[PATCH] Add MAP_HUGETLB for mmaping pseudo-anonymous huge page regions

From: Arnd Bergmann
Date: Fri Sep 18 2009 - 11:20:15 EST

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This patch adds a flag for mmap that will be used to request a huge
page region that will look like anonymous memory to user space. This
is accomplished by using a file on the internal vfsmount. MAP_HUGETLB
is a modifier of MAP_ANONYMOUS and so must be specified with it. The
region will behave the same as a MAP_ANONYMOUS region using small pages.

The patch also adds the MAP_STACK flag, which was previously defined
only on some architectures but not on others. Since MAP_STACK is meant
to be a hint only, architectures can define it without assigning a
specific meaning to it.

Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Eric B Munson <ebmunson@xxxxxxxxxx>
Cc: Hugh Dickins <hugh.dickins@xxxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx

---
On Friday 18 September 2009, Andrew Morton wrote:
> On Thu, 17 Sep 2009 15:44:04 -0700
> Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> > mm/mmap.c: In function 'do_mmap_pgoff':
> > mm/mmap.c:953: error: 'MAP_HUGETLB' undeclared (first use in this function)
>
> mips breaks as well.
>
> I don't know how many other architectures broke. I disabled the patches.

two: parisc and xtensa.

It's also done in a different way from the existing flags, which makes
it more likely to break again if someone tries to add another flag.

This patch is more along the lines of how I explained it could be done,
adding the MAP_HUGETLB (and MAP_STACK) flags to the existing lists in
a consistent way.

A logical next step would be to replace the mman.h files that are basically
copies of include/asm-generic/mman.h.

Arnd <><
---
arch/alpha/include/asm/mman.h | 2 ++
arch/arm/include/asm/mman.h | 2 ++
arch/avr32/include/asm/mman.h | 2 ++
arch/cris/include/asm/mman.h | 2 ++
arch/frv/include/asm/mman.h | 2 ++
arch/h8300/include/asm/mman.h | 2 ++
arch/ia64/include/asm/mman.h | 2 ++
arch/m32r/include/asm/mman.h | 2 ++
arch/m68k/include/asm/mman.h | 2 ++
arch/mips/include/asm/mman.h | 2 ++
arch/mn10300/include/asm/mman.h | 2 ++
arch/parisc/include/asm/mman.h | 2 ++
arch/powerpc/include/asm/mman.h | 2 ++
arch/s390/include/asm/mman.h | 2 ++
arch/sparc/include/asm/mman.h | 2 ++
arch/x86/include/asm/mman.h | 1 +
arch/xtensa/include/asm/mman.h | 2 ++
include/asm-generic/mman.h | 1 +
18 files changed, 34 insertions(+), 0 deletions(-)

diff --git a/arch/alpha/include/asm/mman.h b/arch/alpha/include/asm/mman.h
index 90d7c35..6e4d854 100644
--- a/arch/alpha/include/asm/mman.h
+++ b/arch/alpha/include/asm/mman.h
@@ -28,6 +28,8 @@
#define MAP_NORESERVE 0x10000 /* don't check for reservations */
#define MAP_POPULATE 0x20000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x40000 /* do not block on IO */
+#define MAP_STACK 0x80000 /* give out an address that is best suited for process/thread stacks */
+#define MAP_HUGETLB 0x100000 /* create a huge page mapping */

#define MS_ASYNC 1 /* sync memory asynchronously */
#define MS_SYNC 2 /* synchronous memory sync */
diff --git a/arch/arm/include/asm/mman.h b/arch/arm/include/asm/mman.h
index fc26976..6464d47 100644
--- a/arch/arm/include/asm/mman.h
+++ b/arch/arm/include/asm/mman.h
@@ -10,6 +10,8 @@
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
#define MAP_POPULATE 0x8000 /* populate (prefault) page tables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
+#define MAP_HUGETLB 0x40000 /* create a huge page mapping */

#define MCL_CURRENT 1 /* lock all current mappings */
#define MCL_FUTURE 2 /* lock all future mappings */
diff --git a/arch/avr32/include/asm/mman.h b/arch/avr32/include/asm/mman.h
index 9a92b15..38cea1b 100644
--- a/arch/avr32/include/asm/mman.h
+++ b/arch/avr32/include/asm/mman.h
@@ -10,6 +10,8 @@
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
#define MAP_POPULATE 0x8000 /* populate (prefault) page tables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
+#define MAP_HUGETLB 0x40000 /* create a huge page mapping */

