Improve warning message in reusable_pool.h

PiperOrigin-RevId: 682307063

mediapipe/gpu/BUILD

@@ -765,6 +765,7 @@ cc_library(
         "@com_google_absl//absl/functional:any_invocable",
         "@com_google_absl//absl/log:absl_log",
         "@com_google_absl//absl/status:statusor",
+        "@com_google_absl//absl/strings:str_format",
         "@com_google_absl//absl/synchronization",
     ],
 )

mediapipe/gpu/reusable_pool.h

@@ -28,6 +28,7 @@
 #include "absl/functional/any_invocable.h"
 #include "absl/log/absl_log.h"
 #include "absl/status/statusor.h"
+#include "absl/strings/str_format.h"
 #include "absl/synchronization/mutex.h"
 #include "mediapipe/framework/port/ret_check.h"
 #include "mediapipe/framework/port/status_macros.h"
@@ -141,9 +142,13 @@ void ReusablePool<Item>::TrimAvailable(
     std::vector<std::unique_ptr<Item>>* trimmed) {
   size_t keep = std::max(keep_count_ - in_use_count_, 0);
   if (available_.size() > keep) {
-    ABSL_LOG_FIRST_N(WARNING, 1)
-        << "Maximum number of pooled buffers reached. Consider increasing "
-           "MultiPoolOptions.keep_count";
+    ABSL_LOG_FIRST_N(WARNING, 1) << absl::StrFormat(
+        "Maximum number of pooled buffers reached (set to keep at most %d "
+        "buffers of the same type and size). MP buffer allocation patterns can "
+        "be observed with Perfetto by inspecting the "
+        "PerfettoScopedMemoryObjectCounters-based GpuBuffer and AhwbBuffer "
+        "counters. Then consider adjusting the MultiPoolOptions.keep_count",
+        keep_count_);
     auto trim_it = std::next(available_.begin(), keep);
     if (trimmed) {
       std::move(trim_it, available_.end(), std::back_inserter(*trimmed));