linux-kernel - [PATCH 0/2] Increasing CMA Utilization with a GFP Flag

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Date:   Mon,  2 Nov 2020 06:39:20 -0800
From:   Chris Goldsworthy <cgoldswo@...eaurora.org>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Minchan Kim <minchan@...nel.org>,
        Nitin Gupta <ngupta@...are.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Chris Goldsworthy <cgoldswo@...eaurora.org>
Subject: [PATCH 0/2] Increasing CMA Utilization with a GFP Flag

The current approach to increasing CMA utilization introduced in
commit 16867664936e ("mm,page_alloc,cma: conditionally prefer cma
pageblocks for movable allocations") increases CMA utilization by
redirecting MIGRATE_MOVABLE allocations to a CMA region, when
greater than half of the free pages in a given zone are CMA pages.
The issue in this approach is that allocations with type
MIGRATE_MOVABLE can still succumb to pinning. To get around
this, one approach is to re-direct allocations to the CMA areas, that
are known not to be victims of pinning.

To this end, this series brings in __GFP_CMA, which we mark with
allocations that we know are safe to be redirected to a CMA area.

Heesub Shin (1):
  cma: redirect page allocation to CMA

Vinayak Menon (1):
  zram: allow zram to allocate CMA pages

 drivers/block/zram/zram_drv.c |  5 +--
 include/linux/gfp.h           | 15 ++++++++
 include/linux/highmem.h       |  4 ++-
 include/linux/mmzone.h        |  4 +++
 mm/page_alloc.c               | 83 +++++++++++++++++++++++++++----------------
 mm/zsmalloc.c                 |  4 +--
 6 files changed, 79 insertions(+), 36 deletions(-)

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