linux-kernel - [PATCH v3] mm: cma: indefinitely retry allocations in cma

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Message-Id: <cover.1600922611.git.cgoldswo@codeaurora.org>
Date:   Wed, 23 Sep 2020 22:16:24 -0700
From:   Chris Goldsworthy <cgoldswo@...eaurora.org>
To:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        pratikp@...eaurora.org, pdaly@...eaurora.org,
        sudaraja@...eaurora.org, iamjoonsoo.kim@....com, david@...hat.com
Cc:     Chris Goldsworthy <cgoldswo@...eaurora.org>
Subject: [PATCH v3] mm: cma: indefinitely retry allocations in cma_alloc

V1: Introduces a retry loop that attempts a CMA allocation a finite
number of times before giving up:
 
https://lkml.org/lkml/2020/8/5/1097
https://lkml.org/lkml/2020/8/11/893

V2: Introduces an indefinite retry for CMA allocations.  David Hildenbrand
raised a page pinning example which precludes doing this infite-retrying
for all CMA users:

https://lkml.org/lkml/2020/9/17/984

V3: Re-introduce a GFP mask argument for cma_alloc(), that can take in
__GFP_NOFAIL as an argument to indicate that a CMA allocation should be
retried indefinitely. This lets callers of cma_alloc() decide if they want
to perform indefinite retires. Also introduces a config option for
controlling the duration of the sleep between retries.

Chris Goldsworthy (1):
  mm: cma: indefinitely retry allocations in cma_alloc

 arch/powerpc/kvm/book3s_hv_builtin.c       |  2 +-
 drivers/dma-buf/heaps/cma_heap.c           |  2 +-
 drivers/s390/char/vmcp.c                   |  2 +-
 drivers/staging/android/ion/ion_cma_heap.c |  2 +-
 include/linux/cma.h                        |  2 +-
 kernel/dma/contiguous.c                    |  4 ++--
 mm/Kconfig                                 | 11 ++++++++++
 mm/cma.c                                   | 35 +++++++++++++++++++++++++-----
 mm/cma_debug.c                             |  2 +-
 mm/hugetlb.c                               |  4 ++--
 10 files changed, 50 insertions(+), 16 deletions(-)

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