linux-kernel - [PATCH 1/4] kernelshark: Fix bug with Plot CPU filtering

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Date:	Wed, 14 Nov 2012 17:48:05 -0800
From:	David Sharp <dhsharp@...gle.com>
To:	Steven Rostedt <rostedt@...dmis.net>, linux-kernel@...r.kernel.org
Cc:	Venkatesh Pallipadi <venki@...gle.com>,
	David Sharp <dhsharp@...gle.com>
Subject: [PATCH 1/4] kernelshark: Fix bug with Plot CPU filtering

From: Venkatesh Pallipadi <venki@...gle.com>

Plot CPU filtering in kernelshark has the following bug:
1) Deselect CPU A from Plot CPU list
2) Plot gets updated with no CPU A
3) Deselect CPU B
4) Plot continues to have CPU B

This is due to a bug in graph_plot_cpus_update_callback(),
which seems to be checking old_all_cpus != new_all_cpus before doing any
update. This condition is true on 1, but false on 2.
Removing that check fixes the problem.

Tested:
Above sequence now does expected filtering.

Google-bug-id: 4258610
Signed-off-by: Venkatesh Pallipadi <venki@...gle.com>
Signed-off-by: David Sharp <dhsharp@...gle.com>
---
 trace-plot-cpu.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/trace-plot-cpu.c b/trace-plot-cpu.c
index 630d6c2..bb767d3 100644
--- a/trace-plot-cpu.c
+++ b/trace-plot-cpu.c
@@ -498,9 +498,8 @@ void graph_plot_cpus_update_callback(gboolean accept,
 	/* Get the current status */
 	graph_plot_cpus_plotted(ginfo, &old_all_cpus, &old_cpu_mask);
 
-	if (old_all_cpus == all_cpus ||
-	    (selected_cpu_mask &&
-	     cpus_equal(old_cpu_mask, selected_cpu_mask, ginfo->cpus))) {
+	if (selected_cpu_mask &&
+	     cpus_equal(old_cpu_mask, selected_cpu_mask, ginfo->cpus)) {
 		/* Nothing to do */
 		g_free(old_cpu_mask);
 		return;
-- 
1.7.7.3

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