[scudo] Dump ReleaseToOsIntervalMs (#86887)

This can be adjusted during runtime and it may impact the memory
footprint if it's set to a big value or is disabled.

Author: ChiaHungDuan

compiler-rt/lib/scudo/standalone/primary64.h

@@ -372,10 +372,11 @@ template <typename Config> class SizeClassAllocator64 {
         PushedBlocks += Region->FreeListInfo.PushedBlocks;
       }
     }
+    const s32 IntervalMs = atomic_load_relaxed(&ReleaseToOsIntervalMs);
     Str->append("Stats: SizeClassAllocator64: %zuM mapped (%uM rss) in %zu "
-                "allocations; remains %zu\n",
+                "allocations; remains %zu; ReleaseToOsIntervalMs = %d\n",
                 TotalMapped >> 20, 0U, PoppedBlocks,
-                PoppedBlocks - PushedBlocks);
+                PoppedBlocks - PushedBlocks, IntervalMs >= 0 ? IntervalMs : -1);
 
     for (uptr I = 0; I < NumClasses; I++) {
       RegionInfo *Region = getRegionInfo(I);

compiler-rt/lib/scudo/standalone/secondary.h

@@ -179,10 +179,12 @@ template <typename Config> class MapAllocatorCache {
     uptr Fractional;
     computePercentage(SuccessfulRetrieves, CallsToRetrieve, &Integral,
                       &Fractional);
-    Str->append("Stats: MapAllocatorCache: EntriesCount: %d, "
-                "MaxEntriesCount: %u, MaxEntrySize: %zu\n",
-                EntriesCount, atomic_load_relaxed(&MaxEntriesCount),
-                atomic_load_relaxed(&MaxEntrySize));
+    const s32 Interval = atomic_load_relaxed(&ReleaseToOsIntervalMs);
+    Str->append(
+        "Stats: MapAllocatorCache: EntriesCount: %d, "
+        "MaxEntriesCount: %u, MaxEntrySize: %zu, ReleaseToOsIntervalMs = %d\n",
+        EntriesCount, atomic_load_relaxed(&MaxEntriesCount),
+        atomic_load_relaxed(&MaxEntrySize), Interval >= 0 ? Interval : -1);
     Str->append("Stats: CacheRetrievalStats: SuccessRate: %u/%u "
                 "(%zu.%02zu%%)\n",
                 SuccessfulRetrieves, CallsToRetrieve, Integral, Fractional);