Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fixes from Thomas Gleixner: - Fix for a task exit cleanup race caused by a missing a preempt disable - Cleanup of the event notification functions with a massive reduction of duplicated code * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf: Factor out auxiliary events notification perf: Fix EXIT event notification
This commit is contained in:
Linus Torvalds
Коммит
652df602f8
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@ -4394,6 +4394,64 @@ perf_event_read_event(struct perf_event *event,
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perf_output_end(&handle);
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}
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typedef int (perf_event_aux_match_cb)(struct perf_event *event, void *data);
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typedef void (perf_event_aux_output_cb)(struct perf_event *event, void *data);
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static void
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perf_event_aux_ctx(struct perf_event_context *ctx,
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perf_event_aux_match_cb match,
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perf_event_aux_output_cb output,
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void *data)
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{
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struct perf_event *event;
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list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {
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if (event->state < PERF_EVENT_STATE_INACTIVE)
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continue;
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if (!event_filter_match(event))
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continue;
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if (match(event, data))
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output(event, data);
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}
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}
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static void
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perf_event_aux(perf_event_aux_match_cb match,
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perf_event_aux_output_cb output,
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void *data,
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struct perf_event_context *task_ctx)
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{
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struct perf_cpu_context *cpuctx;
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struct perf_event_context *ctx;
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struct pmu *pmu;
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int ctxn;
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rcu_read_lock();
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list_for_each_entry_rcu(pmu, &pmus, entry) {
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cpuctx = get_cpu_ptr(pmu->pmu_cpu_context);
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if (cpuctx->unique_pmu != pmu)
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goto next;
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perf_event_aux_ctx(&cpuctx->ctx, match, output, data);
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if (task_ctx)
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goto next;
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ctxn = pmu->task_ctx_nr;
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if (ctxn < 0)
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goto next;
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ctx = rcu_dereference(current->perf_event_ctxp[ctxn]);
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if (ctx)
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perf_event_aux_ctx(ctx, match, output, data);
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next:
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put_cpu_ptr(pmu->pmu_cpu_context);
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}
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if (task_ctx) {
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preempt_disable();
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perf_event_aux_ctx(task_ctx, match, output, data);
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preempt_enable();
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}
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rcu_read_unlock();
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}
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/*
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* task tracking -- fork/exit
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*
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@ -4416,8 +4474,9 @@ struct perf_task_event {
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};
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static void perf_event_task_output(struct perf_event *event,
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struct perf_task_event *task_event)
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void *data)
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{
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struct perf_task_event *task_event = data;
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struct perf_output_handle handle;
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struct perf_sample_data sample;
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struct task_struct *task = task_event->task;
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@ -4445,62 +4504,11 @@ out:
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task_event->event_id.header.size = size;
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}
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static int perf_event_task_match(struct perf_event *event)
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static int perf_event_task_match(struct perf_event *event,
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void *data __maybe_unused)
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{
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if (event->state < PERF_EVENT_STATE_INACTIVE)
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return 0;
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if (!event_filter_match(event))
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return 0;
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if (event->attr.comm || event->attr.mmap ||
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event->attr.mmap_data || event->attr.task)
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return 1;
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return 0;
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}
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static void perf_event_task_ctx(struct perf_event_context *ctx,
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struct perf_task_event *task_event)
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{
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struct perf_event *event;
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list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {
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if (perf_event_task_match(event))
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perf_event_task_output(event, task_event);
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}
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}
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static void perf_event_task_event(struct perf_task_event *task_event)
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{
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struct perf_cpu_context *cpuctx;
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struct perf_event_context *ctx;
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struct pmu *pmu;
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int ctxn;
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rcu_read_lock();
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list_for_each_entry_rcu(pmu, &pmus, entry) {
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cpuctx = get_cpu_ptr(pmu->pmu_cpu_context);
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if (cpuctx->unique_pmu != pmu)
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goto next;
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perf_event_task_ctx(&cpuctx->ctx, task_event);
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ctx = task_event->task_ctx;
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if (!ctx) {
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ctxn = pmu->task_ctx_nr;
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if (ctxn < 0)
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goto next;
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ctx = rcu_dereference(current->perf_event_ctxp[ctxn]);
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if (ctx)
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perf_event_task_ctx(ctx, task_event);
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}
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next:
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put_cpu_ptr(pmu->pmu_cpu_context);
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}
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if (task_event->task_ctx)
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perf_event_task_ctx(task_event->task_ctx, task_event);
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rcu_read_unlock();
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return event->attr.comm || event->attr.mmap ||
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event->attr.mmap_data || event->attr.task;
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}
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static void perf_event_task(struct task_struct *task,
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@ -4531,7 +4539,10 @@ static void perf_event_task(struct task_struct *task,
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},
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};
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perf_event_task_event(&task_event);
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perf_event_aux(perf_event_task_match,
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perf_event_task_output,
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&task_event,
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task_ctx);
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}
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void perf_event_fork(struct task_struct *task)
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@ -4557,8 +4568,9 @@ struct perf_comm_event {
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};
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static void perf_event_comm_output(struct perf_event *event,
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struct perf_comm_event *comm_event)
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void *data)
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{
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struct perf_comm_event *comm_event = data;
