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On VM-based builders, the nvmem unittest was sometimes missing the 10-second deadline, likely being stuck in slow I/Os. Try to move the persistent storage files used for flash 'emulation' on host from the build directory to a RAM-backed filesystem in /dev/shm in order to mitigate this bottleneck. Store the new backing files in a path like: /dev/shm/EC_persist__mnt_host_source_src_platform_ec_build_host_nvmem_nvmem.exe_flash in order to keep the properties of the old system: subsequent runs of the same build will use the same persistent storage but 2 different trees won't mix up. Signed-off-by: Vincent Palatin <vpalatin@chromium.org> BRANCH=none BUG=chromium:715011 TEST=make runtests TEST=run the following command with and without this change: 'for i in 0 1 2 3 4 5 6 7 8 9 ; do time make run-nvmem ; done' and see the average test time around 500 ms without the change and around 320 ms with it on an idle and beefy workstation. Change-Id: Ic2ff6511b81869171efc484ca805f8c0d6008595 Reviewed-on: https://chromium-review.googlesource.com/893380 Commit-Ready: Vincent Palatin <vpalatin@chromium.org> Tested-by: Vincent Palatin <vpalatin@chromium.org> Reviewed-by: Vincent Palatin <vpalatin@chromium.org>