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Re: [PATCHv24 00/16] Contiguous Memory Allocator



Hello all,
I'm using CMA to malloc contiguous memory, and I have following failure:

__alloc_contig_migrate_range: test_pages_isolated(3bc00, 3c000) failed

I try to dump_page, it shows:

page:81778620 count:1 mapcount:0 mapping: (null) index:0x88b
page flags: 0x40000000()

since I am not familiar with mm, can someone give me some hint on this
failure?




于 2012年04月03日 22:10, Marek Szyprowski 写道:
> Hi,
>
> This is (yet another) update of CMA patches. I've rebased them onto
> recent v3.4-rc1 kernel tree and integrated some minor bugfixes. The
> first issue has been pointed by Sandeep Patil - alloc_contig_range
> reclaimed two times too many pages, second issue (possible mismatch
> between pageblock size and MAX_ORDER pages) has been recently spotted
> by Michal Nazarewicz.
>
> These patches are also available on my git repository:
> git://git.linaro.org/people/mszyprowski/linux-dma-mapping.git 3.4-rc1-cma-v24
>
> Best regards
> Marek Szyprowski
> Samsung Poland R&D Center
>
> Links to previous versions of the patchset:
> v23: <http://www.spinics.net/lists/linux-media/msg44547.html>
> v22: <http://www.spinics.net/lists/linux-media/msg44370.html>
> v21: <http://www.spinics.net/lists/linux-media/msg44155.html>
> v20: <http://www.spinics.net/lists/linux-mm/msg29145.html>
> v19: <http://www.spinics.net/lists/linux-mm/msg29145.html>
> v18: <http://www.spinics.net/lists/linux-mm/msg28125.html>
> v17: <http://www.spinics.net/lists/arm-kernel/msg148499.html>
> v16: <http://www.spinics.net/lists/linux-mm/msg25066.html>
> v15: <http://www.spinics.net/lists/linux-mm/msg23365.html>
> v14: <http://www.spinics.net/lists/linux-media/msg36536.html>
> v13: (internal, intentionally not released)
> v12: <http://www.spinics.net/lists/linux-media/msg35674.html>
> v11: <http://www.spinics.net/lists/linux-mm/msg21868.html>
> v10: <http://www.spinics.net/lists/linux-mm/msg20761.html>
>  v9: <http://article.gmane.org/gmane.linux.kernel.mm/60787>
>  v8: <http://article.gmane.org/gmane.linux.kernel.mm/56855>
>  v7: <http://article.gmane.org/gmane.linux.kernel.mm/55626>
>  v6: <http://article.gmane.org/gmane.linux.kernel.mm/55626>
>  v5: (intentionally left out as CMA v5 was identical to CMA v4)
>  v4: <http://article.gmane.org/gmane.linux.kernel.mm/52010>
>  v3: <http://article.gmane.org/gmane.linux.kernel.mm/51573>
>  v2: <http://article.gmane.org/gmane.linux.kernel.mm/50986>
>  v1: <http://article.gmane.org/gmane.linux.kernel.mm/50669>
>
>
> Changelog:
>
> v24:
>     1. fixed handling of diffrent sizes of pageblock and MAX_ORDER size
>        pages
>
>     2. fixed number of the reclaimed pages before performing the allocation
>        (thanks to Sandeep Patil for pointing this issue)
>
>     3. rebased onto Linux v3.4-rc1
>
> v23:
>     1. fixed bug spotted by Aaro Koskinen (incorrect check inside VM_BUG_ON)
>
>     2. rebased onto next-20120222 tree from
>        git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 
>
> v22:
>     1. Fixed compilation break caused by missing fixup patch in v21
>
>     2. Fixed typos in the comments
>
>     3. Removed superfluous #include entries
>
> v21:
>     1. Fixed incorrect check which broke memory compaction code
>
>     2. Fixed hacky and racy min_free_kbytes handling
>
>     3. Added serialization patch to watermark calculation