#define MCL_CURRENT 1 /* lock all current mappings */
#define MCL_FUTURE 2 /* lock all future mappings */
diff --git a/arch/cris/include/asm/mman.h b/arch/cris/include/asm/mman.h
index b7f0afb..de6b903 100644
--- a/arch/cris/include/asm/mman.h
+++ b/arch/cris/include/asm/mman.h
@@ -12,6 +12,8 @@
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
+#define MAP_HUGETLB 0x40000 /* create a huge page mapping */

#define MCL_CURRENT 1 /* lock all current mappings */
#define MCL_FUTURE 2 /* lock all future mappings */
diff --git a/arch/frv/include/asm/mman.h b/arch/frv/include/asm/mman.h
index 58c1d11..1939343 100644
--- a/arch/frv/include/asm/mman.h
+++ b/arch/frv/include/asm/mman.h
@@ -10,6 +10,8 @@
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
+#define MAP_HUGETLB 0x40000 /* create a huge page mapping */

#define MCL_CURRENT 1 /* lock all current mappings */
#define MCL_FUTURE 2 /* lock all future mappings */
diff --git a/arch/h8300/include/asm/mman.h b/arch/h8300/include/asm/mman.h
index cf35f0a..eacacd0 100644
--- a/arch/h8300/include/asm/mman.h
+++ b/arch/h8300/include/asm/mman.h
@@ -10,6 +10,8 @@
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
+#define MAP_HUGETLB 0x40000 /* create a huge page mapping */

#define MCL_CURRENT 1 /* lock all current mappings */
#define MCL_FUTURE 2 /* lock all future mappings */
diff --git a/arch/ia64/include/asm/mman.h b/arch/ia64/include/asm/mman.h
index 48cf8b9..cf55884 100644
--- a/arch/ia64/include/asm/mman.h
+++ b/arch/ia64/include/asm/mman.h
@@ -18,6 +18,8 @@
#define MAP_NORESERVE 0x04000 /* don't check for reservations */
#define MAP_POPULATE 0x08000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
+#define MAP_HUGETLB 0x40000 /* create a huge page mapping */

#define MCL_CURRENT 1 /* lock all current mappings */
#define MCL_FUTURE 2 /* lock all future mappings */
diff --git a/arch/m32r/include/asm/mman.h b/arch/m32r/include/asm/mman.h
index 04a5f40..d191089 100644
--- a/arch/m32r/include/asm/mman.h
+++ b/arch/m32r/include/asm/mman.h
@@ -10,6 +10,8 @@
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
+#define MAP_HUGETLB 0x40000 /* create a huge page mapping */

#define MCL_CURRENT 1 /* lock all current mappings */
#define MCL_FUTURE 2 /* lock all future mappings */
diff --git a/arch/m68k/include/asm/mman.h b/arch/m68k/include/asm/mman.h
index 9f5c4c4..c421fef 100644
--- a/arch/m68k/include/asm/mman.h
+++ b/arch/m68k/include/asm/mman.h
@@ -10,6 +10,8 @@
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
+#define MAP_HUGETLB 0x40000 /* create a huge page mapping */

#define MCL_CURRENT 1 /* lock all current mappings */
#define MCL_FUTURE 2 /* lock all future mappings */
diff --git a/arch/mips/include/asm/mman.h b/arch/mips/include/asm/mman.h
index e4d6f1f..1578166 100644
--- a/arch/mips/include/asm/mman.h
+++ b/arch/mips/include/asm/mman.h
@@ -46,6 +46,8 @@
#define MAP_LOCKED 0x8000 /* pages are locked */
#define MAP_POPULATE 0x10000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x20000 /* do not block on IO */
+#define MAP_STACK 0x40000 /* give out an address that is best suited for process/thread stacks */
+#define MAP_HUGETLB 0x80000 /* create a huge page mapping */

/*
* Flags for msync
diff --git a/arch/mn10300/include/asm/mman.h b/arch/mn10300/include/asm/mman.h
index d04fac1..94611c3 100644
--- a/arch/mn10300/include/asm/mman.h
+++ b/arch/mn10300/include/asm/mman.h
@@ -21,6 +21,8 @@
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
+#define MAP_HUGETLB 0x40000 /* create a huge page mapping */

