From 66f066d8994bd146304bab72fa09c1e644c4b3ff Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Mon, 6 Oct 2014 09:46:00 +0900 Subject: perf callchain: Create an address space per thread The unw_addr_space_t in libunwind represents an address space to be used for stack unwinding. It doesn't need to be create/destory everytime to unwind callchain (as in get_entries) and can have a same lifetime as thread (unless exec called). So move the address space construction/destruction logic to the thread lifetime handling functions. This is a preparation to enable caching in the unwind library. Note that it saves unw_addr_space_t object using thread__set_priv(). It seems currently only used by perf trace and perf kvm stat commands which don't use callchain. Signed-off-by: Namhyung Kim Acked-by: Jean Pihet Acked-by: Jiri Olsa Cc: Arun Sharma Cc: David Ahern Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Jean Pihet Cc: Jiri Olsa Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1412556363-26229-3-git-send-email-namhyung@kernel.org [ Fixup unwind-libunwind.c missing CALLCHAIN_DWARF definition, added missing __maybe_unused on unused parameters in stubs at util/unwind.h ] Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/thread.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'tools/perf/util/thread.c') diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c index a9df7f2..2b7b2d9 100644 --- a/tools/perf/util/thread.c +++ b/tools/perf/util/thread.c @@ -7,6 +7,7 @@ #include "util.h" #include "debug.h" #include "comm.h" +#include "unwind.h" int thread__init_map_groups(struct thread *thread, struct machine *machine) { @@ -37,6 +38,9 @@ struct thread *thread__new(pid_t pid, pid_t tid) thread->cpu = -1; INIT_LIST_HEAD(&thread->comm_list); + if (unwind__prepare_access(thread) < 0) + goto err_thread; + comm_str = malloc(32); if (!comm_str) goto err_thread; @@ -48,6 +52,7 @@ struct thread *thread__new(pid_t pid, pid_t tid) goto err_thread; list_add(&comm->list, &thread->comm_list); + } return thread; @@ -69,6 +74,7 @@ void thread__delete(struct thread *thread) list_del(&comm->list); comm__free(comm); } + unwind__finish_access(thread); free(thread); } -- cgit v1.1