>
>     4. Fixed typos here and there in the comments
>
> v20 and earlier - see previous patchsets.
>
>
> Patches in this patchset:
>
> Marek Szyprowski (6):
>   mm: extract reclaim code from __alloc_pages_direct_reclaim()
>   mm: trigger page reclaim in alloc_contig_range() to stabilise
>     watermarks
>   drivers: add Contiguous Memory Allocator
>   X86: integrate CMA with DMA-mapping subsystem
>   ARM: integrate CMA with DMA-mapping subsystem
>   ARM: Samsung: use CMA for 2 memory banks for s5p-mfc device
>
> Mel Gorman (1):
>   mm: Serialize access to min_free_kbytes
>
> Michal Nazarewicz (9):
>   mm: page_alloc: remove trailing whitespace
>   mm: compaction: introduce isolate_migratepages_range()
>   mm: compaction: introduce map_pages()
>   mm: compaction: introduce isolate_freepages_range()
>   mm: compaction: export some of the functions
>   mm: page_alloc: introduce alloc_contig_range()
>   mm: page_alloc: change fallbacks array handling
>   mm: mmzone: MIGRATE_CMA migration type added
>   mm: page_isolation: MIGRATE_CMA isolation functions added
>
>  Documentation/kernel-parameters.txt   |    9 +
>  arch/Kconfig                          |    3 +
>  arch/arm/Kconfig                      |    2 +
>  arch/arm/include/asm/dma-contiguous.h |   15 ++
>  arch/arm/include/asm/mach/map.h       |    1 +
>  arch/arm/kernel/setup.c               |    9 +-
>  arch/arm/mm/dma-mapping.c             |  370 ++++++++++++++++++++++++------
>  arch/arm/mm/init.c                    |   23 ++-
>  arch/arm/mm/mm.h                      |    3 +
>  arch/arm/mm/mmu.c                     |   31 ++-
>  arch/arm/plat-s5p/dev-mfc.c           |   51 +----
>  arch/x86/Kconfig                      |    1 +
>  arch/x86/include/asm/dma-contiguous.h |   13 +
>  arch/x86/include/asm/dma-mapping.h    |    4 +
>  arch/x86/kernel/pci-dma.c             |   18 ++-
>  arch/x86/kernel/pci-nommu.c           |    8 +-
>  arch/x86/kernel/setup.c               |    2 +
>  drivers/base/Kconfig                  |   89 +++++++
>  drivers/base/Makefile                 |    1 +
>  drivers/base/dma-contiguous.c         |  401 +++++++++++++++++++++++++++++++
>  include/asm-generic/dma-contiguous.h  |   28 +++
>  include/linux/device.h                |    4 +
>  include/linux/dma-contiguous.h        |  110 +++++++++
>  include/linux/gfp.h                   |   12 +
>  include/linux/mmzone.h                |   47 +++-
>  include/linux/page-isolation.h        |   18 +-
>  mm/Kconfig                            |    2 +-
>  mm/Makefile                           |    3 +-
>  mm/compaction.c                       |  418 +++++++++++++++++++++------------
>  mm/internal.h                         |   33 +++
>  mm/memory-failure.c                   |    2 +-
>  mm/memory_hotplug.c                   |    6 +-
>  mm/page_alloc.c                       |  409 ++++++++++++++++++++++++++++----
>  mm/page_isolation.c                   |   15 +-
>  mm/vmstat.c                           |    3 +
>  35 files changed, 1791 insertions(+), 373 deletions(-)
>  create mode 100644 arch/arm/include/asm/dma-contiguous.h
>  create mode 100644 arch/x86/include/asm/dma-contiguous.h
>  create mode 100644 drivers/base/dma-contiguous.c
>  create mode 100644 include/asm-generic/dma-contiguous.h
>  create mode 100644 include/linux/dma-contiguous.h
>


-- 
B.R
Cary Zou

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