tree d1421ba65d0328dc15d881d2908eded94851a5f7
parent b1b964214babaddd0f0bd758c54f7fac4fbe4bf7
author Rom Lemarchand <romlem@android.com> 1463455061 -0700
committer Rom Lemarchand <romlem@google.com> 1463455195 -0700

pagingtest: switch to advising random accesses

Switch to using madvise(MADV_RANDOM) and posix_fadvise(POSIX_FADV_RANDOM)
to disable caching as opposed to reading the file backwards, which still
went through some caching.

Measured a 80% drop in worst case performance after switching.

Change-Id: I03115dfb94ae7dfc58e0e187af3936c4e371817f