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Message-Id: <1422314009-31667-8-git-send-email-toshi.kani@hp.com> Date: Mon, 26 Jan 2015 16:13:29 -0700 From: Toshi Kani <toshi.kani@...com> To: akpm@...ux-foundation.org, hpa@...or.com, tglx@...utronix.de, mingo@...hat.com, arnd@...db.de, linux-mm@...ck.org Cc: x86@...nel.org, linux-kernel@...r.kernel.org, Toshi Kani <toshi.kani@...com> Subject: [RFC PATCH 7/7] mm: Add config HUGE_IOMAP to enable huge I/O mappings 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, user can also disable this feature at boot-time by the kernel option "nohgiomap" if necessary. Signed-off-by: Toshi Kani <toshi.kani@...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 # -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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