Re: [RFC v2 09/14] mm: Support order-1 folios in the page cache

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On 2/13/24 10:37, Pankaj Raghav (Samsung) wrote:
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>

Folios of order 1 have no space to store the deferred list.  This is
not a problem for the page cache as file-backed folios are never
placed on the deferred list.  All we need to do is prevent the core
MM from touching the deferred list for order 1 folios and remove the
code which prevented us from allocating order 1 folios.

Link: https://lore.kernel.org/linux-mm/90344ea7-4eec-47ee-5996-0c22f42d6a6a@xxxxxxxxxx/
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
  include/linux/huge_mm.h |  7 +++++--
  mm/filemap.c            |  2 --
  mm/huge_memory.c        | 23 ++++++++++++++++++-----
  mm/internal.h           |  4 +---
  mm/readahead.c          |  3 ---
  5 files changed, 24 insertions(+), 15 deletions(-)

Reviewed-by: Hannes Reinecke <hare@xxxxxxx>

Cheers,

Hannes






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