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perf tools: Ensure thread-stack is flushed

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The thread-stack represents a thread's current stack.  When a thread
exits there can still be many functions on the stack e.g. exit() can be
called many levels deep, so all the callers will never return.  To get
that information output, the thread-stack must be flushed.

Previously it was assumed the thread-stack would be flushed when the
struct thread was deleted.  With thread ref-counting it is no longer
clear when that will be, if ever. So instead explicitly flush all the
thread-stacks at the end of a session.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1432906425-9911-3-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter
2015-05-29 16:33:30 +03:00
committed by Arnaldo Carvalho de Melo
parent 79928928c5
commit a5499b3719
5 changed files with 58 additions and 5 deletions
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20
tools/perf/util/session.c
View File

@@ -16,6 +16,7 @@
#include "perf_regs.h"
#include "asm/bug.h"
#include "auxtrace.h"
#include "thread-stack.h"
static int perf_session__deliver_event(struct perf_session *session,
union perf_event *event,
@@ -1361,6 +1362,19 @@ static void perf_session__warn_about_errors(const struct perf_session *session)
events_stats__auxtrace_error_warn(stats);
}
static int perf_session__flush_thread_stack(struct thread *thread,
void *p __maybe_unused)
{
return thread_stack__flush(thread);
}
static int perf_session__flush_thread_stacks(struct perf_session *session)
{
return machines__for_each_thread(&session->machines,
perf_session__flush_thread_stack,
NULL);
}
volatile int session_done;
static int __perf_session__process_pipe_events(struct perf_session *session)
@@ -1450,6 +1464,9 @@ done:
if (err)
goto out_err;
err = auxtrace__flush_events(session, tool);
if (err)
goto out_err;
err = perf_session__flush_thread_stacks(session);
out_err:
free(buf);
perf_session__warn_about_errors(session);
@@ -1600,6 +1617,9 @@ out:
if (err)
goto out_err;
err = auxtrace__flush_events(session, tool);
if (err)
goto out_err;
err = perf_session__flush_thread_stacks(session);
out_err:
ui_progress__finish();
perf_session__warn_about_errors(session);