up

Author: maurycy

Misc/NEWS.d/next/Library/2026-10-10-13-35-08.gh-issue-149584.Yq2bF7.rst

@@ -0,0 +1,2 @@
+Improve the performance of the Tachyon profiler by avoiding unnecessary remote
+reads of the base frame sentinel. Patch by Maurycy Pawłowski-Wieroński.

Modules/_remote_debugging/frames.c

@@ -326,6 +326,11 @@ process_frame_chain(
         }
         assert(frame_count <= MAX_FRAME_CHAIN_DEPTH);
 
+        if (frame_addr == ctx->base_frame_addr
+                && !(unwinder->gc && frame_addr == ctx->gc_frame)) {
+            break;
+        }
+
         if (ctx->chunks && ctx->chunks->count > 0) {
             parse_result = parse_frame_from_chunks(
                 unwinder, &frame, frame_addr, &next_frame_addr, &stackpointer, ctx->chunks);