@@ -1078,17 +1078,105 @@ config HAVE_ARCH_COMPAT_MMAP_BASES
and vice-versa 32-bit applications to call 64-bit mmap().
Required for applications doing different bitness syscalls.
+config HAVE_PAGE_SIZE_4KB
+ bool
+
+config HAVE_PAGE_SIZE_8KB
+ bool
+
+config HAVE_PAGE_SIZE_16KB
+ bool
+
+config HAVE_PAGE_SIZE_32KB
+ bool
+
+config HAVE_PAGE_SIZE_64KB
+ bool
+
+config HAVE_PAGE_SIZE_256KB
+ bool
+
+choice
+ prompt "MMU page size"
+
+config PAGE_SIZE_4KB
+ bool "4KiB pages"
+ depends on HAVE_PAGE_SIZE_4KB
+ help
+ This option select the standard 4KiB Linux page size and the only
+ available option on many architectures. Using 4KiB page size will
+ minimize memory consumption and is therefore recommended for low
+ memory systems.
+ Some software that is written for x86 systems makes incorrect
+ assumptions about the page size and only runs on 4KiB pages.
+
+config PAGE_SIZE_8KB
+ bool "8KiB pages"
+ depends on HAVE_PAGE_SIZE_8KB
+ help
+ This option is the only supported page size on a few older
+ processors, and can be slightly faster than 4KiB pages.
+
+config PAGE_SIZE_16KB
+ bool "16KiB pages"
+ depends on HAVE_PAGE_SIZE_16KB
+ help
+ This option is usually a good compromise between memory
+ consumption and performance for typical desktop and server
+ workloads, often saving a level of page table lookups compared
+ to 4KB pages as well as reducing TLB pressure and overhead of
+ per-page operations in the kernel at the expense of a larger
+ page cache.
+
+config PAGE_SIZE_32KB
+ bool "32KiB pages"
+ depends on HAVE_PAGE_SIZE_32KB
+ Using 32KiB page size will result in slightly higher performance
+ kernel at the price of higher memory consumption compared to
+ 16KiB pages. This option is available only on cnMIPS cores.
+ Note that you will need a suitable Linux distribution to
+ support this.
+
+config PAGE_SIZE_64KB
+ bool "64KiB pages"
+ depends on HAVE_PAGE_SIZE_64KB
+ Using 64KiB page size will result in slightly higher performance
+ kernel at the price of much higher memory consumption compared to
+ 4KiB or 16KiB pages.
+ This is not suitable for general-purpose workloads but the
+ better performance may be worth the cost for certain types of
+ supercomputing or database applications that work mostly with
+ large in-memory data rather than small files.
+
+config PAGE_SIZE_256KB
+ bool "256KiB pages"
+ depends on HAVE_PAGE_SIZE_256KB
+ help
+ 256KiB pages have little practical value due to their extreme
+ memory usage. The kernel will only be able to run applications
+ that have been compiled with '-zmax-page-size' set to 256KiB
+ (the default is 64KiB or 4KiB on most architectures).
