On Sat, 2014-02-08 at 13:06 -0800, Andy Lutomirski wrote: > This toggles TIF_SYSCALL_AUDIT as needed when rules change instead > of leaving it set whenever rules might be set in the future. This > reduces syscall latency from >60ns to closer to 40ns on my laptop.
Al also politely reminded me it might be wise to get some perf data about where exactly we are spending out time. I don't know squat about perf, but Linus always tells me to do: perf record -g -e cycles:pp -F 25000 $YOURTEST perf report -s symbol (the "-s symbol" is so that you don't get separate data for the different processes that are part of the kernel build - you'll just want "general kernel data"), and on one of the kernel symbols just select it and do "Zoom into kernel DSO". You should see something like this: -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
