Hi Peter, > -----Original Message----- > From: Peter Zijlstra [mailto:[email protected]] > Sent: 19 августа 2015 г. 2:37 > To: Alexey Brodkin > Cc: [email protected]; [email protected]; > [email protected]; [email protected]; > [email protected]; Arnaldo Carvalho de Melo > Subject: Re: [PATCH v2 6/8] ARCv2: perf: implement exclusion of event > counting in user or kernel mode > > On Wed, Aug 05, 2015 at 06:13:32PM +0300, Alexey Brodkin wrote: > > + hwc->config = 0; > > + > > + if (is_isa_arcv2()) { > > + /* "exclude user" means "count only kernel" */ > > + if (event->attr.exclude_user) > > + hwc->config |= ARC_REG_PCT_CONFIG_KERN; > > + > > + /* "exclude kernel" means "count only user" */ > > + if (event->attr.exclude_kernel) > > + hwc->config |= ARC_REG_PCT_CONFIG_USER; > > + } > > + > > switch (event->attr.type) { > > case PERF_TYPE_HARDWARE: > > if (event->attr.config >= PERF_COUNT_HW_MAX) > > return -ENOENT; > > if (arc_pmu->ev_hw_idx[event->attr.config] < 0) > > return -ENOENT; > > - hwc->config = arc_pmu->ev_hw_idx[event->attr.config]; > > + hwc->config |= arc_pmu->ev_hw_idx[event->attr.config]; > > So I would still very much like perf_event_attr::config to reflect the > value you'll program into hardware. > > If you want to do that weird 4 character lookup thing, use a special > hardware event (possibly 0 if that is not a valid value), and stuff the > 4 chars in ::config1
Ok I understand your concern here but I cannot quite understand what do you mean saying "stuff the 4 chars in ::config1". Could you please explain this a bit more verbose? Is there an example of something similar I may take a look at? -Alexey -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
