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Re: [Crash-utility] FW: Number of cpus on ARM



Hello Jan,

Can you try with option --cpus=4 passed when your start the crash.
I used 4 here because i have 4 cores.

Thanks,
Arun

On Wed, Oct 15, 2014 at 2:49 PM, Karlsson, Jan <Jan Karlsson sonymobile com> wrote:

Hi

 

Unfortunately I found another older example where my patch below did not work.

In that one only cpu 0 where online but 0,1,2,3 where active. So maybe:

 

                           return MAX(get_cpus_active(), get_highest_cpu_online()+1);

 

might work better. Someone with better knowledge about this than I have should look at the problem.

 

Jan

 

Jan Karlsson

Senior Software Engineer

System Assurance

 

Sony Mobile Communications

Tel: +46 703 062 174

jan karlsson sonymobile com

 

sonymobile.com

 

Sony logotype_23px height_Email_144dpi

 

From: Karlsson, Jan
Sent: den 15 oktober 2014 10:49
To: Discussion list for crash utility usage, maintenance and development
Subject:

 

Hi

 

I have seen a problem when it comes to the number of cpus for ARM (32-bits).

 

static int

arm_get_smp_cpus(void)

{

                           return MAX(get_cpus_active(), get_cpus_online());

}

 

In one of my example, “help –k” gives me:

       cpu_possible_map: 0 1 2 3

        cpu_present_map: 0 1 2 3

         cpu_online_map: 0 3

         cpu_active_map: 3

 

So the number of cpus will become 2. However there are code in a number of places that will then only accept cpu 0 and 1 as cpus to handle.

 

When I changed to code to be the same as for ARM64 things worked as expected:

 

static int

arm_get_smp_cpus(void)

{

                           return MAX(get_cpus_online(), get_highest_cpu_online()+1);

}

 

Jan

 

Jan Karlsson

Senior Software Engineer

System Assurance

 

Sony Mobile Communications

Tel: +46 703 062 174

jan karlsson sonymobile com

 

sonymobile.com

 

Sony logotype_23px height_Email_144dpi

 


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