Messages in this thread | | | Date | Thu, 12 May 2016 10:05:16 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH 02/10] x86, perf: Support sysfs files depending on SMT status |
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* Andi Kleen <andi@firstfloor.org> wrote:
> +ssize_t events_ht_sysfs_show(struct device *dev, struct device_attribute *attr, > + char *page) > +{ > + struct perf_pmu_events_ht_attr *pmu_attr = > + container_of(attr, struct perf_pmu_events_ht_attr, attr); > + > + /* > + * Report conditional events depending on Hyper-Threading. > + * > + * This is overly conservative as usually the HT special > + * handling is not needed if the other CPU thread is idle. > + * > + * Note this does not (cannot) handle the case when thread > + * siblings are invisible, for example with virtualization > + * if they are owned by some other guest. The user tool > + * has to re-read when a thread sibling gets onlined later. > + */ > + > + return sprintf(page, "%s", > + topology_max_smt_threads() > 1 ? > + pmu_attr->event_str_ht : > + pmu_attr->event_str_noht); > +} > + > EVENT_ATTR(cpu-cycles, CPU_CYCLES ); > EVENT_ATTR(instructions, INSTRUCTIONS ); > EVENT_ATTR(cache-references, CACHE_REFERENCES ); > diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h > index 8bd764df815d..ad2e870f77d9 100644 > --- a/arch/x86/events/perf_event.h > +++ b/arch/x86/events/perf_event.h > @@ -668,6 +668,14 @@ static struct perf_pmu_events_attr event_attr_##v = { \ > .event_str = str, \ > }; > > +#define EVENT_ATTR_STR_HT(_name, v, noht, ht) \ > +static struct perf_pmu_events_ht_attr event_attr_##v = { \ > + .attr = __ATTR(_name, 0444, events_ht_sysfs_show, NULL),\ > + .id = 0, \ > + .event_str_noht = noht, \ > + .event_str_ht = ht, \ > +} > + > extern struct x86_pmu x86_pmu __read_mostly; > > static inline bool x86_pmu_has_lbr_callstack(void) > @@ -938,6 +946,12 @@ int p6_pmu_init(void); > > int knc_pmu_init(void); > > +ssize_t events_sysfs_show(struct device *dev, struct device_attribute *attr, > + char *page); > + > +ssize_t events_ht_sysfs_show(struct device *dev, struct device_attribute *attr, > + char *page); > + > static inline int is_ht_workaround_enabled(void) > { > return !!(x86_pmu.flags & PMU_FL_EXCL_ENABLED); > diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h > index 9e1c3ada91c4..b425f2d24b26 100644 > --- a/include/linux/perf_event.h > +++ b/include/linux/perf_event.h > @@ -1304,6 +1304,13 @@ struct perf_pmu_events_attr { > const char *event_str; > }; > > +struct perf_pmu_events_ht_attr { > + struct device_attribute attr; > + u64 id; > + const char *event_str_ht; > + const char *event_str_noht; > +}; > + > ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr, > char *page); >
NAK for the following stylistic reasons:
- structure definition does not follow existing style.
- silly line breaks inserted into random positions that make the code ugly.
Thanks,
Ingo
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