On 10/2/2011 4:44 AM, Gilad Ben-Yossef wrote: >> We have some code in our tree (not yet >> returned to the community) that tries to deal with some sources of interrupt >> jitter on tiles that are running isolcpu and want to be 100% in user space. > Yes, I think this work will benefit this kind of use case (CPU/user > space bound on a dedicated CPU) > the most, although other use cases can benefit as well (e.g. power > management with idle cores). > > Btw, do you have any plan to share the patches you mentioned? it could > save me a lot of time. Not wanting to > re-invent the wheel and all that... I'd like to, but getting the patch put together cleanly is still on my list behind a number of other things (glibc community return, kernel catch-up with a backlog of less controversial changes, customer crises, enhancements targeted to forthcoming releases, etc.; I'm sure you know the drill...) >>> This first version creates an on_each_cpu_mask infrastructure API (derived >>> from >>> existing arch specific versions in Tile and Arm) and uses it to turn two >>> global >>> IPI invocation to per CPU group invocations. >> The global version looks fine; I would probably make on_each_cpu() an inline >> in the !SMP case now that you are (correctly, I suspect) disabling >> interrupts when calling the function. >> > Good point. Will do. > > I will take this email as an ACK to the tile relevant changes, if that > is OK with you. Yes, definitely. Acked-by: Chris Metcalf <cmetcalf@xxxxxxxxxx> -- Chris Metcalf, Tilera Corp. http://www.tilera.com -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>