Messages in this thread Patch in this message | | | Date | Sat, 27 Dec 2014 08:31:36 -0700 | From | David Ahern <> | Subject | Re: [PATCH 14/37] perf tools: Convert dead thread list into rbtree |
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On 12/24/14 12:15 AM, Namhyung Kim wrote: > @@ -106,8 +117,8 @@ void machine__delete_threads(struct machine *machine) > while (nd) { > struct thread *t = rb_entry(nd, struct thread, rb_node); > > - rb_erase(&t->rb_node, &machine->threads); > nd = rb_next(nd); > + rb_erase(&t->rb_node, &machine->threads); > thread__delete(t); > } > }
unrelated to dead threads. Bug fix? separate patch?
> @@ -1236,13 +1247,36 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event > > static void machine__remove_thread(struct machine *machine, struct thread *th) > { > + struct rb_node **p = &machine->dead_threads.rb_node; > + struct rb_node *parent = NULL; > + struct thread *pos; > + > machine->last_match = NULL; > rb_erase(&th->rb_node, &machine->threads); > + > + th->dead = true; > + > /* > * We may have references to this thread, for instance in some hist_entry > - * instances, so just move them to a separate list. > + * instances, so just move them to a separate list in rbtree. > */ > - list_add_tail(&th->node, &machine->dead_threads); > + while (*p != NULL) { > + parent = *p; > + pos = rb_entry(parent, struct thread, rb_node); > + > + if (pos->tid == th->tid) { > + list_add_tail(&th->node, &pos->node); > + return; > + }
So you have a linked list for tid collisions (not mentioned in the git log).
> + > + if (th->tid < pos->tid) > + p = &(*p)->rb_left; > + else > + p = &(*p)->rb_right; > + } > + > + rb_link_node(&th->rb_node, parent, p); > + rb_insert_color(&th->rb_node, &machine->dead_threads); > } > > int machine__process_fork_event(struct machine *machine, union perf_event *event, > @@ -1649,7 +1683,7 @@ int machine__for_each_thread(struct machine *machine,
---8<---
> diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h > index 0b6dcd70bc8b..413f28cf689b 100644 > --- a/tools/perf/util/thread.h > +++ b/tools/perf/util/thread.h > @@ -11,10 +11,8 @@ > struct thread_stack; > > struct thread { > - union { > - struct rb_node rb_node; > - struct list_head node; > - }; > + struct rb_node rb_node; > + struct list_head node; > struct map_groups *mg; > pid_t pid_; /* Not all tools update this */ > pid_t tid;
could use better names for rb_node and node. rb_node is the entry in the dead_threads tree - dead_node?; node is the linked list for tid collisions - tid_node?
David
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