Messages in this thread | | | From | Michael Ellerman <> | Subject | Re: [PATCH 1/2] powerpc: Detect the presence of big-core with interleaved threads | Date | Fri, 18 May 2018 23:14:04 +1000 |
| |
Gautham R Shenoy <ego@linux.vnet.ibm.com> writes: ... >> > @@ -565,7 +615,16 @@ void __init smp_setup_cpu_maps(void) >> > vdso_data->processorCount = num_present_cpus(); >> > #endif /* CONFIG_PPC64 */ >> > >> > - /* Initialize CPU <=> thread mapping/ >> > + dn = of_find_node_by_type(NULL, "cpu"); >> > + if (dn) { >> > + if (check_for_interleaved_big_core(dn)) { >> > + has_interleaved_big_core = true; >> > + pr_info("Detected interleaved big-cores\n"); >> >> Is there a runtime way to check this also? If the dmesg buffer overflows, we >> lose this. > > Where do you suggest we put this ? Should it be a part of > /proc/cpuinfo ?
Hmm, it'd be nice not to pollute it with more junk.
Can you just look at the pir files in sysfs?
eg. on a normal system:
# cd /sys/devices/system/cpu # grep . cpu[0-7]/pir cpu0/pir:20 cpu1/pir:21 cpu2/pir:22 cpu3/pir:23 cpu4/pir:24 cpu5/pir:25 cpu6/pir:26 cpu7/pir:27
cheers
| |