Messages in this thread Patch in this message | | | From | Toshi Kani <> | Subject | [PATCH v2 7/7] mm: Add config HUGE_IOMAP to enable huge I/O mappings | Date | Mon, 9 Feb 2015 15:45:35 -0700 |
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Add config HUGE_IOMAP to enable huge I/O mappings. This feature is set to Y by default when HAVE_ARCH_HUGE_VMAP is defined on the architecture.
Note that user can also disable this feature at boot-time by the new kernel option "nohugeiomap" when necessary.
Signed-off-by: Toshi Kani <toshi.kani@hp.com> --- mm/Kconfig | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/mm/Kconfig b/mm/Kconfig index 1d1ae6b..eb738ae 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -444,6 +444,17 @@ choice benefit. endchoice +config HUGE_IOMAP + bool "Kernel huge I/O mapping support" + depends on HAVE_ARCH_HUGE_VMAP + default y + help + Kernel huge I/O mapping allows the kernel to transparently + create I/O mappings with huge pages for memory-mapped I/O + devices whenever possible. This feature can improve + performance of certain devices with large memory size, such + as NVM, and reduce the time to create their mappings. + # # UP and nommu archs use km based percpu allocator #
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