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
..
acpi
asm-generic	powerpc updates for 5.5 #2	2019-12-06 13:36:31 -08:00
clocksource
crypto
drm
dt-bindings	ARM: Device-tree updates	2019-12-05 12:09:47 -08:00
keys
kunit
kvm
linux	mm/memory_hotplug: shrink zones when offlining memory	2020-01-04 13:55:08 -08:00
math-emu
media
misc
net	net/sched: add delete_empty() to filters and use it in cls_flower	2019-12-30 20:35:19 -08:00
pcmcia
ras
rdma	IB/core: Introduce rdma_user_mmap_entry_insert_range() API	2019-12-12 16:55:36 -05:00
scsi
soc	drm msm + fixes for 5.5-rc1	2019-12-06 10:28:09 -08:00
sound	ASoC: Fixes for v5.5	2019-12-17 14:18:32 +01:00
target
trace	This is a relatively quiet cycle for nfsd, mainly various bugfixes.	2019-12-07 16:56:00 -08:00
uapi	kcov: fix struct layout for kcov_remote_arg	2020-01-04 13:55:09 -08:00
vdso	lib/vdso: Add unlikely() hint into vdso_read_begin()	2020-01-14 12:20:47 +01:00
video
xen	xen/interface: re-define FRONT/BACK_RING_ATTACH()	2019-12-20 13:44:42 +01:00