On Tue, Sep 16, 2014 at 03:14:01PM +0900, Tejun Heo wrote: > I don't think marking config options as "UNDER DEVELOPMENT" in its > help documentation means anything. It's a rather silly thing to do. > Not many people pay much attention to the help texts and once somebody > somewhere enabled the option for a distro, it's as free in the wild as > any other kernel feature and CONFIG_MEMCG_KMEM is enabled by a lot of > distros. The same goes with the "debug" controller. It doesn't mean > much that it has "debug" in its name. Once it's out in the wild, > there will be someone making use of it in some weird way. > > If a debug feature has to be in the mainline kernel, the fact that > it's a debug feature must be explicitly chosen in each use. IOW, gate > it by an unwieldy boot param which makes it painfully clear that it's > enabling an unstable debug feature and print out a loud warning > message about it. > > As it currently stands, CONFIG_MEMCG_KMEM is as good as any other > enabled kernel option. The help text saying that it's experimental > does not mean anything especially when it doesn't even depend on > CONFIG_BROKEN. > > So, the argument "the option was explained as experimental in help > text" doesn't fly at all. We can still try to deprecate it gradually > if the cleanup seems worthwhile; however, with v2 interface pending, > I'm not sure how meaningful that'd be. We'd have to carry quite a bit > of v1 code around anyway and I'd like to keep v1 interface as static > as possible. No reason to shake that at this point. Fair enough, thank you for the clarification. I hope we'll be able to get rid of it in a year or two when cgroup v2 becomes stable. Thanks, Vladimir -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>