forked from luck/tmp_suning_uos_patched
perf/core: Split context's event group list into pinned and non-pinned lists
Split-up struct perf_event_context::group_list into pinned_groups and flexible_groups (non-pinned). This first appears to be useless as it duplicates various loops around the group list handlings. But it scales better in the fast-path in perf_sched_in(). We don't anymore iterate twice through the entire list to separate pinned and non-pinned scheduling. Instead we interate through two distinct lists. The another desired effect is that it makes easier to define distinct scheduling rules on both. Changes in v2: - Respectively rename pinned_grp_list and volatile_grp_list into pinned_groups and flexible_groups as per Ingo suggestion. - Various cleanups Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
This commit is contained in:
parent
881516eb82
commit
889ff01506
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@ -683,7 +683,8 @@ struct perf_event_context {
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*/
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struct mutex mutex;
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struct list_head group_list;
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struct list_head pinned_groups;
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struct list_head flexible_groups;
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struct list_head event_list;
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int nr_events;
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int nr_active;
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@ -289,6 +289,15 @@ static void update_event_times(struct perf_event *event)
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event->total_time_running = run_end - event->tstamp_running;
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}
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static struct list_head *
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ctx_group_list(struct perf_event *event, struct perf_event_context *ctx)
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{
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if (event->attr.pinned)
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return &ctx->pinned_groups;
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else
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return &ctx->flexible_groups;
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}
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/*
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* Add a event from the lists for its context.
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* Must be called with ctx->mutex and ctx->lock held.
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@ -303,9 +312,12 @@ list_add_event(struct perf_event *event, struct perf_event_context *ctx)
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* add it straight to the context's event list, or to the group
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* leader's sibling list:
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*/
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if (group_leader == event)
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list_add_tail(&event->group_entry, &ctx->group_list);
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else {
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if (group_leader == event) {
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struct list_head *list;
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list = ctx_group_list(event, ctx);
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list_add_tail(&event->group_entry, list);
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} else {
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list_add_tail(&event->group_entry, &group_leader->sibling_list);
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group_leader->nr_siblings++;
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}
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@ -355,8 +367,10 @@ list_del_event(struct perf_event *event, struct perf_event_context *ctx)
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* to the context list directly:
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*/
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list_for_each_entry_safe(sibling, tmp, &event->sibling_list, group_entry) {
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struct list_head *list;
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list_move_tail(&sibling->group_entry, &ctx->group_list);
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list = ctx_group_list(event, ctx);
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list_move_tail(&sibling->group_entry, list);
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sibling->group_leader = sibling;
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}
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}
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@ -1056,7 +1070,10 @@ void __perf_event_sched_out(struct perf_event_context *ctx,
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perf_disable();
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if (ctx->nr_active) {
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list_for_each_entry(event, &ctx->group_list, group_entry)
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list_for_each_entry(event, &ctx->pinned_groups, group_entry)
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group_sched_out(event, cpuctx, ctx);
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list_for_each_entry(event, &ctx->flexible_groups, group_entry)
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group_sched_out(event, cpuctx, ctx);
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}
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perf_enable();
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@ -1271,9 +1288,8 @@ __perf_event_sched_in(struct perf_event_context *ctx,
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* First go through the list and put on any pinned groups
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* in order to give them the best chance of going on.
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*/
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list_for_each_entry(event, &ctx->group_list, group_entry) {
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if (event->state <= PERF_EVENT_STATE_OFF ||
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!event->attr.pinned)
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list_for_each_entry(event, &ctx->pinned_groups, group_entry) {
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if (event->state <= PERF_EVENT_STATE_OFF)
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continue;
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if (event->cpu != -1 && event->cpu != cpu)
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continue;
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@ -1291,15 +1307,10 @@ __perf_event_sched_in(struct perf_event_context *ctx,
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}
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}
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list_for_each_entry(event, &ctx->group_list, group_entry) {
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/*
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* Ignore events in OFF or ERROR state, and
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* ignore pinned events since we did them already.
