On 11/10/22 08:59, Michael Catanzaro wrote: > On Wed, Nov 9 2022 at 09:39:04 AM +0100, Vitaly Zaitsev via devel > <devel@lists.fedoraproject.org> wrote: >> According to tests, this will slow down your system to 2.5%+, which is >> unacceptable for a general purpose distribution. > > Of course, without the frame pointers, profiling software is impossible > and performance engineers are unable to investigate performance > problems using Fedora. Seems kind of silly to block performance work > just for a 2.5% benefit.... > > Michael
Have you considered submitting kernel patches for DWARF unwinding? The actual unwinding can be done in the vdso, so bugs do not crash the kernel. That eliminates the main reason for Linus’s objection IIUC. It does mean that user stack unwinding needs to move from NMI context to just before system call return, but that is a good thing anyway as it allows faulting in stack pages if needed. -- Sincerely, Demi Marie Obenour (she/her/hers) _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
