diff --git a/compiler-rt/lib/tsan/rtl/tsan_platform.h b/compiler-rt/lib/tsan/rtl/tsan_platform.h
--- a/compiler-rt/lib/tsan/rtl/tsan_platform.h
+++ b/compiler-rt/lib/tsan/rtl/tsan_platform.h
@@ -971,7 +971,7 @@
 void CheckAndProtect();
 void InitializeShadowMemoryPlatform();
 void FlushShadowMemory();
-void WriteMemoryProfile(char *buf, uptr buf_size);
+void WriteMemoryProfile(char *buf, uptr buf_size, u64 uptime_ns);
 int ExtractResolvFDs(void *state, int *fds, int nfd);
 int ExtractRecvmsgFDs(void *msg, int *fds, int nfd);
 uptr ExtractLongJmpSp(uptr *env);
diff --git a/compiler-rt/lib/tsan/rtl/tsan_platform_linux.cpp b/compiler-rt/lib/tsan/rtl/tsan_platform_linux.cpp
--- a/compiler-rt/lib/tsan/rtl/tsan_platform_linux.cpp
+++ b/compiler-rt/lib/tsan/rtl/tsan_platform_linux.cpp
@@ -119,7 +119,7 @@
     mem[MemOther] += rss;
 }
 
-void WriteMemoryProfile(char *buf, uptr buf_size) {
+void WriteMemoryProfile(char *buf, uptr buf_size, u64 uptime_ns) {
   uptr mem[MemCount];
   internal_memset(mem, 0, sizeof(mem));
   GetMemoryProfile(FillProfileCallback, mem, 7);
@@ -136,15 +136,15 @@
     mem[MemMmap] = 0;
   internal_snprintf(
       buf, buf_size,
-      "RSS %zd MB: shadow:%zd meta:%zd file:%zd mmap:%zd"
+      "%llus: RSS %zd MB: shadow:%zd meta:%zd file:%zd mmap:%zd"
       " trace:%zd heap:%zd other:%zd intalloc:%zd memblocks:%zd syncobj:%zu"
       " stacks=%zd[%zd] nthr=%zd/%zd\n",
-      mem[MemTotal] >> 20, mem[MemShadow] >> 20, mem[MemMeta] >> 20,
-      mem[MemFile] >> 20, mem[MemMmap] >> 20, mem[MemTrace] >> 20,
-      mem[MemHeap] >> 20, mem[MemOther] >> 20,
-      internal_stats[AllocatorStatMapped] >> 20, meta.mem_block >> 20,
-      meta.sync_obj >> 20, stacks->allocated >> 20, stacks->n_uniq_ids, nlive,
-      nthread);
+      uptime_ns / (1000 * 1000 * 1000), mem[MemTotal] >> 20,
+      mem[MemShadow] >> 20, mem[MemMeta] >> 20, mem[MemFile] >> 20,
+      mem[MemMmap] >> 20, mem[MemTrace] >> 20, mem[MemHeap] >> 20,
+      mem[MemOther] >> 20, internal_stats[AllocatorStatMapped] >> 20,
+      meta.mem_block >> 20, meta.sync_obj >> 20, stacks->allocated >> 20,
+      stacks->n_uniq_ids, nlive, nthread);
 }
 
 #  if SANITIZER_LINUX
diff --git a/compiler-rt/lib/tsan/rtl/tsan_platform_mac.cpp b/compiler-rt/lib/tsan/rtl/tsan_platform_mac.cpp
--- a/compiler-rt/lib/tsan/rtl/tsan_platform_mac.cpp
+++ b/compiler-rt/lib/tsan/rtl/tsan_platform_mac.cpp
@@ -139,7 +139,7 @@
   *dirty = dirty_pages * GetPageSizeCached();
 }
 
-void WriteMemoryProfile(char *buf, uptr buf_size) {
+void WriteMemoryProfile(char *buf, uptr buf_size, u64 uptime_ns) {
   uptr shadow_res, shadow_dirty;
   uptr meta_res, meta_dirty;
   uptr trace_res, trace_dirty;
diff --git a/compiler-rt/lib/tsan/rtl/tsan_platform_windows.cpp b/compiler-rt/lib/tsan/rtl/tsan_platform_windows.cpp
--- a/compiler-rt/lib/tsan/rtl/tsan_platform_windows.cpp
+++ b/compiler-rt/lib/tsan/rtl/tsan_platform_windows.cpp
@@ -23,7 +23,7 @@
 void FlushShadowMemory() {
 }
 
-void WriteMemoryProfile(char *buf, uptr buf_size) {}
+void WriteMemoryProfile(char *buf, uptr buf_size, u64 uptime_ns) {}
 
 void InitializePlatformEarly() {
 }
diff --git a/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp b/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp
--- a/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp
+++ b/compiler-rt/lib/tsan/rtl/tsan_rtl.cpp
@@ -149,11 +149,11 @@
 }
 
 #if !SANITIZER_GO
-void MemoryProfiler() {
+void MemoryProfiler(u64 uptime) {
   if (ctx->memprof_fd == kInvalidFd)
     return;
   InternalMmapVector<char> buf(4096);
-  WriteMemoryProfile(buf.data(), buf.size());
+  WriteMemoryProfile(buf.data(), buf.size(), uptime);
   WriteToFile(ctx->memprof_fd, buf.data(), internal_strlen(buf.data()));
 }
 
@@ -176,7 +176,7 @@
       return;
     }
   }
-  MemoryProfiler();
+  MemoryProfiler(0);
   MaybeSpawnBackgroundThread();
 }
 
@@ -188,6 +188,7 @@
   cur_thread_init();
   cur_thread()->ignore_interceptors++;
   const u64 kMs2Ns = 1000 * 1000;
+  const u64 start = NanoTime();
 
   u64 last_flush = NanoTime();
   uptr last_rss = 0;
@@ -220,7 +221,7 @@
       last_rss = rss;
     }
 
-    MemoryProfiler();
+    MemoryProfiler(now - start);
 
     // Flush symbolizer cache if requested.
     if (flags()->flush_symbolizer_ms > 0) {