On Thu, Dec 11 2025 at 10:52, Kevin Brodsky wrote: > On 11/12/2025 07:55, Thomas Gleixner wrote: >> I have a suspicion that it is TIF_NOTIFY_RESUME. If that's the case >> you're seing the RSEQ overhead, which should be completely gone with the >> rewrite that got just merged into Linus tree. > > I don't think this is related. This patch inlines syscall_exit_work(), > which is called if some flag in SYSCALL_WORK_EXIT is set. This includes > syscall-specific stuff like tracing and singlestep. TIF_NOTIFY_RESUME is > part of EXIT_TO_USER_MODE_WORK, handled in exit_to_user_mode_prepare(), > and isn't specific to syscall handling.
Indeed. Confused myself.
