Eric Lee / smarc-uboot

07 May, 2018

1 commit

  • 83d290c56   SPDX: Convert all of our single license tags to Linux Kernel style ... Browse Code »
    56

    When U-Boot started using SPDX tags we were among the early adopters and
    there weren't a lot of other examples to borrow from. So we picked the
    area of the file that usually had a full license text and replaced it
    with an appropriate SPDX-License-Identifier: entry. Since then, the
    Linux Kernel has adopted SPDX tags and they place it as the very first
    line in a file (except where shebangs are used, then it's second line)
    and with slightly different comment styles than us.

    In part due to community overlap, in part due to better tag visibility
    and in part for other minor reasons, switch over to that style.

    This commit changes all instances where we have a single declared
    license in the tag as both the before and after are identical in tag
    contents. There's also a few places where I found we did not have a tag
    and have introduced one.

    Signed-off-by: Tom Rini

    Tom Rini
     

12 Apr, 2016

2 commits

02 Apr, 2016

1 commit

  • e40cf34a2   drivers: block: add block device cache ... Browse Code »

    Add a block device cache to speed up repeated reads of block devices by
    various filesystems.

    This small amount of cache can dramatically speed up filesystem
    operations by skipping repeated reads of common areas of a block
    device (typically directory structures).

    This has shown to have some benefit on FAT filesystem operations of
    loading a kernel and RAM disk, but more dramatic benefits on ext4
    filesystems when the kernel and/or RAM disk are spread across
    multiple extent header structures as described in commit fc0fc50.

    The cache is implemented through a minimal list (block_cache) maintained
    in most-recently-used order and count of the current number of entries
    (cache_count). It uses a maximum block count setting to prevent copies
    of large block reads and an upper bound on the number of cached areas.

    The maximum number of entries in the cache defaults to 32 and the maximum
    number of blocks per cache entry has a default of 2, which has shown to
    produce the best results on testing of ext4 and FAT filesystems.

    The 'blkcache' command (enabled through CONFIG_CMD_BLOCK_CACHE) allows
    changing these values and can be used to tune for a particular filesystem
    layout.

    Signed-off-by: Eric Nelson

    Eric Nelson