Re: [PATCH] blockgroup_lock: hashed spinlocks for ext2 and ext3

[Andi Kleen]

> per_cpu data is statically allocated, at compile-time.  And it doesn't work
> for modules.
> 
> These hashed locks need to be dynamically allocated (one per filesystem) and
> they need to work from modules.

Ok.

> 
> And this hashed lock is not a per-cpu thing.  (No locks are!) It just uses
> NR_CPUS to decide how big the hash should be.

Isn't that what the IBM kmalloc_per_cpu() was for ? (I think the patch
was from Dipankar) 

-Andi