Messages in this thread | ![/](/images/icornerl.gif) | | Date | Thu, 07 Dec 2006 20:36:21 +1100 | From | Nick Piggin <> | Subject | Re: 2.6.19-rc5-mm1 progression |
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Peter Zijlstra wrote: > On Mon, 2006-12-04 at 21:32 -0600, Larry Finger wrote:
>>There are at least two patches in 2.6.19-rc5-mm2 that make my system much more responsive for >>interactive jobs. The one that has the majority of the effect is: >> >>radix-tree-rcu-lockless-readside.patch >> >>I have not been able to isolate the second patch, which has the lesser effect. All I can say is that >>it occurred before the above patch in patches/series. This patch was tested against 2.6.19 and fixed >>most of the problem on that version. > > > Curious... > > This patch introduces the direct pointer optimisation for single element > radix trees and makes the radix tree safe to read in a lock-less manner > which is not used -yet-. The only difference that that should have is > that the elements are freed using rcu callback instead of directly. > > /me puzzled how this has a large effect on interactivity. > > Nick?
I have already got the direct data optimisation upstream. It might be possible that it is some interaction with the extra rcu callbacks going off... I don't know :\
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