tree 03a6146c22473beb13e2ebda605d6a332ddb758b
parent cd59c2ec5f37a2bc1315c9324aab6c21d43ffa1a
author Phillip Lougher <phillip@squashfs.org.uk> 1384741896 +0000
committer Phillip Lougher <phillip@squashfs.org.uk> 1384919883 +0000

Squashfs: add multi-threaded decompression using percpu variable

Add a multi-threaded decompression implementation which uses
percpu variables.

Using percpu variables has advantages and disadvantages over
implementations which do not use percpu variables.

Advantages:
  * the nature of percpu variables ensures decompression is
    load-balanced across the multiple cores.
  * simplicity.

Disadvantages: it limits decompression to one thread per core.

Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>