Messages in this thread | | | Date | Thu, 9 May 2013 17:20:22 +0200 | From | Jiri Olsa <> | Subject | Re: [PATCH 0/9] perf: Adding better precise_ip field handling |
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On Thu, May 09, 2013 at 05:07:44PM +0200, Peter Zijlstra wrote: > On Thu, May 09, 2013 at 03:32:15PM +0200, Jiri Olsa wrote: > > hi, > > adding sysfs attribute to specify the maximum allowed value > > for perf_event_attr::precise_ip field. > > > > Adding functionality for simple 'p' modifier and 'precise' term > > to get the maximum allowed value for perf_event_attr::precise_ip > > field. > > > > You've seem to lost the part explaining why we want this.. :-)
well, initially it was an answer when we broke precise event monitoring in kernel so I wrote automated test for it (patches 1,2,3) https://lkml.org/lkml/2012/12/12/561
having maximum precise enabled with just single 'p' seemed like good idea
next step would be to enable precise automatically for 'cycles' (when PEBS is working) asked for by Ingo http://marc.info/?l=linux-kernel&m=135929050803963&w=2
jirka
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