Andrei Vagin 0898a16a36 lib/vdso: Add unlikely() hint into vdso_read_begin() ... Place the branch with no concurrent write before the contended case. Performance numbers for Intel(R) Core(TM) i5-6300U CPU @ 2.40GHz (more clock_gettime() cycles - the better): | before | after ----------------------------------- | 150252214 | 153242367 | 150301112 | 153324800 | 150392773 | 153125401 | 150373957 | 153399355 | 150303157 | 153489417 | 150365237 | 153494270 ----------------------------------- avg | 150331408 | 153345935 diff % | 2 | 0 ----------------------------------- stdev % | 0.3 | 0.1 Co-developed-by: Dmitry Safonov <dima@arista.com> Signed-off-by: Andrei Vagin <avagin@gmail.com> Signed-off-by: Dmitry Safonov <dima@arista.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Link: https://lore.kernel.org/r/20191112012724.250792-2-dima@arista.com		2020-01-14 12:20:47 +01:00
..
datapage.h	vdso: Remove superfluous #ifdef __KERNEL__ in vdso/datapage.h	2019-06-26 07:28:09 +02:00
helpers.h	lib/vdso: Add unlikely() hint into vdso_read_begin()	2020-01-14 12:20:47 +01:00
vsyscall.h	timekeeping: Provide a generic update_vsyscall() implementation	2019-06-22 21:21:06 +02:00