On Monday 29 June 2009 17:31:18 ext Jean Pihet wrote: > Hi, > > I am trying to get the latest IRQ registers from a timer or a work queue > but I am running into problems: > - get_irq_regs() returns NULL in some cases, so it is unsuable and even > causes crash when trying to get the registers values from the returned ptr > - I never get user space registers, only kernel > > The use case is that the performance unit (PMNC) of the Cortex A8 has some > serious bug, in short the performance counters overflow IRQ is to be > avoided. The solution I am implementing is to read and reset the counters > from a work queue that is triggered by a timer.
Regarding this oprofile related part. I wonder how you can get oprofile working properly (providing non-bogus results) without performance counters overflow IRQ generation? Are you trying to implement (in a clean way) something similar to http://marc.info/?l=oprofile-list&m=123688347009580&w=2 Or is it going to be a different workaround? -- Best regards, Siarhei Siamashka -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
