20 Nov, 2013

2 commits

• 846b730e9   Squashfs: Generalise paging handling in the decompressors ... Browse Code »

  Further generalise the decompressors by adding a page handler
  abstraction. This adds helpers to allow the decompressors
  to access and process the output buffers in an implementation
  independant manner.

  This allows different types of output buffer to be passed
  to the decompressors, with the implementation specific
  aspects handled at decompression time, but without the
  knowledge being held in the decompressor wrapper code.

  This will allow the decompressors to handle Squashfs
  cache buffers, and page cache pages.

  This patch adds the abstraction and an implementation for
  the caches.

  Signed-off-by: Phillip Lougher
  Reviewed-by: Minchan Kim

  Phillip Lougher

  2013-11-20 11:59:01 +0800  
• d208383d6   Squashfs: add multi-threaded decompression using percpu variable ... Browse Code »

  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 Lougher

  2013-11-20 11:58:03 +0800