Re: [PATCH v4 0/3] ext4: increase mbcache scalability

[Thavatchai Makphaibulchoke]

On 01/24/2014 11:09 PM, Andreas Dilger wrote:
> I think the ext4 block groups are locked with the blockgroup_lock that has about the same number of locks as the number of cores, with a max of 128, IIRC.  See blockgroup_lock.h. 
> 
> While there is some chance of contention, it is also unlikely that all of the cores are locking this area at the same time.  
> 
> Cheers, Andreas
> 



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