tree 10c3dca3e50bdc1f58f025f02cd85a2bfd8d3420
parent 9508c6b90b3f57ecea4e7a896cf8325400fc0c6e
author Minchan Kim <minchan@kernel.org> 1382937990 +0900
committer Phillip Lougher <phillip@squashfs.org.uk> 1384918518 +0000

squashfs: Enhance parallel I/O

Now squashfs have used for only one stream buffer for decompression
so it hurts parallel read performance so this patch supports
multiple decompressor to enhance performance parallel I/O.

Four 1G file dd read on KVM machine which has 2 CPU and 4G memory.

dd if=test/test1.dat of=/dev/null &
dd if=test/test2.dat of=/dev/null &
dd if=test/test3.dat of=/dev/null &
dd if=test/test4.dat of=/dev/null &

old : 1m39s -> new : 9s

* From v1
  * Change comp_strm with decomp_strm - Phillip
  * Change/add comments - Phillip

Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>