Thankyou . But I still can not understand what is the meaning of cuplist. my linux version is ubuntu 12.04, and my system:/$ cat /sys/devices/pci0000:00/0000:00:1a.0/local_cpulist the result is '0-7', I just don't konw what are they represent .Could you give me more detailed information about local_cpulist and local_cpus,and their relations. thanks in advance :) On Thu, Apr 25, 2013 at 12:56 AM, Mike Travis <travis@xxxxxxx> wrote: > > > On 4/24/2013 9:48 AM, Bjorn Helgaas wrote: >> [+cc linux-pci, Mike] >> >> On Wed, Apr 24, 2013 at 4:06 AM, Bian LuLu <helianthus.lu@xxxxxxxxx> wrote: >>> Hi all, >>> >>> Recently, i read some codes of PCI portions. I think >>> local_cpulist is a list about one kind of CPU and >>> local_cpus is a mask of CPU. But i am not sure when >>> and how i should use these two parameters. >>> >>> See http://lxr.linux.no/linux+v3.5.4/drivers/pci/pci-sysfs.c#L390 for >>> details. >>> >>> Would anyone please give me some suggestions? >>> Thanks in advance ;-) >> >> I don't know off-hand, but maybe Mike or somebody on linux-pci does. >> It looks like Mike added local_cpulist with 39106dcf85. >> > > It primarily comes into play when you have a large # of cpus. I can not understand the symbol of '#' ,what is the meaning of it? > Here's the difference on a system that has 1024 cpu threads: > > harp31-sys:/sys/devices/system/node/node20 # cat cpulist > 160-167,672-679 > harp31-sys:/sys/devices/system/node/node20 # cat cpumap > 00000000,00000000,00000000,00000000,00000000,00000000,00000000, > 00000000,00000000,00000000,000000ff,00000000,00000000,00000000, > 00000000,00000000,00000000,00000000,00000000,00000000,00000000, > 00000000,00000000,00000000,00000000,00000000,000000ff,00000000, > 00000000,00000000,00000000,00000000 > > Which is easier to interpret? :) > > But there are some older user side utilities that still > use the mask format. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
