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linux/drivers/hv
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Vitaly Kuznetsov 3e2d94535a clocksource/drivers/hyperv: Enable TSC page clocksource on 32bit 
There is no particular reason to not enable TSC page clocksource on
32-bit. mul_u64_u64_shr() is available and despite the increased
computational complexity (compared to 64bit) TSC page is still a huge win
compared to MSR-based clocksource.

In-kernel reads:
  MSR based clocksource: 3361 cycles
  TSC page clocksource: 49 cycles

Reads from userspace (utilizing vDSO in case of TSC page):
  MSR based clocksource: 5664 cycles
  TSC page clocksource: 131 cycles

Enabling TSC page on 32bits allows to get rid of CONFIG_HYPERV_TSCPAGE as
it is now not any different from CONFIG_HYPERV_TIMER.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lkml.kernel.org/r/20190822083630.17059-1-vkuznets@redhat.com
2019-08-23 16:59:54 +02:00
..
channel_mgmt.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 320 2019-06-05 17:37:05 +02:00
channel.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 320 2019-06-05 17:37:05 +02:00
connection.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 320 2019-06-05 17:37:05 +02:00
hv_balloon.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 280 2019-06-05 17:36:36 +02:00
hv_fcopy.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 280 2019-06-05 17:36:36 +02:00
hv_kvp.c Merge 4.20-rc4 into char-misc-next 2018-11-26 07:50:56 +01:00
hv_snapshot.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 280 2019-06-05 17:36:36 +02:00
hv_trace_balloon.h hv_balloon: trace post_status 2018-03-06 09:57:17 -08:00
hv_trace.c hv: add SPDX license to trace 2018-03-28 13:24:56 +02:00
hv_trace.h hv: add SPDX license to trace 2018-03-28 13:24:56 +02:00
hv_util.c clocksource/drivers: Continue making Hyper-V clocksource ISA agnostic 2019-07-03 11:00:59 +02:00
hv_utils_transport.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 280 2019-06-05 17:36:36 +02:00
hv_utils_transport.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 280 2019-06-05 17:36:36 +02:00
hv.c clocksource/drivers: Make Hyper-V clocksource ISA agnostic 2019-07-03 11:00:59 +02:00
hyperv_vmbus.h clocksource/drivers: Make Hyper-V clocksource ISA agnostic 2019-07-03 11:00:59 +02:00
Kconfig clocksource/drivers/hyperv: Enable TSC page clocksource on 32bit 2019-08-23 16:59:54 +02:00
Makefile hv_balloon: trace post_status 2018-03-06 09:57:17 -08:00
ring_buffer.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 320 2019-06-05 17:37:05 +02:00
vmbus_drv.c proc/sysctl: add shared variables for range check 2019-07-18 17:08:07 -07:00