Re: [PATCH 3/3] mm, thp: make swapin readahead under down_read of mmap_sem

On Mon, 2016-05-23 at 20:42 +0200, Michal Hocko wrote:

On Mon 23-05-16 20:14:11, Ebru Akagunduz wrote:

quoted

Currently khugepaged makes swapin readahead under
down_write. This patch supplies to make swapin
readahead under down_read instead of down_write.

You are still keeping down_write. Can we do without it altogether?
Blocking mmap_sem of a remote proces for write is certainly not nice.

Maybe Andrea can explain why khugepaged requires
a down_write of mmap_sem?

If it were possible to have just down_read that
would make the code a lot simpler.

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