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

Hello That would be a possibility but I prefer if crash can calculate the correct number of cpus itself.

If we just want to set the number of cpus to the number of cpus present, then the function “get_cpus_present()” could probably be used.

Jan Jan Karlsson Senior Software Engineer System Assurance Sony Mobile Communications Tel: +46 703 062 174 jan.karlsson(a)sonymobile.com sonymobile.com From: crash-utility-bounces(a)redhat.com [mailto:crash-utility-bounces@redhat.com] On Behalf Of Arun KS Sent: den 15 oktober 2014 11:57 To: Discussion list for crash utility usage, maintenance and development Subject: 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(a)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(a)sonymobile.com sonymobile.com 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(a)sonymobile.com sonymobile.com -- Crash-utility mailing list Crash-utility(a)redhat.com https://www.redhat.com/mailman/listinfo/crash-utility -- Crash-utility mailing list Crash-utility(a)redhat.com https://www.redhat.com/mailman/listinfo/crash-utility