Re: [PATCH v2 3/3] vfs: Enable list batching for the superblock's inode list

[Andi Kleen]

> I'm wondering, why are inode_sb_list_add()/del() even called for a presumably 
> reasonably well cached benchmark running on a system with enough RAM? Are these 
> perhaps thousands of temporary files, already deleted, and released when all the 
> file descriptors are closed as part of sys_exit()?
> 
> If that's the case then I suspect an even bigger win would be not just to batch 
> the (sb-)global list fiddling, but to potentially turn the sb list into a 
> percpu_alloc() managed set of per CPU lists? It's a bigger change, but it could 

We had such a patch in the lock elision patchkit (It avoided a lot
of cache line bouncing leading to aborts)

https://git.kernel.org/cgit/linux/kernel/git/ak/linux-misc.git/commit/?h=hle315/combined&id=f1cf9e715a40f44086662ae3b29f123cf059cbf4

-Andi