Remove unnecessary locking in fs
osFs.acquire and osFs.release are surprisingly expensive, using a
combined 345.7s of runtime in an AOSP aosp_cf_x86_64_phone-userdebug
build. They are used to ensure we don't use too many simultaneous
open files, but many of the functions they are called from don't
actually open a file. Remove them from all the stat-based functions
(Exists, IsDir, IsSymlink, Lstat, Stat), and from ReadLink. After
this change the time spent in acquire and release is effectively
zero.
Test: SOONG_PROFILE_CPU=/tmp/cpu.pprof m nothing
Change-Id: Ie5e22e33c61794354821f05ab79ceb4efc3b276c
1 file changed
