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    SubjectRe: [Linaro-mm-sig] [PATCHv23 00/16] Contiguous Memory Allocator
    2012/2/23 Marek Szyprowski <m.szyprowski@samsung.com>:
    > Hi,
    >
    > This is (yet another) quick update of CMA patches. I've rebased them
    > onto next-20120222 tree from
    > git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git and
    > fixed the bug pointed by Aaro Koskinen.

    For the whole series:

    Tested-by: Barry Song <Baohua.Song@csr.com>

    and i also write a simple kernel helper to test the CMA:

    /*
    * kernek module helper for testing CMA
    *
    * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
    *
    * Licensed under GPLv2 or later.
    */

    #include <linux/module.h>
    #include <linux/device.h>
    #include <linux/fs.h>
    #include <linux/miscdevice.h>
    #include <linux/dma-mapping.h>

    #define CMA_NUM 10
    static struct device *cma_dev;
    static dma_addr_t dma_phys[CMA_NUM];
    static void *dma_virt[CMA_NUM];

    /* any read request will free coherent memory, eg.
    * cat /dev/cma_test
    */
    static ssize_t
    cma_test_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
    {
    int i;

    for (i = 0; i < CMA_NUM; i++) {
    if (dma_virt[i]) {
    dma_free_coherent(cma_dev, (i + 1) * SZ_1M, dma_virt[i], dma_phys[i]);
    _dev_info(cma_dev, "free virt: %p phys: %p\n", dma_virt[i], (void
    *)dma_phys[i]);
    dma_virt[i] = NULL;
    break;
    }
    }
    return 0;
    }

    /*
    * any write request will alloc coherent memory, eg.
    * echo 0 > /dev/cma_test
    */
    static ssize_t
    cma_test_write(struct file *file, const char __user *buf, size_t
    count, loff_t *ppos)
    {
    int i;
    int ret;

    for (i = 0; i < CMA_NUM; i++) {
    if (!dma_virt[i]) {
    dma_virt[i] = dma_alloc_coherent(cma_dev, (i + 1) * SZ_1M,
    &dma_phys[i], GFP_KERNEL);

    if (dma_virt[i])
    _dev_info(cma_dev, "alloc virt: %p phys: %p\n", dma_virt[i], (void
    *)dma_phys[i]);
    else {
    dev_err(cma_dev, "no mem in CMA area\n");
    ret = -ENOMEM;
    }
    break;
    }
    }

    return count;
    }

    static const struct file_operations cma_test_fops = {
    .owner = THIS_MODULE,
    .read = cma_test_read,
    .write = cma_test_write,
    };

    static struct miscdevice cma_test_misc = {
    .name = "cma_test",
    .fops = &cma_test_fops,
    };

    static int __init cma_test_init(void)
    {
    int ret = 0;

    ret = misc_register(&cma_test_misc);
    if (unlikely(ret)) {
    pr_err("failed to register cma test misc device!\n");
    return ret;
    }
    cma_dev = cma_test_misc.this_device;
    cma_dev->coherent_dma_mask = ~0;
    _dev_info(cma_dev, "registered.\n");

    return ret;
    }
    module_init(cma_test_init);

    static void __exit cma_test_exit(void)
    {
    misc_deregister(&cma_test_misc);
    }
    module_exit(cma_test_exit);

    MODULE_LICENSE("GPL");
    MODULE_AUTHOR("Barry Song <Baohua.Song@csr.com>");
    MODULE_DESCRIPTION("kernel module to help the test of CMA");
    MODULE_ALIAS("CMA test");

    While fulfilling "dd if=/dev/mmcblk0 of=/dev/null bs=4096
    count=1024000000 &" and "dd if=/dev/zero of=/data/1 bs=4096
    count=1024000000 &" to exhaust memory at background,
    i alloc the contiguous memories using the cma_test driver:
    $echo 0 > /dev/cma_test
    [ 16.582216] misc cma_test: alloc virt: ceb00000 phys: 0eb00000
    $echo 0 > /dev/cma_test
    [ 20.843395] misc cma_test: alloc virt: cec00000 phys: 0ec00000
    $echo 0 > /dev/cma_test
    [ 21.774601] misc cma_test: alloc virt: cee00000 phys: 0ee00000
    $echo 0 > /dev/cma_test
    [ 22.925633] misc cma_test: alloc virt: cf100000 phys: 0f100000

    i did see the page write back is executed and contiguous memories are
    always available.

    P.S. the whole series was also back ported to 2.6.38.8 which our
    release is based on.

    >
    > Best regards
    > Marek Szyprowski
    > Samsung Poland R&D Center
    >
    > Links to previous versions of the patchset:
    > 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:
    >
    > 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             |  369 ++++++++++++++++++++++++------
    >  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, 1790 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
    >
    > --
    > 1.7.1.569.g6f426

    Thanks
    barry
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