+
+endchoice
+
config PAGE_SIZE_LESS_THAN_64KB
def_bool y
- depends on !ARM64_64K_PAGES
depends on !PAGE_SIZE_64KB
- depends on !PARISC_PAGE_SIZE_64KB
depends on PAGE_SIZE_LESS_THAN_256KB
config PAGE_SIZE_LESS_THAN_256KB
def_bool y
depends on !PAGE_SIZE_256KB
+config PAGE_SHIFT
+ int
+ default 12 if PAGE_SIZE_4KB
+ default 13 if PAGE_SIZE_8KB
+ default 14 if PAGE_SIZE_16KB
+ default 15 if PAGE_SIZE_32KB
+ default 16 if PAGE_SIZE_64KB
+ default 18 if PAGE_SIZE_256KB
+
# This allows to use a set of generic functions to determine mmap base
# address by giving priority to top-down scheme only if the process
# is not in legacy mode (compat task, unlimited stack size or
@@ -8,6 +8,10 @@ config HEXAGON
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select ARCH_NO_PREEMPT
select DMA_GLOBAL_POOL
+ select HAVE_PAGE_SIZE_4KB
+ select HAVE_PAGE_SIZE_16KB
+ select HAVE_PAGE_SIZE_64KB
+ select HAVE_PAGE_SIZE_256KB
# Other pending projects/to-do items.
# select HAVE_REGS_AND_STACK_ACCESS_API
# select HAVE_HW_BREAKPOINT if PERF_EVENTS
@@ -120,26 +124,6 @@ config NR_CPUS
This is purely to save memory - each supported CPU adds
approximately eight kilobytes to the kernel image.
-choice
- prompt "Kernel page size"
- default PAGE_SIZE_4KB
- help
- Changes the default page size; use with caution.
-
-config PAGE_SIZE_4KB
- bool "4KB"
-
-config PAGE_SIZE_16KB
- bool "16KB"
-
-config PAGE_SIZE_64KB
- bool "64KB"
-
-config PAGE_SIZE_256KB
- bool "256KB"
-
-endchoice
-
source "kernel/Kconfig.hz"
endmenu
@@ -13,27 +13,22 @@
/* This is probably not the most graceful way to handle this. */
#ifdef CONFIG_PAGE_SIZE_4KB
-#define PAGE_SHIFT 12
#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_4KB
#endif
#ifdef CONFIG_PAGE_SIZE_16KB
-#define PAGE_SHIFT 14
#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_16KB
#endif
#ifdef CONFIG_PAGE_SIZE_64KB
-#define PAGE_SHIFT 16
#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_64KB
#endif
#ifdef CONFIG_PAGE_SIZE_256KB
-#define PAGE_SHIFT 18
#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_256KB
#endif
#ifdef CONFIG_PAGE_SIZE_1MB
-#define PAGE_SHIFT 20
#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_1MB
#endif
@@ -50,6 +45,7 @@
#define HVM_HUGEPAGE_SIZE 0x5
#endif
+#define PAGE_SHIFT CONFIG_PAGE_SHIFT
#define PAGE_SIZE (1UL << PAGE_SHIFT)
#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
@@ -227,15 +227,6 @@ config MACH_LOONGSON64
config FIX_EARLYCON_MEM
def_bool y
-config PAGE_SIZE_4KB
- bool
-
-config PAGE_SIZE_16KB
- bool
-
-config PAGE_SIZE_64KB
- bool
-
config PGTABLE_2LEVEL
bool
@@ -288,7 +279,7 @@ choice
config 4KB_3LEVEL
bool "4KB with 3 levels"
- select PAGE_SIZE_4KB
+ select HAVE_PAGE_SIZE_4KB
select PGTABLE_3LEVEL
help
This option selects 4KB page size with 3 level page tables, which
@@ -296,7 +287,7 @@ config 4KB_3LEVEL
config 4KB_4LEVEL
bool "4KB with 4 levels"
- select PAGE_SIZE_4KB
+ select HAVE_PAGE_SIZE_4KB
select PGTABLE_4LEVEL
help
This option selects 4KB page size with 4 level page tables, which
@@ -304,7 +295,7 @@ config 4KB_4LEVEL
config 16KB_2LEVEL
bool "16KB with 2 levels"
- select PAGE_SIZE_16KB
+ select HAVE_PAGE_SIZE_16KB
select PGTABLE_2LEVEL
help
This option selects 16KB page size with 2 level page tables, which
