[igt-dev] [PATCH i-g-t] lib: Purge os caches twice for good luck

[Chris Wilson]

Quoting Chris Wilson (2018-06-15 14:32:49)
> If at first we don't succeed, try, try again.
> 
> References: https://bugs.freedesktop.org/show_bug.cgi?id=105967
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

A few runs each not showing the gem_exec_gttfill. Hard to be conclusive,
but it does suggest that the extra pass at flushing the caches helps.
-Chris