On Wed, 14 Jan 2009 20:00:08 +0100 Ingo Molnar <mi...@elte.hu> wrote:
> > * Andrew Morton <a...@linux-foundation.org> wrote: > > > On Wed, 14 Jan 2009 19:33:19 +0100 Ingo Molnar <mi...@elte.hu> 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. Do people enable CONFIG_SCHED_DEBUG? CONFIG_DEBUG_MUTEXES=n, CONFIG_SCHED_DEBUG=y is getting to be a pretty small subset? -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