@@ -312,7 +303,7 @@ config 16KB_2LEVEL
config 16KB_3LEVEL
bool "16KB with 3 levels"
- select PAGE_SIZE_16KB
+ select HAVE_PAGE_SIZE_16KB
select PGTABLE_3LEVEL
help
This option selects 16KB page size with 3 level page tables, which
@@ -320,7 +311,7 @@ config 16KB_3LEVEL
config 64KB_2LEVEL
bool "64KB with 2 levels"
- select PAGE_SIZE_64KB
+ select HAVE_PAGE_SIZE_64KB
select PGTABLE_2LEVEL
help
This option selects 64KB page size with 2 level page tables, which
@@ -328,7 +319,7 @@ config 64KB_2LEVEL
config 64KB_3LEVEL
bool "64KB with 3 levels"
- select PAGE_SIZE_64KB
+ select HAVE_PAGE_SIZE_64KB
select PGTABLE_3LEVEL
help
This option selects 64KB page size with 3 level page tables, which
@@ -11,15 +11,7 @@
/*
* PAGE_SHIFT determines the page size
*/
-#ifdef CONFIG_PAGE_SIZE_4KB
-#define PAGE_SHIFT 12
-#endif
-#ifdef CONFIG_PAGE_SIZE_16KB
-#define PAGE_SHIFT 14
-#endif
-#ifdef CONFIG_PAGE_SIZE_64KB
-#define PAGE_SHIFT 16
-#endif
+#define PAGE_SHIFT CONFIG_PAGE_SHIFT
#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE - 1))
@@ -81,6 +81,9 @@ config MIPS
select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
select HAVE_MOD_ARCH_SPECIFIC
select HAVE_NMI
+ select HAVE_PAGE_SIZE_4KB if !CPU_LOONGSON2EF && !CPU_LOONGSON64
+ select HAVE_PAGE_SIZE_16KB if !CPU_R3000
+ select HAVE_PAGE_SIZE_64KB if !CPU_R3000
select HAVE_PERF_EVENTS
select HAVE_PERF_REGS
select HAVE_PERF_USER_STACK_DUMP
@@ -1608,6 +1611,8 @@ config CPU_CAVIUM_OCTEON
depends on SYS_HAS_CPU_CAVIUM_OCTEON
select CPU_HAS_PREFETCH
select CPU_SUPPORTS_64BIT_KERNEL
+ select HAVE_PAGE_SIZE_8KB if !MIPS_VA_BITS_48
+ select HAVE_PAGE_SIZE_32KB if !MIPS_VA_BITS_48
select WEAK_ORDERING
select CPU_SUPPORTS_HIGHMEM
select CPU_SUPPORTS_HUGEPAGES
@@ -2029,59 +2034,6 @@ config ZBOOT_LOAD_ADDRESS
This is only used if non-zero.
-choice
- prompt "Kernel page size"
- default PAGE_SIZE_4KB
-
-config PAGE_SIZE_4KB
- bool "4kB"
- depends on !CPU_LOONGSON2EF && !CPU_LOONGSON64
- help
- This option select the standard 4kB Linux page size. On some
- R3000-family processors this is the only available page size. Using
- 4kB page size will minimize memory consumption and is therefore
- recommended for low memory systems.
-
-config PAGE_SIZE_8KB
- bool "8kB"
- depends on CPU_CAVIUM_OCTEON
- depends on !MIPS_VA_BITS_48
- help
- Using 8kB page size will result in higher performance kernel at
- the price of higher memory consumption. This option is available
- only on cnMIPS processors. Note that you will need a suitable Linux
- distribution to support this.
-
-config PAGE_SIZE_16KB
- bool "16kB"
- depends on !CPU_R3000
- help
- Using 16kB page size will result in higher performance kernel at
- the price of higher memory consumption. This option is available on
- all non-R3000 family processors. Note that you will need a suitable
- Linux distribution to support this.
-
-config PAGE_SIZE_32KB
- bool "32kB"
- depends on CPU_CAVIUM_OCTEON
- depends on !MIPS_VA_BITS_48
- help
- Using 32kB page size will result in higher performance kernel at
- the price of higher memory consumption. This option is available
- only on cnMIPS cores. Note that you will need a suitable Linux
- distribution to support this.
