[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.

GitOrigin-RevId: 6b149f70abc2d0214cc29e7a2aeea428d3719491
Change-Id: I8e18f40c2a6df8e2ba8764011846a7eff08010cb

2 files changed, 9 insertions, 6 deletions

diff --git a/standalone/primary64.h b/standalone/primary64.h
index f5e4ab57b4d..abce4bff321 100644
--- a/standalone/primary64.h
+++ b/standalone/primary64.h
@@ -372,10 +372,11 @@ public:
         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);
diff --git a/standalone/secondary.h b/standalone/secondary.h
index 202c55cc1a9..674af507177 100644
--- a/standalone/secondary.h
+++ b/standalone/secondary.h
@@ -179,10 +179,12 @@ public:
     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);