tree c8d83c220af819958a27383a47f933764ec30a9d
parent 51c7cad7e8c033cdae5056125011aa3df1fa3e96
author Yabin Cui <yabinc@google.com> 1579822415 -0800
committer Yabin Cui <yabinc@google.com> 1579822750 -0800

simpleperf: avoid getting event name in EventFd::OpenEventFd.

GetEventNameByAttr() uses linear search and is slow. Using it
in EventFd::OpenEventFd() has visible effects in cmds like
`stat --per-thread -a`. So don't use it in EventFd::OpenEventFd().
Instead, pass event_name as a parameter.

Bug: 146220391
Test: run simpleperf_unit_test.
Change-Id: Ie7fde5add3c8f20d110916cc280a9c5d4077417f