-
-config PAGE_SIZE_64KB
- bool "64kB"
- depends on !CPU_R3000
- help
- Using 64kB page size will result in higher performance kernel at
- the price of higher memory consumption. This option is available on
- all non-R3000 family processor. Not that at the time of this
- writing this option is still high experimental.
-
-endchoice
-
config ARCH_FORCE_MAX_ORDER
int "Maximum zone order"
default "13" if MIPS_HUGE_TLB_SUPPORT && PAGE_SIZE_64KB
@@ -17,21 +17,7 @@
/*
* PAGE_SHIFT determines the page size
*/
-#ifdef CONFIG_PAGE_SIZE_4KB
-#define PAGE_SHIFT 12
-#endif
-#ifdef CONFIG_PAGE_SIZE_8KB
-#define PAGE_SHIFT 13
-#endif
-#ifdef CONFIG_PAGE_SIZE_16KB
-#define PAGE_SHIFT 14
-#endif
-#ifdef CONFIG_PAGE_SIZE_32KB
-#define PAGE_SHIFT 15
-#endif
-#ifdef CONFIG_PAGE_SIZE_64KB
-#define PAGE_SHIFT 16
-#endif
+#define PAGE_SHIFT CONFIG_PAGE_SHIFT
#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
@@ -9,18 +9,7 @@
#include <linux/const.h>
/* PAGE_SHIFT determines the page size */
-#if defined(CONFIG_PAGE_SIZE_4KB)
-# define PAGE_SHIFT 12
-#elif defined(CONFIG_PAGE_SIZE_8KB)
-# define PAGE_SHIFT 13
-#elif defined(CONFIG_PAGE_SIZE_16KB)
-# define PAGE_SHIFT 14
-#elif defined(CONFIG_PAGE_SIZE_64KB)
-# define PAGE_SHIFT 16
-#else
-# error "Bogus kernel page size?"
-#endif
-
+#define PAGE_SHIFT CONFIG_PAGE_SHIFT
#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
#define PTE_MASK PAGE_MASK
@@ -4,6 +4,9 @@ menu "Memory management options"
config MMU
bool "Support for memory management hardware"
depends on !CPU_SH2
+ select HAVE_PAGE_SIZE_4KB
+ select HAVE_PAGE_SIZE_8KB if X2TLB
+ select HAVE_PAGE_SIZE_64KB if CPU_SH4
default y
help
Some SH processors (such as SH-2/SH-2A) lack an MMU. In order to
@@ -13,6 +16,15 @@ config MMU
turning this off will boot the kernel on these machines with the
MMU implicitly switched off.
+config NOMMU
+ def_bool !MMU
+ select HAVE_PAGE_SIZE_4KB
+ select HAVE_PAGE_SIZE_8KB
+ select HAVE_PAGE_SIZE_16KB
+ select HAVE_PAGE_SIZE_64KB
+ help
+ On MMU-less systems, any of these page sizes can be selected
+
config PAGE_OFFSET
hex
default "0x80000000" if MMU
@@ -147,36 +159,6 @@ config HAVE_SRAM_POOL
bool
select GENERIC_ALLOCATOR
-choice
- prompt "Kernel page size"
- default PAGE_SIZE_4KB
-
-config PAGE_SIZE_4KB
- bool "4kB"
- help
- This is the default page size used by all SuperH CPUs.
-
-config PAGE_SIZE_8KB
- bool "8kB"
- depends on !MMU || X2TLB
- help
- This enables 8kB pages as supported by SH-X2 and later MMUs.
-
-config PAGE_SIZE_16KB
- bool "16kB"
- depends on !MMU
- help
- This enables 16kB pages on MMU-less SH systems.
-
-config PAGE_SIZE_64KB
- bool "64kB"
- depends on !MMU || CPU_SH4
- help
- This enables support for 64kB pages, possible on all SH-4
- CPUs and later.
-
-endchoice
-
choice
prompt "HugeTLB page size"
depends on HUGETLB_PAGE