From: Toshi Kani <toshi.kani@hp.com> To: akpm@linux-foundation.org, hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, arnd@arndb.de, linux-mm@kvack.org Cc: x86@kernel.org, linux-kernel@vger.kernel.org, Toshi Kani <toshi.kani@hp.com> Subject: [RFC PATCH 7/7] mm: Add config HUGE_IOMAP to enable huge I/O mappings Date: Mon, 26 Jan 2015 16:13:29 -0700 [thread overview] Message-ID: <1422314009-31667-8-git-send-email-toshi.kani@hp.com> (raw) In-Reply-To: <1422314009-31667-1-git-send-email-toshi.kani@hp.com> 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@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 #
WARNING: multiple messages have this Message-ID (diff)
From: Toshi Kani <toshi.kani@hp.com> To: akpm@linux-foundation.org, hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, arnd@arndb.de, linux-mm@kvack.org Cc: x86@kernel.org, linux-kernel@vger.kernel.org, Toshi Kani <toshi.kani@hp.com> Subject: [RFC PATCH 7/7] mm: Add config HUGE_IOMAP to enable huge I/O mappings Date: Mon, 26 Jan 2015 16:13:29 -0700 [thread overview] Message-ID: <1422314009-31667-8-git-send-email-toshi.kani@hp.com> (raw) In-Reply-To: <1422314009-31667-1-git-send-email-toshi.kani@hp.com> 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@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 # -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2015-01-26 23:30 UTC|newest] Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-01-26 23:13 [RFC PATCH 0/7] Kernel huge I/O mapping support Toshi Kani 2015-01-26 23:13 ` Toshi Kani 2015-01-26 23:13 ` [RFC PATCH 1/7] mm: Change __get_vm_area_node() to use fls_long() Toshi Kani 2015-01-26 23:13 ` Toshi Kani 2015-01-26 23:13 ` [RFC PATCH 2/7] lib: Add huge I/O map capability interfaces Toshi Kani 2015-01-26 23:13 ` Toshi Kani 2015-01-26 23:54 ` Andrew Morton 2015-01-26 23:54 ` Andrew Morton 2015-01-27 1:01 ` Toshi Kani 2015-01-27 1:01 ` Toshi Kani 2015-01-27 21:37 ` Andrew Morton 2015-01-27 21:37 ` Andrew Morton 2015-01-27 22:01 ` Toshi Kani 2015-01-27 22:01 ` Toshi Kani 2015-02-05 20:56 ` Toshi Kani 2015-02-05 20:56 ` Toshi Kani 2015-01-26 23:13 ` [RFC PATCH 3/7] mm: Change ioremap to set up huge I/O mappings Toshi Kani 2015-01-26 23:13 ` Toshi Kani 2015-01-26 23:58 ` Andrew Morton 2015-01-26 23:58 ` Andrew Morton 2015-01-27 0:01 ` Toshi Kani 2015-01-27 0:01 ` Toshi Kani 2015-01-26 23:13 ` [RFC PATCH 4/7] mm: Change vunmap to tear down huge KVA mappings Toshi Kani 2015-01-26 23:13 ` Toshi Kani 2015-01-26 23:13 ` [RFC PATCH 5/7] x86, mm: Support huge KVA mappings on x86 Toshi Kani 2015-01-26 23:13 ` Toshi Kani 2015-01-26 23:13 ` [RFC PATCH 6/7] x86, mm: Support huge I/O " Toshi Kani 2015-01-26 23:13 ` Toshi Kani 2015-01-26 23:13 ` Toshi Kani [this message] 2015-01-26 23:13 ` [RFC PATCH 7/7] mm: Add config HUGE_IOMAP to enable huge I/O mappings Toshi Kani
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