Re: [PATCH v1 8/9] perf stat: Remove --per-thread pid/tid limitation

From: Jin, Yao
Date: Wed Nov 22 2017 - 00:34:57 EST

On 11/21/2017 11:18 PM, Jiri Olsa wrote:
On Mon, Nov 20, 2017 at 10:43:43PM +0800, Jin Yao wrote:


diff --git a/tools/perf/util/target.h b/tools/perf/util/target.h
index 446aa7a..6ef01a8 100644
--- a/tools/perf/util/target.h
+++ b/tools/perf/util/target.h
@@ -64,6 +64,11 @@ static inline bool target__none(struct target *target)
return !target__has_task(target) && !target__has_cpu(target);
+static inline bool target__has_per_thread(struct target *target)
+ return target->system_wide && target->per_thread;

this is confusing.. has_per_thread depends on system_wide?

This patch series only supports to get per-thread data for the whole system.

So I add checking of system_wide here.

static inline bool target__uses_dummy_map(struct target *target)
bool use_dummy = false;
@@ -73,6 +78,8 @@ static inline bool target__uses_dummy_map(struct target *target)
else if (target__has_task(target) ||
(!target__has_cpu(target) && !target->uses_mmap))
use_dummy = true;
+ else if (target__has_per_thread(target))
+ use_dummy = true;

why do we need dummy_map for this? please comment

We need dummy_map here. That's similar to the processing of '--per-thread -p -t'.

We need a dummy map to help us to aggregate counts per-thread.

Jin Yao