On Wed, Feb 15, 2012 at 12:06 AM, Vimal <[email protected]> wrote: > Hi all, > > Is there a way to set the affinity of hrtimer callback, so that it > executes on a particular logical CPU? >
> The reason is that I have a hrtimer callback that executes a tasklet. If the timer callback executes on a different CPU than the one it was > enqueued in, then the tasklet is scheduled on the same CPU, which > makes it difficult to reason serialising locks to per-CPU data > How about this: http://www.makelinux.net/ldd3/chp-7-sect-5 Tasklet is executed and scheduled on a particular known cpu, so unless u spawn another tasklet that execute on the other CPU, u don't need per-CPU data structure - simply because there is no another CPU to contend with the data structure. Not sure if I got the point? I am not sure why u need to synchronize stuff "between CPU", as a particular tasklet is only executed on only one CPU at a time: I suspect what u wanted is a "task". A tasklet is effectively a "bottom half" and u are holding a spinlock while executing it, and thus it really has to be very fast. Read this paper: http://www.wil.cx/matthew/lca2003/paper.pdf structures. > > Any ideas? > > Thanks, > -- > Vimal > > _______________________________________________ > Kernelnewbies mailing list > [email protected] > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > -- Regards, Peter Teoh
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