Re: [RFC PATCH] pmem: advertise page alignment for pmem devices supporting fsdax

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On Fri, Feb 22, 2019 at 10:20:08AM -0800, Darrick J. Wong wrote:
> Hi all!
> 
> Uh, we have an internal customer <cough> who's been trying out MAP_SYNC
> on pmem, and they've observed that one has to do a fair amount of
> legwork (in the form of mkfs.xfs parameters) to get the kernel to set up
> 2M PMD mappings.  They (of course) want to mmap hundreds of GB of pmem,
> so the PMD mappings are much more efficient.
> 
> I started poking around w.r.t. what mkfs.xfs was doing and realized that
> if the fsdax pmem device advertised iomin/ioopt of 2MB, then mkfs will
> set up all the parameters automatically.  Below is my ham-handed attempt
> to teach the kernel to do this.

What's the before and after mkfs output?

(need to see the context that this "fixes" before I comment)

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx



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