On Tue, 9 Aug 2016 15:28:57 -0300 Daniel Bristot de Oliveira <bristot@xxxxxxxxxx> wrote: > On 08/09/2016 03:05 PM, Steven Rostedt wrote: > > If an arch supports counting of SMIs (like newer intel chips do), then it > > can implement arch_smi_count() to return the number of SMIs that were > > triggered. The hwlat detector will call this function to get the current > > number of SMIs, and then after a period, it will read that function again, > > and if there's a difference, it will record that into the sample. > > > > For example: > > > > [99] inner:13 outer:16 ts:1470352534.886878855 > > [100] inner:14 outer:18747 ts:1470352538.917966818 smi-count:2 > > [101] inner:0 outer:19162 ts:1470352539.920988709 smi-count:6 > > [102] inner:19376 outer:19276 ts:1470352540.923010578 smi-count:6 > > [103] inner:19650 outer:20665 ts:1470352541.926032469 smi-count:6 > > [104] inner:20526 outer:20680 ts:1470352542.973055312 smi-count:6 > > [105] inner:17 outer:17 ts:1470352543.990077507 > > > > Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx> > > It worked fine in a system that I can manually cause SMIs (by turning > keyboard's backlight on and off). > > Tested-by: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx> Thanks! I should also add: Suggested-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx> As Peter was the one that recommended adding the arch_smi_count() function. But I can't push this yet as this would require acks from the x86 maintainers. But if there's no complaints about the rest of the patches, I could work to get that ready. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
