Changelog:
v1 - v2
Addressed comments from Marc Zyngier
I made early boot time stamps available for SPARC and X86.
x86:
https://lore.kernel.org/lkml/20180719205545.16512-1-pasha.tatas...@oracle.com
sparc:
https://www.spinics.net/lists/sparclinux/msg18063.html
As discussed at plumbers, I would like to add the same for arm64. The
implementation does not have to be perfect, and should work only when early
clock is easy to determine. arm64 defines a clock register, and thus makes
it easy, but on some platforms frequency register is broken, so if it is
not known, simply don't initialize clock early.
dmesg before:
https://paste.ubuntu.com/p/3pJ5kgJHyN
dmesg after:
https://paste.ubuntu.com/p/RHKGVd9nSM
As seen from the above with base smp_init is finished after 0.47s:
[ 0.464585] SMP: Total of 8 processors activated.
But, in reality, 3.2s is missing which is a quiet long considering this is
only 60G domain.
Pavel Tatashin (1):
arm64: Early boot time stamps
arch/arm64/kernel/setup.c | 25 +++++++++++++++++++++++++
drivers/clocksource/arm_arch_timer.c | 8 ++++----
include/clocksource/arm_arch_timer.h | 3 +++
3 files changed, 32 insertions(+), 4 deletions(-)
--
2.19.1
