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mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-24 05:04:00 +08:00
linux-next/arch/powerpc
Nicholas Piggin bdcb1aefc5 powerpc/64s: Improve RFI L1-D cache flush fallback
The fallback RFI flush is used when firmware does not provide a way
to flush the cache. It's a "displacement flush" that evicts useful
data by displacing it with an uninteresting buffer.

The flush has to take care to work with implementation specific cache
replacment policies, so the recipe has been in flux. The initial
slow but conservative approach is to touch all lines of a congruence
class, with dependencies between each load. It has since been
determined that a linear pattern of loads without dependencies is
sufficient, and is significantly faster.

Measuring the speed of a null syscall with RFI fallback flush enabled
gives the relative improvement:

P8 - 1.83x
P9 - 1.75x

The flush also becomes simpler and more adaptable to different cache
geometries.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-23 16:16:33 +11:00
..
boot powerpc/boot/dts: Remove leading 0x and 0s from bindings notation 2018-01-21 23:37:45 +11:00
configs powerpc: Add aacraid and nvme to powernv_defconfig 2018-01-16 23:47:15 +11:00
crypto License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
include powerpc/64s: Improve RFI L1-D cache flush fallback 2018-01-23 16:16:33 +11:00
kernel powerpc/64s: Improve RFI L1-D cache flush fallback 2018-01-23 16:16:33 +11:00
kvm powerpc: Use octal numbers for file permissions 2018-01-22 05:48:33 +11:00
lib Merge branch 'fixes' into next 2018-01-21 23:21:14 +11:00
math-emu License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mm powerpc/radix: Remove trace_tlbie call from radix__flush_tlb_all 2018-01-22 05:48:35 +11:00
net powerpc updates for 4.15 2017-11-16 12:47:46 -08:00
oprofile treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
perf Merge branch 'fixes' into next 2018-01-21 23:21:14 +11:00
platforms powerpc/pseries, ps3: panic flush kernel messages before halting system 2018-01-22 11:44:24 +11:00
purgatory License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sysdev powerpc: Use octal numbers for file permissions 2018-01-22 05:48:33 +11:00
tools License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xmon powerpc/64s: Improve RFI L1-D cache flush fallback 2018-01-23 16:16:33 +11:00
Kconfig Merge branch 'fixes' into next 2018-01-21 23:21:14 +11:00
Kconfig.debug powerpc: Add new kconfig CONFIG_PPC_IRQ_SOFT_MASK_DEBUG 2018-01-19 22:37:03 +11:00
Makefile powerpc/modules: Fix alignment of .toc section in kernel modules 2017-12-11 13:03:35 +11:00
Makefile.postlink License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00