Files
kernel_google_b1c1/lib
Mark Salyzyn 6e00b188f7 STOPSHIP: vdso: disable switches for experiments
Permit vdso to be enabled or disabled at will to manage performance
experiments on the dogfood population.  Parameters are accessible
from user space at /sys/module/vdso/parameters/enable_{32|64}:

    enable_64=0 -> 64 bit vdso disabled
    enable_32=0 -> 32 bit vdso disabled

Overhead appears to be ~2ns to perform the checking on every call.

Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Test: manual, bionic-benchmarks --bionic_xml=vdso.xml to confirm.
Bug: 70518189
Change-Id: Ic0fefa61919c93ad809eb20c5a8c8c1590b4cfc3
2018-01-10 14:15:54 -08:00
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