|From:||Andrew Morton <akpm-AT-linux-foundation.org>|
|To:||Dan Magenheimer <dan.magenheimer-AT-oracle.com>|
|Subject:||Re: [GIT PULL] mm: frontswap (for 3.2 window)|
|Date:||Tue, 1 Nov 2011 14:43:09 -0700|
|Cc:||KAMEZAWA Hiroyuki <kamezawa.hiroyu-AT-jp.fujitsu.com>, Linus Torvalds <torvalds-AT-linux-foundation.org>, linux-mm-AT-kvack.org, LKML <linux-kernel-AT-vger.kernel.org>, Konrad Wilk <konrad.wilk-AT-oracle.com>, Jeremy Fitzhardinge <jeremy-AT-goop.org>, Seth Jennings <sjenning-AT-linux.vnet.ibm.com>, ngupta-AT-vflare.org, levinsasha928-AT-gmail.com, Chris Mason <chris.mason-AT-oracle.com>, JBeulich-AT-novell.com, Dave Hansen <dave-AT-linux.vnet.ibm.com>, Jonathan Corbet <corbet-AT-lwn.net>, Neo Jia <cyclonusj-AT-gmail.com>|
On Tue, 1 Nov 2011 08:25:38 -0700 (PDT) Dan Magenheimer <firstname.lastname@example.org> wrote: > OK, I will then coordinate with sfr to remove it from the linux-next > tree when (if?) akpm puts the patchset into the -mm tree. No, that's not necessary. The current process (you maintain git tree, it gets included in -next, later gets pulled by Linus) is good. The only reason I see for putting such code through -mm would be if there were significant interactions with other core MM work. It doesn't matter which route is taken, as long as the code is appropriately reviewed and tested. > But > since very few linux-mm experts had responded to previous postings > of the frontswap patchset, I am glad to have a much wider audience > to discuss it now because of the lkml git-pull request. At kernel summit there was discussion and overall agreement that we've been paying insufficient attention to the big-picture "should we include this feature at all" issues. We resolved to look more intensely and critically at new features with a view to deciding whether their usefulness justified their maintenance burden. It seems that you're our crash-test dummy ;) (Now I'm wondering how to get "cgroups: add a task counter subsystem" put through the same wringer). I will confess to and apologise for dropping the ball on cleancache and frontswap. I was never really able to convince myself that it met the (very vague) cost/benefit test, but nor was I able to present convincing arguments that it failed that test. So I very badly went into hiding, to wait and see what happened. What we needed all those months ago was to have the discussion we're having now. This is a difficult discussion and a difficult decision. But it is important that we get it right. Thanks for you patience. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to email@example.com. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"firstname.lastname@example.org"> email@example.com </a>
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