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mbs wrote: > > the way I handled this was that the timerid was the (kernel space) address of > the dynamically allocated timer structure. this provides a fairly low > likelyhood of duplicate timerid's value.... Yes, but this is a VERY messy pointer which must be verified to not cause a kernel fault before it can even be dereferenced... nuff said. -g by the way, the address mbs@mc.com fails. Maybe you could use something I can mail to. > > On Wednesday 23 October 2002 15:48, Jim Houston wrote: > > george anzinger wrote: > > > Jim Houston wrote: > > > I have also looked at the timer index stuff and made a few > > > changes. If it get it working today, I will include it > > > also. My changes mostly revolved around not caring about > > > reusing a timer id. Would you care to comment on why you > > > think reuse is bad? > > > > > > With out this feature the code is much simpler and does not > > > keep around dead trees. > > > > > > -g > > > > Hi George, > > > > I assume the rationale is that not reusing the same id immediately helps > > catch errors in user code. Since the id space is global, there > > is more chance that one process may be manipulating another processes > > timer. Reusing the same id makes this sort of problem harder to > > catch. > > > > The main reason I changed this in my patch is to avoid the CONFIG > > limit on the number of timers. Since I don't have the fixed array, > > I need a way to safely translate a user-space id into a kernel pointer. > > > > Jim Houston Concurrent Computer Corp. > > - > > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > Please read the FAQ at http://www.tux.org/lkml/ > > -- > /************************************************** > ** Mark Salisbury || mbs@mc.com ** > ** If you would like to sponsor me for the ** > ** Mass Getaway, a 150 mile bicycle ride to for ** > ** MS, contact me to donate by cash or check or ** > ** click the link below to donate by credit card ** > **************************************************/ > https://www.nationalmssociety.org/pledge/pledge.asp?participantid=86736 -- George Anzinger george@mvista.com High-res-timers: http://sourceforge.net/projects/high-res-timers/ Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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