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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Build Python with frame pointers (-fno-omit-frame-pointer)","articleBody":"# Feature or enhancement\r\n\r\nI propose to build CPython with `-fno-omit-frame-pointer` and `-mno-omit-leaf-frame-pointer` on compilers that support these options, at least on Linux with GCC and clang on platforms that support perf trampoline (https://github.com/python/cpython/issues/96143).\r\n\r\n# Pitch\r\n\r\nThe feature is needed for https://github.com/python/cpython/issues/96143 \"Allow the linux perf profiler to see Python calls\". Otherwise perf won't be able to reconstruct the call frames and perf report output isn't helpful.\r\n\r\n# Previous discussion\r\n\r\nThe feature change proposal https://fedoraproject.org/wiki/Changes/fno-omit-frame-pointer explains the usefulness of frame pointers in great detail. Code without frame pointers can be slightly more efficient because it does not have to safe a register on function call and it can repurpose the register for other uses. The potential performance impact is discussed in the Fedora change proposal, too. tl;dr Fedora testing has not shown any significant impact.\r\n","author":{"url":"https://github.com/tiran","@type":"Person","name":"tiran"},"datePublished":"2022-08-22T14:24:29Z","url":"https://github.com/python/cpython/issues/96174"}