Merge tag 'trace-v4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux...

[deliverable/linux.git] / arch / x86 / events / core.c

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 91eac39625beb1b85fb3651a1b1758d296779c9a..dfebbde2a4cc252a7bc8ab2cd5f84c679df9336c 100644 (file)
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1622,6 +1622,29 @@ ssize_t events_sysfs_show(struct device *dev, struct device_attribute *attr, cha
 }
 EXPORT_SYMBOL_GPL(events_sysfs_show);
 
+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 (and 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        );