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msm: kgsl: Optimize the vmap step size in kgsl page allocator
In the kgsl page allocator, the vmap step size is the number
of pages we map into vmalloc space once in order to memset 0
the allocation. Till now, the step size was 1/8th the vmalloc
space. This has one side-effect - other applications in the
system might starve due to lack of vmalloc space.
We conducted experiments with the goal to reduce the step
size while not hurting performance, and arrived at step size
of 2MB.
Bug: 21997649
Change-Id: I6bab8482edb7793cecf7e19e76bc359d308ddd8e
Signed-off-by:
Harshdeep Dhatt <hdhatt@codeaurora.org>
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