ION: Sys_heap: Add cached pool to spead up cached buffer alloc

Add ion cached pool in system heap. This patch add a cached pool
in system heap. It has a great improvement of alloc for cached
buffer.

With memory pressue alloc test 800MB in userspace used iontest.
The result avg is 577ms. Without patch it's avg is about 883ms.

v1: Makes the cached buffer zeroed before going to pool
v2: Add cached param in pool to distinguish wheather need to flush
    cache at a fresh alloc.
    Rework the shrink function.

Signed-off-by: Chen Feng <[email protected]>
Signed-off-by: Xia  Qing <[email protected]>
Reviewed-by: Fu Jun <[email protected]>
Acked-by: Laura Abbott <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

0 files changed, 0 insertions, 0 deletions