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From: John Stultz <john.stultz@linaro.org>
To: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Android Kernel Team <kernel-team@android.com>,
	Robert Love <rlove@google.com>, Mel Gorman <mel@csn.ul.ie>,
	Hugh Dickins <hughd@google.com>,
	Dave Hansen <dave@linux.vnet.ibm.com>,
	Rik van Riel <riel@redhat.com>,
	Dave Chinner <david@fromorbit.com>, Neil Brown <neilb@suse.de>,
	Andrea Righi <andrea@betterlinux.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Subject: Re: [PATCH 1/3] Range tree implementation
Date: Wed, 25 Apr 2012 09:19:48 -0700	[thread overview]
Message-ID: <4F982424.9000603@linaro.org> (raw)
In-Reply-To: <CAO6Zf6Bn7dHoXj=MN2dG8JynvxoAYjNZq3NqC3tWzO115T6uhA@mail.gmail.com>

On 04/25/2012 05:16 AM, Dmitry Adamushko wrote:
> Hi John,
>
> range_tree_in_range_adjacent() is not used in your code, and it
> doesn't seem to be very useful in general case. range_tree_in_range()
> can do the same thing (and you use it that way in the 2nd patch) and
> is more flexible (can be paired with range_tree_next_in_range()). So I
> think it can be dropped altogether.

Agreed. I actually at one point meant to do this and forgot. Thanks for 
pointing it out!

> Now, I'm wondering whether it actually makes sense to make a dedicated
> interface out of the remaining bits.
>
> Almost everything is common rb_tree-handling code that can be found in
> any place where rb-trees are used (hard-coded for flexibility,
> performance or whatever other reasons). So my feeling is that it
> should not be different here.
>
Sorry, not sure I quite understand what you're suggesting. Are you 
saying it doesn't make sense to have a generic range tree 
implementation, since really its just a small shim over the rbtree 
code?  So instead range-tree users should just implment them 
themselves?  Or something else?

thanks
-john


  reply	other threads:[~2012-04-25 16:20 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-24 17:49 [PATCH 0/3] Volatile Ranges John Stultz
2012-04-24 17:49 ` [PATCH 1/3] Range tree implementation John Stultz
2012-04-24 19:14   ` Peter Zijlstra
2012-04-24 19:25     ` John Stultz
2012-04-24 19:33       ` Peter Zijlstra
2012-04-25 12:16   ` Dmitry Adamushko
2012-04-25 16:19     ` John Stultz [this message]
2012-04-26 10:00       ` Dmitry Adamushko
2012-04-27 19:34         ` John Stultz
2012-04-24 17:49 ` [PATCH 2/3] fadvise: Add _VOLATILE,_ISVOLATILE, and _NONVOLATILE flags John Stultz
2012-04-24 19:20   ` Peter Zijlstra
2012-04-24 19:50     ` John Stultz
2012-04-27  0:39   ` Dave Chinner
2012-04-27 15:25     ` Dave Hansen
2012-04-28  1:36       ` Dave Chinner
2012-04-30 21:07         ` John Stultz
2012-05-01  0:08           ` Dave Chinner
2012-05-01  0:46             ` John Stultz
2012-05-01  1:28               ` Dave Chinner
2012-04-27 19:14     ` John Stultz
2012-04-28  2:04       ` Dave Chinner
2012-04-30 19:40         ` John Stultz
2012-05-01  0:28           ` Dave Chinner
2012-05-01  1:15             ` John Stultz
2012-05-01  1:51               ` Dave Chinner
2012-04-24 17:49 ` [PATCH 3/3] [RFC] ashmem: Convert ashmem to use volatile ranges John Stultz
2012-04-24 19:21   ` Peter Zijlstra
2012-04-24 19:42     ` John Stultz

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