Re: [PATCHSET] percpu: generalize first chunk allocators and improve lpage NUMA support

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Andi Kleen wrote:
> 
> Haven't read the new patches, but per cpu data always was sized
> for all possible CPUs.
> 
>> and N is large, what did it cost?
> 
>> And what are reasonable values of N?
> 
> N should normally not be large anymore, since num_possible_cpus() 
> is sized based on firmware information now.
> 

*Ahem* virtual machines *ahem*...

I have discussed this with Tejun, and the plan is to allocate the percpu
information when a processor is first brought online (but not removed
when it is offlined again.)  It's a real problem for 32-bit VMs, so it's
more important than you'd think.

	-hpa

--
To unsubscribe from this list: send the line "unsubscribe linux-arch" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux Kernel]     [Kernel Newbies]     [x86 Platform Driver]     [Netdev]     [Linux Wireless]     [Netfilter]     [Bugtraq]     [Linux Filesystems]     [Yosemite Discussion]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Device Mapper]

  Powered by Linux