linux-kernel - [tip:perf/core] perf top: Update event name when falling back to cpu-clock

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Date:	Thu, 10 May 2012 23:47:57 -0700
From:	tip-bot for David Ahern <dsahern@...il.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, hpa@...or.com,
	mingo@...nel.org, dsahern@...il.com, tglx@...utronix.de
Subject: [tip:perf/core] perf top:
  Update event name when falling back to cpu-clock

Commit-ID:  40491eaa46a693e8c6ef94102350a747c63e584d
Gitweb:     http://git.kernel.org/tip/40491eaa46a693e8c6ef94102350a747c63e584d
Author:     David Ahern <dsahern@...il.com>
AuthorDate: Tue, 8 May 2012 10:49:49 -0600
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 9 May 2012 12:01:57 -0300

perf top: Update event name when falling back to cpu-clock

The 'perf top' command falls back to cpu-clock if the H/W cycles event
is not supported, but the event name is not updated leading to a
misleading header:

PerfTop: 8 irqs/sec  kernel:75.0%  exact:  0.0% [1000Hz cycles],  ...

Update the event name when the event type is changed so that the
header displays correctly:

PerfTop: 794 irqs/sec  kernel:100.0%  exact:  0.0% [1000Hz cpu-clock], ...

Signed-off-by: David Ahern <dsahern@...il.com>
Link: http://lkml.kernel.org/r/1336495789-58420-1-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-top.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index c53cdab..4eb6171 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -948,6 +948,10 @@ try_again:
 
 				attr->type = PERF_TYPE_SOFTWARE;
 				attr->config = PERF_COUNT_SW_CPU_CLOCK;
+				if (counter->name) {
+					free(counter->name);
+					counter->name = strdup(event_name(counter));
+				}
 				goto try_again;
 			}
 
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