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| author | Palmer Dabbelt <palmer@rivosinc.com> | 2024-03-14 09:24:37 -0700 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2024-03-20 08:56:13 -0700 |
| commit | eeb7a8933e71f98354536c3d849a26978539b09f (patch) | |
| tree | ed86e64f3f0630cfaad02a360fe731f80e8f1889 /drivers/cpufreq/Kconfig.arm | |
| parent | 2b2ca354674bed0d0222ce1426d2d45b065ac1e8 (diff) | |
| parent | cd6c916ccf21bb4c16367493541192e0f3a19278 (diff) | |
| download | linux-eeb7a8933e71f98354536c3d849a26978539b09f.tar.gz | |
Merge patch series "riscv: mm: Extend mappable memory up to hint address"
Charlie Jenkins <charlie@rivosinc.com> says:
On riscv, mmap currently returns an address from the largest address
space that can fit entirely inside of the hint address. This makes it
such that the hint address is almost never returned. This patch raises
the mappable area up to and including the hint address. This allows mmap
to often return the hint address, which allows a performance improvement
over searching for a valid address as well as making the behavior more
similar to other architectures.
Note that a previous patch introduced stronger semantics compared to
other architectures for riscv mmap. On riscv, mmap will not use bits in
the upper bits of the virtual address depending on the hint address. On
other architectures, a random address is returned in the address space
requested. On all architectures the hint address will be returned if it
is available. This allows riscv applications to configure how many bits
in the virtual address should be left empty. This has the two benefits
of being able to request address spaces that are smaller than the
default and doesn't require the application to know the page table
layout of riscv.
* b4-shazam-merge:
docs: riscv: Define behavior of mmap
selftests: riscv: Generalize mm selftests
riscv: mm: Use hint address in mmap if available
Link: https://lore.kernel.org/r/20240130-use_mmap_hint_address-v3-0-8a655cfa8bcb@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'drivers/cpufreq/Kconfig.arm')
| -rw-r--r-- | drivers/cpufreq/Kconfig.arm | 26 |
1 files changed, 0 insertions, 26 deletions
diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm index f911606897b8d1..987b3d900a89b8 100644 --- a/drivers/cpufreq/Kconfig.arm +++ b/drivers/cpufreq/Kconfig.arm @@ -3,32 +3,6 @@ # ARM CPU Frequency scaling drivers # -config ACPI_CPPC_CPUFREQ - tristate "CPUFreq driver based on the ACPI CPPC spec" - depends on ACPI_PROCESSOR - select ACPI_CPPC_LIB - help - This adds a CPUFreq driver which uses CPPC methods - as described in the ACPIv5.1 spec. CPPC stands for - Collaborative Processor Performance Controls. It - is based on an abstract continuous scale of CPU - performance values which allows the remote power - processor to flexibly optimize for power and - performance. CPPC relies on power management firmware - support for its operation. - - If in doubt, say N. - -config ACPI_CPPC_CPUFREQ_FIE - bool "Frequency Invariance support for CPPC cpufreq driver" - depends on ACPI_CPPC_CPUFREQ && GENERIC_ARCH_TOPOLOGY - default y - help - This extends frequency invariance support in the CPPC cpufreq driver, - by using CPPC delivered and reference performance counters. - - If in doubt, say N. - config ARM_ALLWINNER_SUN50I_CPUFREQ_NVMEM tristate "Allwinner nvmem based SUN50I CPUFreq driver" depends on ARCH_SUNXI |