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authorSteven J. Magnani <steve@digidescorp.com>2010-05-13 10:48:27 -0500
committerMichal Simek <monstr@monstr.eu>2010-08-04 10:22:34 +0200
commitba9c4f88d747836bf35c3eee36aa18d2e164f493 (patch)
treed244c9946b40af1ea21a1b71d3e49efa513bb4b7 /arch/microblaze/Kconfig
parent0d9ec762af297f1ef38114f9498322d994063802 (diff)
downloadvexpress-lsk-ba9c4f88d747836bf35c3eee36aa18d2e164f493.tar.gz
microblaze: Allow PAGE_SIZE configuration
Allow developer to configure memory page size at compile time. Larger pages can improve performance on some workloads. Based on PowerPC code. Signed-off-by: Steven J. Magnani <steve@digidescorp.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/Kconfig')
-rw-r--r--arch/microblaze/Kconfig30
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 505a0859242..a51742190c1 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -223,6 +223,36 @@ config TASK_SIZE
hex "Size of user task space" if TASK_SIZE_BOOL
default "0x80000000"
+choice
+ prompt "Page size"
+ default MICROBLAZE_4K_PAGES
+ depends on ADVANCED_OPTIONS && !MMU
+ help
+ Select the kernel logical page size. Increasing the page size
+ will reduce software overhead at each page boundary, allow
+ hardware prefetch mechanisms to be more effective, and allow
+ larger dma transfers increasing IO efficiency and reducing
+ overhead. However the utilization of memory will increase.
+ For example, each cached file will using a multiple of the
+ page size to hold its contents and the difference between the
+ end of file and the end of page is wasted.
+
+ If unsure, choose 4K_PAGES.
+
+config MICROBLAZE_4K_PAGES
+ bool "4k page size"
+
+config MICROBLAZE_8K_PAGES
+ bool "8k page size"
+
+config MICROBLAZE_16K_PAGES
+ bool "16k page size"
+
+config MICROBLAZE_32K_PAGES
+ bool "32k page size"
+
+endchoice
+
endmenu
source "mm/Kconfig"