Messages in this thread | | | Date | Wed, 3 Oct 2012 13:05:38 -0700 | From | "Paul E. McKenney" <> | Subject | Re: [PATCH] make CONFIG_EXPERIMENTAL invisible and default |
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On Wed, Oct 03, 2012 at 03:36:53PM -0400, Dave Jones wrote: > On Wed, Oct 03, 2012 at 07:46:18PM +0200, Frederic Weisbecker wrote: > > > it in the kernel tree, unless we wanted people to use the option? > > > > A solution could be to add that option under CONFIG_DEBUG_KERNEL and specify > > that it must only be enabled by developers for specific reasons (overhead, > > security). CONFIG_PROVE_LOCKING falls into that category, right? > > > > We have CONFIG_RCU_USER_QS that is a specific case. It's an intermediate state > > before we implement a true CONFIG_NO_HZ_FULL. But the option is useless on its > > own for users. Worse, it introduces a real overhead. OTOH we want it to be upstream > > to make the development of full tickless feature more incremental. > > > > Perhaps we should put that under CONFIG_DEBUG_KERNEL. > > Overloading an existing config option for something unrelated seems unpleasant to me. > It will only take a few people to start doing this, before it turns into a landslide > where everyone ends up with DEBUG_KERNEL set. > And what of people who already have DEBUG_KERNEL set ? > > Just state what you wrote above in the kconfig. > Currently, RCU_USER_QS says nothing about the fact that it's work in progress.
Fair point!
> The missing part that I don't have an answer for however, is what happens > when you deem this production ready? Distro maintainers won't notice the > kconfig text changing. But perhaps that's a good thing, and will lead to things > only being enabled when people explicitly ask for them in distros. > > Alternatively, if you really do want to go the path of a new config option, > perhaps CONFIG_NOT_DISTRO_READY would spell things out more clearly. > EXPERIMENTAL is such a wasteland it would take too much manpower to audit > every case, and update accordingly, but scorching the earth and starting > afresh might be feasible.
Heh! We might just plan to scorch the earth and start afresh every few years. That might actually work... ;-)
Thanx, Paul
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