#define MCL_CURRENT 1 /* lock all current mappings */
#define MCL_FUTURE 2 /* lock all future mappings */
diff --git a/arch/parisc/include/asm/mman.h b/arch/parisc/include/asm/mman.h
index defe752..ce4b265 100644
--- a/arch/parisc/include/asm/mman.h
+++ b/arch/parisc/include/asm/mman.h
@@ -22,6 +22,8 @@
#define MAP_GROWSDOWN 0x8000 /* stack-like segment */
#define MAP_POPULATE 0x10000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x20000 /* do not block on IO */
+#define MAP_STACK 0x40000 /* give out an address that is best suited for process/thread stacks */
+#define MAP_HUGETLB 0x80000 /* create a huge page mapping */

#define MS_SYNC 1 /* synchronous memory sync */
#define MS_ASYNC 2 /* sync memory asynchronously */
diff --git a/arch/powerpc/include/asm/mman.h b/arch/powerpc/include/asm/mman.h
index 7b1c498..d4a7f64 100644
--- a/arch/powerpc/include/asm/mman.h
+++ b/arch/powerpc/include/asm/mman.h
@@ -25,6 +25,8 @@

#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
+#define MAP_HUGETLB 0x40000 /* create a huge page mapping */

#ifdef __KERNEL__
#ifdef CONFIG_PPC64
diff --git a/arch/s390/include/asm/mman.h b/arch/s390/include/asm/mman.h
index f63fe7b..22714ca 100644
--- a/arch/s390/include/asm/mman.h
+++ b/arch/s390/include/asm/mman.h
@@ -18,6 +18,8 @@
#define MAP_NORESERVE 0x4000 /* don't check for reservations */
#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
+#define MAP_HUGETLB 0x40000 /* create a huge page mapping */

#define MCL_CURRENT 1 /* lock all current mappings */
#define MCL_FUTURE 2 /* lock all future mappings */
diff --git a/arch/sparc/include/asm/mman.h b/arch/sparc/include/asm/mman.h
index 988192e..c3029ad 100644
--- a/arch/sparc/include/asm/mman.h
+++ b/arch/sparc/include/asm/mman.h
@@ -20,6 +20,8 @@

#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
+#define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
+#define MAP_HUGETLB 0x40000 /* create a huge page mapping */

#ifdef __KERNEL__
#ifndef __ASSEMBLY__
diff --git a/arch/x86/include/asm/mman.h b/arch/x86/include/asm/mman.h
index 751af25..c719f36 100644
--- a/arch/x86/include/asm/mman.h
+++ b/arch/x86/include/asm/mman.h
@@ -13,6 +13,7 @@
#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
#define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
+#define MAP_HUGETLB 0x40000 /* create a huge page mapping */

#define MCL_CURRENT 1 /* lock all current mappings */
#define MCL_FUTURE 2 /* lock all future mappings */
diff --git a/arch/xtensa/include/asm/mman.h b/arch/xtensa/include/asm/mman.h
index 9b92620..f380d04 100644
--- a/arch/xtensa/include/asm/mman.h
+++ b/arch/xtensa/include/asm/mman.h
@@ -53,6 +53,8 @@
#define MAP_LOCKED 0x8000 /* pages are locked */
#define MAP_POPULATE 0x10000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x20000 /* do not block on IO */
+#define MAP_STACK 0x40000 /* give out an address that is best suited for process/thread stacks */
+#define MAP_HUGETLB 0x80000 /* create a huge page mapping */

/*
* Flags for msync
diff --git a/include/asm-generic/mman.h b/include/asm-generic/mman.h
index 7cab4de..32c8bd6 100644
--- a/include/asm-generic/mman.h
+++ b/include/asm-generic/mman.h
@@ -11,6 +11,7 @@
#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
#define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
+#define MAP_HUGETLB 0x40000 /* create a huge page mapping */

#define MCL_CURRENT 1 /* lock all current mappings */
#define MCL_FUTURE 2 /* lock all future mappings */
--
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Next message: Jun'ichi Nomura: "[PATCH 1/3] block: Add a tracepoint for block request remapping"
Previous message: Mike Frysinger: "Re: [PATCH v5][bfin-sport-uart] fit blackfin uart over sport driver into common uart inftrastructure"
In reply to: Andrew Morton: "Re: [PATCH 2/3] Add MAP_HUGETLB for mmaping pseudo-anonymous hugepage regions"
Next in thread: Arnd Bergmann: "[PATCH] remove duplicate asm/mman.h files"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]