Re: [PATCHv24 00/16] Contiguous Memory Allocator

From: cary.zou
Date: Thu Apr 12 2012 - 08:40:28 EST

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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