On 05/24/2018 08:52 AM, Vlastimil Babka wrote:

On 05/24/2018 02:13 PM, Roman Gushchin wrote:

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On Thu, May 24, 2018 at 01:00:06PM +0200, Vlastimil Babka wrote:

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Hi,

- I haven't find any other obvious users for reclaimable kmalloc (yet)

As I remember, ION memory allocator was discussed related to this theme:
https://lkml.org/lkml/2018/4/24/1288

+CC Laura

Yeah ION added the NR_INDIRECTLY_RECLAIMABLE_BYTES handling, which is
adjusted to page granularity in patch 4. I'm not sure if it should use
kmalloc as it seems to be allocating order-X pages, where kmalloc/slab
just means extra overhead. But maybe if it doesn't allocate/free too
frequently, it could work?

The page pool allocation is supposed to be a slow path but it's
one I'd rather not have too much overhead. It also just looks really odd
to be allocating higher order pages via kmalloc imho.
  

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I did a superset as IIRC somebody suggested that in the older threads or at LSF.

This looks nice to me!

Thanks!