On Mon, Mar 28, 2016 at 10:05:44AM -0700, Eric Nelson wrote: > 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 <e...@nelint.com>
Applied to u-boot/master, thanks! -- Tom
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