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Diffstat (limited to 'kernel/perf_event.c')
-rw-r--r--kernel/perf_event.c21
1 files changed, 10 insertions, 11 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 3f5309db72f..86f394e15d5 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -2053,15 +2053,14 @@ errout:
}
static struct perf_event_context *
-find_get_context(struct pmu *pmu, pid_t pid, int cpu)
+find_get_context(struct pmu *pmu, struct task_struct *task, int cpu)
{
struct perf_event_context *ctx;
struct perf_cpu_context *cpuctx;
- struct task_struct *task;
unsigned long flags;
int ctxn, err;
- if (pid == -1 && cpu != -1) {
+ if (!task && cpu != -1) {
/* Must be root to operate on a CPU event: */
if (perf_paranoid_cpu() && !capable(CAP_SYS_ADMIN))
return ERR_PTR(-EACCES);
@@ -2084,10 +2083,6 @@ find_get_context(struct pmu *pmu, pid_t pid, int cpu)
return ctx;
}
- task = find_lively_task_by_vpid(pid);
- if (IS_ERR(task))
- return (void*)task;
-
err = -EINVAL;
ctxn = pmu->task_ctx_nr;
if (ctxn < 0)
@@ -5527,6 +5522,7 @@ SYSCALL_DEFINE5(perf_event_open,
struct perf_event_context *ctx;
struct file *event_file = NULL;
struct file *group_file = NULL;
+ struct task_struct *task = NULL;
struct pmu *pmu;
int event_fd;
int fput_needed = 0;
@@ -5581,10 +5577,13 @@ SYSCALL_DEFINE5(perf_event_open,
if ((pmu->task_ctx_nr == perf_sw_context) && group_leader)
pmu = group_leader->pmu;
+ if (pid != -1)
+ task = find_lively_task_by_vpid(pid);
+
/*
* Get the target context (task or percpu):
*/
- ctx = find_get_context(pmu, pid, cpu);
+ ctx = find_get_context(pmu, task, cpu);
if (IS_ERR(ctx)) {
err = PTR_ERR(ctx);
goto err_group_fd;
@@ -5666,11 +5665,11 @@ err_fd:
*
* @attr: attributes of the counter to create
* @cpu: cpu in which the counter is bound
- * @pid: task to profile
+ * @task: task to profile (NULL for percpu)
*/
struct perf_event *
perf_event_create_kernel_counter(struct perf_event_attr *attr, int cpu,
- pid_t pid,
+ struct task_struct *task,
perf_overflow_handler_t overflow_handler)
{
struct perf_event_context *ctx;
@@ -5687,7 +5686,7 @@ perf_event_create_kernel_counter(struct perf_event_attr *attr, int cpu,
goto err;
}
- ctx = find_get_context(event->pmu, pid, cpu);
+ ctx = find_get_context(event->pmu, task, cpu);
if (IS_ERR(ctx)) {
err = PTR_ERR(ctx);
goto err_free;