* Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > On Wed, 14 Jan 2009 19:33:19 +0100 Ingo Molnar <mingo@xxxxxxx> wrote: > > > Please pull the adaptive-mutexes-for-linus git tree > > <fear> > > - It seems a major shortcoming that the feature is disabled if > CONFIG_DEBUG_MUTEXES=y. It means that lots of people won't test it. > > - When people hit performance/latency oddities, it would be nice if > they had a /proc knob with which they could disable this feature at > runtime. > > This would also be useful for comparative performance testing. Yeah. From my other mail: > > We still have the /sys/debug/sched_features tunable under > > CONFIG_SCHED_DEBUG=y, so should this cause any performance regressions > > somewhere, it can be pinned down and blamed back on this change > > easily, without bisection and without rebooting the box. This kind of easy knob was included early on - this is how all those spin versus no-spin numbers were done. Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
