From: Toshi Kani <toshi.kani@hp.com>
To: akpm@linux-foundation.org, hpa@zytor.com, tglx@linutronix.de,
mingo@redhat.com, arnd@arndb.de
Cc: linux-mm@kvack.org, x86@kernel.org, linux-kernel@vger.kernel.org,
Elliott@hp.com, Toshi Kani <toshi.kani@hp.com>
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 [thread overview]
Message-ID: <1423521935-17454-8-git-send-email-toshi.kani@hp.com> (raw)
In-Reply-To: <1423521935-17454-1-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 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
#
next prev parent reply other threads:[~2015-02-09 22:46 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-09 22:45 [PATCH v2 0/7] Kernel huge I/O mapping support Toshi Kani
2015-02-09 22:45 ` [PATCH v2 1/7] mm: Change __get_vm_area_node() to use fls_long() Toshi Kani
2015-02-09 22:45 ` [PATCH v2 2/7] lib: Add huge I/O map capability interfaces Toshi Kani
2015-02-09 22:45 ` [PATCH v2 3/7] mm: Change ioremap to set up huge I/O mappings Toshi Kani
2015-02-09 22:45 ` [PATCH v2 4/7] mm: Change vunmap to tear down huge KVA mappings Toshi Kani
2015-02-09 22:45 ` [PATCH v2 5/7] x86, mm: Support huge KVA mappings on x86 Toshi Kani
2015-02-10 18:59 ` Dave Hansen
2015-02-10 20:42 ` Toshi Kani
2015-02-10 20:51 ` Dave Hansen
2015-02-10 22:13 ` Toshi Kani
2015-02-10 22:20 ` Toshi Kani
2015-02-10 23:10 ` Toshi Kani
2015-03-03 0:37 ` Toshi Kani
2015-02-09 22:45 ` [PATCH v2 6/7] x86, mm: Support huge I/O " Toshi Kani
2015-02-18 20:44 ` Ingo Molnar
2015-02-18 21:13 ` Toshi Kani
2015-02-18 21:15 ` Ingo Molnar
2015-02-18 21:33 ` Toshi Kani
2015-02-18 21:57 ` Ingo Molnar
2015-02-18 22:14 ` Toshi Kani
2015-02-09 22:45 ` Toshi Kani [this message]
2015-02-23 20:22 ` [PATCH v2 0/7] Kernel huge I/O mapping support Andrew Morton
2015-02-23 23:54 ` Toshi Kani
2015-02-24 8:09 ` Ingo Molnar
2015-03-02 15:51 ` Toshi Kani
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