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*/
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if (event->state <= PERF_EVENT_STATE_OFF ||
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event->attr.pinned)
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list_for_each_entry(event, &ctx->flexible_groups, group_entry) {
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/* Ignore events in OFF or ERROR state */
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if (event->state <= PERF_EVENT_STATE_OFF)
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continue;
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/*
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* Listen to the 'cpu' scheduling filter constraint
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* of events:
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@ -1453,8 +1464,13 @@ static void rotate_ctx(struct perf_event_context *ctx)
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* Rotate the first entry last (works just fine for group events too):
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*/
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perf_disable();
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list_for_each_entry(event, &ctx->group_list, group_entry) {
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list_move_tail(&event->group_entry, &ctx->group_list);
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list_for_each_entry(event, &ctx->pinned_groups, group_entry) {
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list_move_tail(&event->group_entry, &ctx->pinned_groups);
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break;
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}
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list_for_each_entry(event, &ctx->flexible_groups, group_entry) {
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list_move_tail(&event->group_entry, &ctx->flexible_groups);
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break;
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}
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perf_enable();
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@ -1490,6 +1506,21 @@ void perf_event_task_tick(struct task_struct *curr)
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perf_event_task_sched_in(curr);
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}
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static int event_enable_on_exec(struct perf_event *event,
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struct perf_event_context *ctx)
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{
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if (!event->attr.enable_on_exec)
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return 0;
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event->attr.enable_on_exec = 0;
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if (event->state >= PERF_EVENT_STATE_INACTIVE)
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return 0;
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__perf_event_mark_enabled(event, ctx);
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return 1;
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}
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/*
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* Enable all of a task's events that have been marked enable-on-exec.
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* This expects task == current.
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@ -1500,6 +1531,7 @@ static void perf_event_enable_on_exec(struct task_struct *task)
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struct perf_event *event;
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unsigned long flags;
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int enabled = 0;
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int ret;
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local_irq_save(flags);
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ctx = task->perf_event_ctxp;
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@ -1510,14 +1542,16 @@ static void perf_event_enable_on_exec(struct task_struct *task)
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raw_spin_lock(&ctx->lock);
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list_for_each_entry(event, &ctx->group_list, group_entry) {
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if (!event->attr.enable_on_exec)
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continue;
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event->attr.enable_on_exec = 0;
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if (event->state >= PERF_EVENT_STATE_INACTIVE)
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continue;
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__perf_event_mark_enabled(event, ctx);
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enabled = 1;
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list_for_each_entry(event, &ctx->pinned_groups, group_entry) {
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ret = event_enable_on_exec(event, ctx);
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if (ret)
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enabled = 1;
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}
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list_for_each_entry(event, &ctx->flexible_groups, group_entry) {
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ret = event_enable_on_exec(event, ctx);
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if (ret)
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enabled = 1;
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}
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/*
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@ -1591,7 +1625,8 @@ __perf_event_init_context(struct perf_event_context *ctx,
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{
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raw_spin_lock_init(&ctx->lock);
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mutex_init(&ctx->mutex);
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INIT_LIST_HEAD(&ctx->group_list);
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INIT_LIST_HEAD(&ctx->pinned_groups);
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INIT_LIST_HEAD(&ctx->flexible_groups);
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INIT_LIST_HEAD(&ctx->event_list);
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atomic_set(&ctx->refcount, 1);
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ctx->task = task;
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@ -5032,7 +5067,11 @@ void perf_event_exit_task(struct task_struct *child)
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mutex_lock_nested(&child_ctx->mutex, SINGLE_DEPTH_NESTING);
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again:
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list_for_each_entry_safe(child_event, tmp, &child_ctx->group_list,
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list_for_each_entry_safe(child_event, tmp, &child_ctx->pinned_groups,
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group_entry)
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__perf_event_exit_task(child_event, child_ctx, child);
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list_for_each_entry_safe(child_event, tmp, &child_ctx->flexible_groups,
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group_entry)
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__perf_event_exit_task(child_event, child_ctx, child);
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* its siblings to the list, but we obtained 'tmp' before that which
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* will still point to the list head terminating the iteration.
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*/
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if (!list_empty(&child_ctx->group_list))
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if (!list_empty(&child_ctx->pinned_groups) ||
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!list_empty(&child_ctx->flexible_groups))
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goto again;
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mutex_unlock(&child_ctx->mutex);
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@ -5049,6 +5089,24 @@ void perf_event_exit_task(struct task_struct *child)
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put_ctx(child_ctx);
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}
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static void perf_free_event(struct perf_event *event,
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struct perf_event_context *ctx)
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{
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struct perf_event *parent = event->parent;
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if (WARN_ON_ONCE(!parent))
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return;
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mutex_lock(&parent->child_mutex);
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list_del_init(&event->child_list);
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mutex_unlock(&parent->child_mutex);
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fput(parent->filp);
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list_del_event(event, ctx);
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free_event(event);
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}
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/*
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* free an unexposed, unused context as created by inheritance by
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* init_task below, used by fork() in case of fail.
