From 8dc85d547285668e509f86c177bcd4ea055bcaaf Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Thu, 2 Sep 2010 16:50:03 +0200 Subject: perf: Multiple task contexts Provide the infrastructure for multiple task contexts. A more flexible approach would have resulted in more pointer chases in the scheduling hot-paths. This approach has the limitation of a static number of task contexts. Since I expect most external PMUs to be system wide, or at least node wide (as per the intel uncore unit) they won't actually need a task context. Signed-off-by: Peter Zijlstra Cc: paulus Cc: stephane eranian Cc: Robert Richter Cc: Frederic Weisbecker Cc: Lin Ming Cc: Yanmin LKML-Reference: Signed-off-by: Ingo Molnar --- include/linux/perf_event.h | 1 + include/linux/sched.h | 8 +++++++- 2 files changed, 8 insertions(+), 1 deletion(-) (limited to 'include') diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 22155ef3b362..9ecfd856ce6e 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -572,6 +572,7 @@ struct pmu { int * __percpu pmu_disable_count; struct perf_cpu_context * __percpu pmu_cpu_context; + int task_ctx_nr; /* * Fully disable/enable this PMU, can be used to protect from the PMI diff --git a/include/linux/sched.h b/include/linux/sched.h index 1e2a6db2d7dd..89d6023c6f82 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1160,6 +1160,12 @@ struct sched_rt_entity { struct rcu_node; +enum perf_event_task_context { + perf_invalid_context = -1, + perf_hw_context = 0, + perf_nr_task_contexts, +}; + struct task_struct { volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ void *stack; @@ -1431,7 +1437,7 @@ struct task_struct { struct futex_pi_state *pi_state_cache; #endif #ifdef CONFIG_PERF_EVENTS - struct perf_event_context *perf_event_ctxp; + struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; struct mutex perf_event_mutex; struct list_head perf_event_list; #endif -- cgit v1.2.2