Messages in this thread | | | Date | Fri, 10 Jan 2014 10:36:35 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH 2/3] perf: clarify comment regarding event merging |
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On Thu, Jan 09, 2014 at 03:51:31PM -0800, Cody P Schafer wrote: > There are actually 2 things about software events that allow us to > merge them: they never fail to schedule _and_ they have transaction > handlers we can (and do, when they are added to !sw groups) ignore. Note > both of these in the comment on adding sw events to !sw groups.
The latter is a direct consequence of the former. Since they can always be scheduled, they don't need any schedulability testing, and therefore the transaction stuff is useless.
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