Eric Lee / smarc-fsl-linux-kernel

27 Apr, 2010

1 commit

  • afc24d49c   blk-cgroup: config options re-arrangement ... Browse Code »

    This patch fixes few usability and configurability issues.

    o All the cgroup based controller options are configurable from
    "Genral Setup/Control Group Support/" menu. blkio is the only exception.
    Hence make this option visible in above menu and make it configurable from
    there to bring it inline with rest of the cgroup based controllers.

    o Get rid of CONFIG_DEBUG_CFQ_IOSCHED.

    This option currently does two things.

    - Enable printing of cgroup paths in blktrace
    - Enables CONFIG_DEBUG_BLK_CGROUP, which in turn displays additional stat
    files in cgroup.

    If we are using group scheduling, blktrace data is of not really much use
    if cgroup information is not present. To get this data, currently one has to
    also enable CONFIG_DEBUG_CFQ_IOSCHED, which in turn brings the overhead of
    all the additional debug stat files which is not desired.

    Hence, this patch moves printing of cgroup paths under
    CONFIG_CFQ_GROUP_IOSCHED.

    This allows us to get rid of CONFIG_DEBUG_CFQ_IOSCHED completely. Now all
    the debug stat files are controlled only by CONFIG_DEBUG_BLK_CGROUP which
    can be enabled through config menu.

    Signed-off-by: Vivek Goyal
    Acked-by: Divyesh Shah
    Reviewed-by: Gui Jianfeng
    Signed-off-by: Jens Axboe

    Vivek Goyal
     

13 Mar, 2010

1 commit

  • 67523c48a   cgroups: blkio subsystem as module ... Browse Code »

    Modify the Block I/O cgroup subsystem to be able to be built as a module.
    As the CFQ disk scheduler optionally depends on blk-cgroup, config options
    in block/Kconfig, block/Kconfig.iosched, and block/blk-cgroup.h are
    enhanced to support the new module dependency.

    Signed-off-by: Ben Blum
    Cc: Li Zefan
    Cc: Paul Menage
    Cc: "David S. Miller"
    Cc: KAMEZAWA Hiroyuki
    Cc: Lai Jiangshan
    Cc: Vivek Goyal
    Cc: Jens Axboe
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Ben Blum
     

04 Dec, 2009

5 commits

03 Oct, 2009

2 commits

18 Feb, 2007

1 commit

01 Oct, 2006

1 commit

  • 9361401eb   [PATCH] BLOCK: Make it possible to disable the block layer [try #6] ... Browse Code »

    Make it possible to disable the block layer. Not all embedded devices require
    it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
    the block layer to be present.

    This patch does the following:

    (*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
    support.

    (*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls
    an item that uses the block layer. This includes:

    (*) Block I/O tracing.

    (*) Disk partition code.

    (*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.

    (*) The SCSI layer. As far as I can tell, even SCSI chardevs use the
    block layer to do scheduling. Some drivers that use SCSI facilities -
    such as USB storage - end up disabled indirectly from this.

    (*) Various block-based device drivers, such as IDE and the old CDROM
    drivers.

    (*) MTD blockdev handling and FTL.

    (*) JFFS - which uses set_bdev_super(), something it could avoid doing by
    taking a leaf out of JFFS2's book.

    (*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and
    linux/elevator.h contingent on CONFIG_BLOCK being set. sector_div() is,
    however, still used in places, and so is still available.

    (*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and
    parts of linux/fs.h.

    (*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.

    (*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.

    (*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
    is not enabled.

    (*) fs/no-block.c is created to hold out-of-line stubs and things that are
    required when CONFIG_BLOCK is not set:

    (*) Default blockdev file operations (to give error ENODEV on opening).

    (*) Makes some /proc changes:

    (*) /proc/devices does not list any blockdevs.

    (*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.

    (*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.

    (*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if
    given command other than Q_SYNC or if a special device is specified.

    (*) In init/do_mounts.c, no reference is made to the blockdev routines if
    CONFIG_BLOCK is not defined. This does not prohibit NFS roots or JFFS2.

    (*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return
    error ENOSYS by way of cond_syscall if so).

    (*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if
    CONFIG_BLOCK is not set, since they can't then happen.

    Signed-Off-By: David Howells
    Signed-off-by: Jens Axboe

    David Howells
     

23 Jun, 2006

1 commit

04 Nov, 2005

2 commits