Re: [PATCH] oprofile, perf: Use per-cpu framework

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On 03/02/2012 06:31 AM, Robert Richter wrote:
> On 23.02.12 17:25:11, Robert Richter wrote:
>> On 23.02.12 10:12:35, Will Deacon wrote:
>>> On Thu, Feb 23, 2012 at 04:08:23AM +0000, William Cohen wrote:
>>>> I was looking to see why the arm kernel builds for fedora 17 were failing with:
>>>> arch/arm/oprofile/../../../drivers/oprofile/oprofile_perf.c:28:28: error: variably modified 'perf_events' at file scope
>>>> The error points to the following line in oprofile_perf.c:
>>>> static struct perf_event **perf_events[nr_cpumask_bits];
>>> That or use NR_CPUS instead (which will be the same as nr_cpu_ids on ARM).
>> William,
>> the patch below uses per-cpu macros and should probably fix the
>> above. But it's *compile tested only*.
> William,
> could you give this patch a try? I would like to remove the cpu array
> implementation and change the code to use the cpu framework.
> Please, send me also your config for further testing.
> Many thanks,
> -Robert

Hi Robert,

After getting the perf support working on the trimslice machine with the 3.3.0-rc5+ kernel I tried the patch today with the attached fixup for kzalloc on an arm machine. Also made sure that the following options were set:


Your patch compiles and seems to work. I exercised oprofile a bit on the arm machine with the simple script.   I didn't see complaints on the /var/log/messages.

>From d57b6756b89682b692c34f10a144ac204308b6f5 Mon Sep 17 00:00:00 2001
From: William Cohen <wcohen@xxxxxxxxxx>
Date: Sun, 4 Mar 2012 20:02:55 -0500
Subject: [PATCH] Correct arguments for kzalloc for oprofile_perf.c patch

Signed-off-by: William Cohen <wcohen@xxxxxxxxxx>
 drivers/oprofile/oprofile_perf.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/oprofile/oprofile_perf.c b/drivers/oprofile/oprofile_perf.c
index 54192f3..4edbf58 100644
--- a/drivers/oprofile/oprofile_perf.c
+++ b/drivers/oprofile/oprofile_perf.c
@@ -284,7 +284,7 @@ int __init oprofile_perf_init(struct oprofile_operations *ops)
 		goto out;
-	counter_config = kzalloc(num_counters,
+	counter_config = kzalloc(num_counters *
 			sizeof(struct op_counter_config), GFP_KERNEL);
 	if (!counter_config) {
@@ -296,7 +296,7 @@ int __init oprofile_perf_init(struct oprofile_operations *ops)
 	for_each_possible_cpu(cpu) {
-		per_cpu(perf_events, cpu) = kzalloc(num_counters,
+		per_cpu(perf_events, cpu) = kzalloc(num_counters *
 				sizeof(struct perf_event *), GFP_KERNEL);
 		if (!per_cpu(perf_events, cpu)) {
 			pr_info("oprofile: failed to allocate %d perf events "

Description: Bourne shell script

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