Source: glibc Severity: wishlist Hi,
When profiling with perf (and even oprofile) showing the call graph can often be invaluable. Unfortunately for anything that goes through libc that's not efficiently possible as glibc (on at least amd64) doesn't build with frame pointers enabled. It is possible to use dwarf unwinding with halfway modern kernel/perf combinations to get call graphs even in that case, but the overhead is about a magnitude higher and the profiles are much larger. As applications have to be built with -fno-omit-frame-pointers anyway to provide usable call stack it's usually not a problem if some library isn't. But as so many things that often are bottlenecks (syscalls, memcpy, string operations, locking, ...) goes through libc it'd be quite valuable to have a variant of libc built with frame pointers enabled. Thanks for considering, Andres -- System Information: Debian Release: jessie/sid APT prefers unstable APT policy: (500, 'unstable'), (1, 'experimental') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 3.17.0-andres-09670-g0429fbc (SMP w/8 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
