Eric Lee / smarc-fsl-linux-kernel

28 Feb, 2013

1 commit

  • ac2e5327a   block/partitions: optimize memory allocation in check_partition() ... Browse Code »

    Currently, sizeof(struct parsed_partitions) may be 64KB in 32bit arch, so
    it is easy to trigger page allocation failure by check_partition,
    especially in hotplug block device situation(such as, USB mass storage,
    MMC card, ...), and Felipe Balbi has observed the failure.

    This patch does below optimizations on the allocation of struct
    parsed_partitions to try to address the issue:

    - make parsed_partitions.parts as pointer so that the pointed memory can
    fit in 32KB buffer, then approximate 32KB memory can be saved

    - vmalloc the buffer pointed by parsed_partitions.parts because 32KB is
    still a bit big for kmalloc

    - given that many devices have the partition count limit, so only
    allocate disk_max_parts() partitions instead of 256 partitions always

    Signed-off-by: Ming Lei
    Reported-by: Felipe Balbi
    Cc: Jens Axboe
    Reviewed-by: Yasuaki Ishimatsu
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Ming Lei
     

04 Jan, 2012

2 commits