Messages in this thread | | | Date | Sat, 3 May 2008 13:16:27 -0400 | From | "Frank Ch. Eigler" <> | Subject | Re: preempt-rt, need old style rwlocks for systemtap |
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Hi -
On Sat, May 03, 2008 at 09:34:16AM -0500, Clark Williams wrote: > [...] > > It has come to my attention that the preempt-rt patch suite > > deliberately defeats the potential concurrency intended by systemtap's > > use of rwlocks to permit concurrent readers [...]
> The reason it "defeats" the concurrent behavior is that it's really > complicated to have concurrent readers with Priority Inheritance, so > the initial cut of rtmutexes serialized all lock accesses. [...]
Do you believe priority inheritance to be an essential property of every use of these primitives, regardless of the nature of the specifical critical sections being protected? Is there no way & need to opt out of the extra machinery?
- FChE
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