On Wed, 21 Aug 2013, Thorsten Glaser wrote: > >> Anything GTK+/GNOME (e.g. xchat) is not usable due to their use of > >> TLS and/or atomics. I had thought KDE would suffer from the same, but > >> they seem to be faster? > > > >We do have TLS now, don't we? > > Yes, that precisely is the problem. > > We *must* break the ABI, put aside an A register for the TLS thread > base, and do something about the syscall overhead for things like > atomic_cmpxchg, gettimeofday, etc. too, like shared kernel/user pages.
Losing a register also hurts performance. Someone suggested moving get/set_thread_area to a VDSO (as well as the atomic ops). As I understand it, this need not break the ABI and should be faster than the TLS system calls. Finn -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