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mutex_lock(&ctx->mutex);
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again:
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list_for_each_entry_safe(event, tmp, &ctx->group_list, group_entry) {
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struct perf_event *parent = event->parent;
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list_for_each_entry_safe(event, tmp, &ctx->pinned_groups, group_entry)
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perf_free_event(event, ctx);
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if (WARN_ON_ONCE(!parent))
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continue;
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list_for_each_entry_safe(event, tmp, &ctx->flexible_groups,
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group_entry)
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perf_free_event(event, ctx);
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mutex_lock(&parent->child_mutex);
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list_del_init(&event->child_list);
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mutex_unlock(&parent->child_mutex);
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fput(parent->filp);
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list_del_event(event, ctx);
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free_event(event);
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}
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if (!list_empty(&ctx->group_list))
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if (!list_empty(&ctx->pinned_groups) ||
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!list_empty(&ctx->flexible_groups))
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goto again;
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mutex_unlock(&ctx->mutex);
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put_ctx(ctx);
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}
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static int
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inherit_task_group(struct perf_event *event, struct task_struct *parent,
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struct perf_event_context *parent_ctx,
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struct task_struct *child,
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int *inherited_all)
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{
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int ret;
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struct perf_event_context *child_ctx = child->perf_event_ctxp;
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if (!event->attr.inherit) {
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*inherited_all = 0;
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return 0;
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}
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if (!child_ctx) {
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/*
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* This is executed from the parent task context, so
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* inherit events that have been marked for cloning.
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* First allocate and initialize a context for the
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* child.
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*/
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child_ctx = kzalloc(sizeof(struct perf_event_context),
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GFP_KERNEL);
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if (!child_ctx)
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return -ENOMEM;
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__perf_event_init_context(child_ctx, child);
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child->perf_event_ctxp = child_ctx;
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get_task_struct(child);
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}
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ret = inherit_group(event, parent, parent_ctx,
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child, child_ctx);
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if (ret)
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*inherited_all = 0;
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return ret;
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}
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/*
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* Initialize the perf_event context in task_struct
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*/
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int perf_event_init_task(struct task_struct *child)
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{
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struct perf_event_context *child_ctx = NULL, *parent_ctx;
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struct perf_event_context *child_ctx, *parent_ctx;
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struct perf_event_context *cloned_ctx;
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struct perf_event *event;
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struct task_struct *parent = current;
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* We dont have to disable NMIs - we are only looking at
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* the list, not manipulating it:
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*/
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list_for_each_entry(event, &parent_ctx->group_list, group_entry) {
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if (!event->attr.inherit) {
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inherited_all = 0;
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continue;
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}
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if (!child->perf_event_ctxp) {
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/*
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* This is executed from the parent task context, so
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* inherit events that have been marked for cloning.
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* First allocate and initialize a context for the
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* child.
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*/
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child_ctx = kzalloc(sizeof(struct perf_event_context),
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GFP_KERNEL);
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if (!child_ctx) {
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ret = -ENOMEM;
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break;
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}
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__perf_event_init_context(child_ctx, child);
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child->perf_event_ctxp = child_ctx;
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get_task_struct(child);
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}
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ret = inherit_group(event, parent, parent_ctx,
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child, child_ctx);
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if (ret) {
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inherited_all = 0;
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list_for_each_entry(event, &parent_ctx->pinned_groups, group_entry) {
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ret = inherit_task_group(event, parent, parent_ctx, child,
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&inherited_all);
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if (ret)
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break;
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}
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}
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list_for_each_entry(event, &parent_ctx->flexible_groups, group_entry) {
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ret = inherit_task_group(event, parent, parent_ctx, child,
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&inherited_all);
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if (ret)
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break;
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}
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child_ctx = child->perf_event_ctxp;
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if (child_ctx && inherited_all) {
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/*
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* Mark the child context as a clone of the parent
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@ -5213,7 +5286,9 @@ static void __perf_event_exit_cpu(void *info)
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struct perf_event_context *ctx = &cpuctx->ctx;
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struct perf_event *event, *tmp;
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list_for_each_entry_safe(event, tmp, &ctx->group_list, group_entry)
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list_for_each_entry_safe(event, tmp, &ctx->pinned_groups, group_entry)
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__perf_event_remove_from_context(event);
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list_for_each_entry_safe(event, tmp, &ctx->flexible_groups, group_entry)
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__perf_event_remove_from_context(event);
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}
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static void perf_event_exit_cpu(int cpu)
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