perf_counter: Simplify and fix task migration counting

The task migrations counter was causing rare and hard to decypher
memory corruptions under load. After a day of debugging and bisection
we found that the problem was introduced with:

  3f731ca: perf_counter: Fix cpu migration counter

Turning them off fixes the crashes. Incidentally, the whole
perf_counter_task_migration() logic can be done simpler as well,
by injecting a proper sw-counter event.

This cleanup also fixed the crashes. The precise failure mode is
not completely clear yet, but we are clearly not unhappy about
having a fix ;-)

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index e7e7e02..89698d8 100644 (file)
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -682,8 +682,6 @@ static inline void perf_counter_mmap(struct vm_area_struct *vma)
 extern void perf_counter_comm(struct task_struct *tsk);
 extern void perf_counter_fork(struct task_struct *tsk);
 
-extern void perf_counter_task_migration(struct task_struct *task, int cpu);
-
 extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
 
 extern int sysctl_perf_counter_paranoid;
@@ -724,8 +722,6 @@ static inline void perf_counter_mmap(struct vm_area_struct *vma)    { }
 static inline void perf_counter_comm(struct task_struct *tsk)          { }
 static inline void perf_counter_fork(struct task_struct *tsk)          { }
 static inline void perf_counter_init(void)                             { }
-static inline void perf_counter_task_migration(struct task_struct *task,
-                                              int cpu)                 { }
 #endif
 
 #endif /* __KERNEL__ */

diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index 7e9108e..8d4f0dd 100644 (file)
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -124,7 +124,7 @@ void perf_enable(void)
 
 static void get_ctx(struct perf_counter_context *ctx)
 {
-       atomic_inc(&ctx->refcount);
+       WARN_ON(!atomic_inc_not_zero(&ctx->refcount));
 }
 
 static void free_ctx(struct rcu_head *head)
@@ -3467,27 +3467,6 @@ static const struct pmu perf_ops_task_clock = {
        .read           = task_clock_perf_counter_read,
 };
 
-/*
- * Software counter: cpu migrations
- */
-void perf_counter_task_migration(struct task_struct *task, int cpu)
-{
-       struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
-       struct perf_counter_context *ctx;
-
-       perf_swcounter_ctx_event(&cpuctx->ctx, PERF_TYPE_SOFTWARE,
-                                PERF_COUNT_SW_CPU_MIGRATIONS,
-                                1, 1, NULL, 0);
-
-       ctx = perf_pin_task_context(task);
-       if (ctx) {
-               perf_swcounter_ctx_event(ctx, PERF_TYPE_SOFTWARE,
-                                        PERF_COUNT_SW_CPU_MIGRATIONS,
-                                        1, 1, NULL, 0);
-               perf_unpin_context(ctx);
-       }
-}
-
 #ifdef CONFIG_EVENT_PROFILE
 void perf_tpcounter_event(int event_id)
 {

diff --git a/kernel/sched.c b/kernel/sched.c
index 8fb88a9..f46540b 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1978,7 +1978,8 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
                if (task_hot(p, old_rq->clock, NULL))
                        schedstat_inc(p, se.nr_forced2_migrations);
 #endif
-               perf_counter_task_migration(p, new_cpu);
+               perf_swcounter_event(PERF_COUNT_SW_CPU_MIGRATIONS,
+                                    1, 1, NULL, 0);
        }
        p->se.vruntime -= old_cfsrq->min_vruntime -
                                         new_cfsrq->min_vruntime;