RE: lockref scalability on x86-64 vs cpu_relax
From: "Luck, Tony" <tony.luck@intel.com>
Date: 2023-01-13 00:31:19
Also in:
linux-arch, linux-fsdevel, linuxppc-dev
Yeah, if it was ia64-only, it's a non-issue these days. It's dead and in pure maintenance mode from a kernel perspective (if even that).
There's not much "simultaneous" in the SMT on ia64. One thread in a spin loop will hog the core until the h/w switches to the other thread some number of cycles (hundreds, thousands? I really can remember). So I was pretty generous with dropping cpu_relax() into any kind of spin loop. Is it time yet for: $ git rm -r arch/ia64 -Tony _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel