;
+      MEMORY_LOG(ERROR) << "Skipped killing " << *it;
       continue;
     }
     if (it->app()) {
@@ -613,7 +615,8 @@ void TabManagerDelegate::LowMemoryKillImpl(
         MemoryKillsMonitor::LogLowMemoryKill("APP", estimated_memory_freed_kb);
         MEMORY_LOG(ERROR) << "Killed " << *it << ", estimated "
                           << estimated_memory_freed_kb << " KB freed";
-        killed_candidate = true;
+      } else {
+        MEMORY_LOG(ERROR) << "Failed to kill " << *it;
       }
     } else {
       int64_t tab_id = it->tab()->tab_contents_id;
@@ -627,16 +630,14 @@ void TabManagerDelegate::LowMemoryKillImpl(
         MemoryKillsMonitor::LogLowMemoryKill("TAB", estimated_memory_freed_kb);
         MEMORY_LOG(ERROR) << "Killed " << *it << ", estimated "
                           << estimated_memory_freed_kb << " KB freed";
-        killed_candidate = true;
+      } else {
+        MEMORY_LOG(ERROR) << "Failed to kill " << *it;
       }
     }
-    if (target_memory_to_free_kb < 0)
-      break;
   }
-  if (!killed_candidate) {
-    MEMORY_LOG(ERROR) << "Low memory: Unable to kill any candidates. "
-                      << "Attempted to free " << target_memory_to_free_kb
-                      << " KB";
+  if (target_memory_to_free_kb > 0) {
+    MEMORY_LOG(ERROR)
+        << "Unable to kill enough candidates to meet target_memory_to_free_kb ";
   }
 }