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...@gmail.com> 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. 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-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