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struct perf_output_handle handle;
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struct perf_sample_data sample;
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int size = comm_event->event_id.header.size;
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@ -4585,39 +4597,16 @@ out:
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comm_event->event_id.header.size = size;
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}
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static int perf_event_comm_match(struct perf_event *event)
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static int perf_event_comm_match(struct perf_event *event,
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void *data __maybe_unused)
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{
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if (event->state < PERF_EVENT_STATE_INACTIVE)
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return 0;
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if (!event_filter_match(event))
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return 0;
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if (event->attr.comm)
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return 1;
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return 0;
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}
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static void perf_event_comm_ctx(struct perf_event_context *ctx,
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struct perf_comm_event *comm_event)
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{
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struct perf_event *event;
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list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {
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if (perf_event_comm_match(event))
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perf_event_comm_output(event, comm_event);
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}
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return event->attr.comm;
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}
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static void perf_event_comm_event(struct perf_comm_event *comm_event)
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{
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struct perf_cpu_context *cpuctx;
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struct perf_event_context *ctx;
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char comm[TASK_COMM_LEN];
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unsigned int size;
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struct pmu *pmu;
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int ctxn;
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memset(comm, 0, sizeof(comm));
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strlcpy(comm, comm_event->task->comm, sizeof(comm));
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@ -4627,24 +4616,11 @@ static void perf_event_comm_event(struct perf_comm_event *comm_event)
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comm_event->comm_size = size;
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comm_event->event_id.header.size = sizeof(comm_event->event_id) + size;
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rcu_read_lock();
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list_for_each_entry_rcu(pmu, &pmus, entry) {
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cpuctx = get_cpu_ptr(pmu->pmu_cpu_context);
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if (cpuctx->unique_pmu != pmu)
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goto next;
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perf_event_comm_ctx(&cpuctx->ctx, comm_event);
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ctxn = pmu->task_ctx_nr;
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if (ctxn < 0)
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goto next;
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ctx = rcu_dereference(current->perf_event_ctxp[ctxn]);
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if (ctx)
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perf_event_comm_ctx(ctx, comm_event);
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next:
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put_cpu_ptr(pmu->pmu_cpu_context);
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}
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rcu_read_unlock();
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perf_event_aux(perf_event_comm_match,
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perf_event_comm_output,
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comm_event,
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NULL);
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}
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void perf_event_comm(struct task_struct *task)
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@ -4706,8 +4682,9 @@ struct perf_mmap_event {
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};
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static void perf_event_mmap_output(struct perf_event *event,
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struct perf_mmap_event *mmap_event)
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void *data)
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{
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struct perf_mmap_event *mmap_event = data;
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struct perf_output_handle handle;
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struct perf_sample_data sample;
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int size = mmap_event->event_id.header.size;
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@ -4734,46 +4711,24 @@ out:
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}
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static int perf_event_mmap_match(struct perf_event *event,
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struct perf_mmap_event *mmap_event,
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int executable)
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void *data)
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{
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if (event->state < PERF_EVENT_STATE_INACTIVE)
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return 0;
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struct perf_mmap_event *mmap_event = data;
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struct vm_area_struct *vma = mmap_event->vma;
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int executable = vma->vm_flags & VM_EXEC;
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if (!event_filter_match(event))
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return 0;
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if ((!executable && event->attr.mmap_data) ||
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(executable && event->attr.mmap))
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return 1;
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return 0;
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}
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static void perf_event_mmap_ctx(struct perf_event_context *ctx,
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struct perf_mmap_event *mmap_event,
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int executable)
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{
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struct perf_event *event;
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list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {
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if (perf_event_mmap_match(event, mmap_event, executable))
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perf_event_mmap_output(event, mmap_event);
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}
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return (!executable && event->attr.mmap_data) ||
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(executable && event->attr.mmap);
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}
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static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
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{
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struct perf_cpu_context *cpuctx;
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struct perf_event_context *ctx;
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struct vm_area_struct *vma = mmap_event->vma;
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struct file *file = vma->vm_file;
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unsigned int size;
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char tmp[16];
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char *buf = NULL;
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const char *name;
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struct pmu *pmu;
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int ctxn;
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memset(tmp, 0, sizeof(tmp));
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@ -4829,27 +4784,10 @@ got_name:
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mmap_event->event_id.header.size = sizeof(mmap_event->event_id) + size;
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rcu_read_lock();
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list_for_each_entry_rcu(pmu, &pmus, entry) {
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cpuctx = get_cpu_ptr(pmu->pmu_cpu_context);
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if (cpuctx->unique_pmu != pmu)
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goto next;
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perf_event_mmap_ctx(&cpuctx->ctx, mmap_event,
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vma->vm_flags & VM_EXEC);
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ctxn = pmu->task_ctx_nr;
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if (ctxn < 0)
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goto next;
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ctx = rcu_dereference(current->perf_event_ctxp[ctxn]);
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if (ctx) {
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perf_event_mmap_ctx(ctx, mmap_event,
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vma->vm_flags & VM_EXEC);
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}
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next:
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put_cpu_ptr(pmu->pmu_cpu_context);
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}
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rcu_read_unlock();
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perf_event_aux(perf_event_mmap_match,
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perf_event_mmap_output,
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mmap_event,
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NULL);
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kfree(buf);
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}
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