Add microbenchmarks/memory-eater.
This benchmark measures ZRAM page-in throughput and can be used
as a utility to create background memory pressure too.
BUG=chromium:788276
TEST=emerge-${BOARD} microbenchmarks
CQ-DEPEND=CL:*529118
Change-Id: I27057b12dfadd2bac2e449a65fd6e1f4fce8f07a
Reviewed-on: https://chromium-review.googlesource.com/826907
Commit-Ready: Ben Cheng <[email protected]>
Tested-by: Ben Cheng <[email protected]>
Reviewed-by: Cheng-Yu Lee <[email protected]>
Reviewed-by: Chung-yih Wang <[email protected]>