From: Charlie Jenkins <charlie@rivosinc.com>
To: Arnd Bergmann <arnd@arndb.de>,
Richard Henderson <richard.henderson@linaro.org>,
Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
Matt Turner <mattst88@gmail.com>,
Vineet Gupta <vgupta@kernel.org>,
Russell King <linux@armlinux.org.uk>,
Guo Ren <guoren@kernel.org>, Huacai Chen <chenhuacai@kernel.org>,
WANG Xuerui <kernel@xen0n.name>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
Helge Deller <deller@gmx.de>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
Naveen N Rao <naveen@kernel.org>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
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Christian Borntraeger <borntraeger@linux.ibm.com>,
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Yoshinori Sato <ysato@users.sourceforge.jp>,
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John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
"David S. Miller" <davem@davemloft.net>,
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"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Vlastimil Babka <vbabka@suse.cz>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
Shuah Khan <shuah@kernel.org>
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linux-csky@vger.kernel.org, loongarch@lists.linux.dev,
linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
linux-sh@vger.kernel.org, sparclinux@vger.kernel.org,
linux-mm@kvack.org, linux-kselftest@vger.kernel.org,
Charlie Jenkins <charlie@rivosinc.com>
Subject: [PATCH RFC v2 1/4] mm: Add MAP_BELOW_HINT
Date: Thu, 29 Aug 2024 00:15:58 -0700 [thread overview]
Message-ID: <20240829-patches-below_hint_mmap-v2-1-638a28d9eae0@rivosinc.com> (raw)
In-Reply-To: <20240829-patches-below_hint_mmap-v2-0-638a28d9eae0@rivosinc.com>
Some applications rely on placing data in free bits addresses allocated
by mmap. Various architectures (eg. x86, arm64, powerpc) restrict the
address returned by mmap to be less than the 48-bit address space,
unless the hint address uses more than 47 bits (the 48th bit is reserved
for the kernel address space).
To make this behavior explicit and more versatile across all
architectures, define a mmap flag that allows users to define an
arbitrary upper limit on addresses returned by mmap.
Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
---
include/uapi/asm-generic/mman-common.h | 1 +
tools/include/uapi/asm-generic/mman-common.h | 1 +
2 files changed, 2 insertions(+)
diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h
index 6ce1f1ceb432..03ac13d9aa37 100644
--- a/include/uapi/asm-generic/mman-common.h
+++ b/include/uapi/asm-generic/mman-common.h
@@ -32,6 +32,7 @@
#define MAP_UNINITIALIZED 0x4000000 /* For anonymous mmap, memory could be
* uninitialized */
+#define MAP_BELOW_HINT 0x8000000 /* give out address that is below (inclusive) hint address */
/*
* Flags for mlock
diff --git a/tools/include/uapi/asm-generic/mman-common.h b/tools/include/uapi/asm-generic/mman-common.h
index 6ce1f1ceb432..03ac13d9aa37 100644
--- a/tools/include/uapi/asm-generic/mman-common.h
+++ b/tools/include/uapi/asm-generic/mman-common.h
@@ -32,6 +32,7 @@
#define MAP_UNINITIALIZED 0x4000000 /* For anonymous mmap, memory could be
* uninitialized */
+#define MAP_BELOW_HINT 0x8000000 /* give out address that is below (inclusive) hint address */
/*
* Flags for mlock
--
2.45.0
next prev parent reply other threads:[~2024-08-29 7:16 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-29 7:15 [PATCH RFC v2 0/4] mm: Introduce MAP_BELOW_HINT Charlie Jenkins
2024-08-29 7:15 ` Charlie Jenkins [this message]
2024-08-29 8:26 ` [PATCH RFC v2 1/4] mm: Add MAP_BELOW_HINT Michael Ellerman
2024-08-30 1:16 ` Charlie Jenkins
2024-08-29 7:15 ` [PATCH RFC v2 2/4] mm: Add hint and mmap_flags to struct vm_unmapped_area_info Charlie Jenkins
2024-08-29 8:48 ` Lorenzo Stoakes
2024-08-30 1:11 ` Charlie Jenkins
2024-09-03 17:18 ` Christophe Leroy
2024-08-29 7:16 ` [PATCH RFC v2 3/4] mm: Support MAP_BELOW_HINT in vm_unmapped_area() Charlie Jenkins
2024-08-29 7:16 ` [PATCH RFC v2 4/4] selftests/mm: Create MAP_BELOW_HINT test Charlie Jenkins
2024-08-29 8:30 ` [PATCH RFC v2 0/4] mm: Introduce MAP_BELOW_HINT Michal Hocko
2024-08-29 17:33 ` Charlie Jenkins
2024-09-03 8:44 ` Michal Hocko
2024-08-29 8:42 ` Lorenzo Stoakes
2024-08-29 9:54 ` Lorenzo Stoakes
2024-08-29 22:16 ` Charlie Jenkins
2024-08-30 9:52 ` Lorenzo Stoakes
2024-08-31 1:45 ` Charlie Jenkins
2024-08-30 15:03 ` Dave Hansen
2024-08-30 15:18 ` Lorenzo Stoakes
2024-08-29 9:02 ` Vlastimil Babka
2024-08-29 17:00 ` Palmer Dabbelt
2024-09-05 6:47 ` Kirill A. Shutemov
2024-09-05 17:26 ` Charlie Jenkins
2024-09-09 9:46 ` Kirill A. Shutemov
2024-10-21 13:22 ` Steven Price
2024-10-21 19:48 ` Liam R. Howlett
2024-10-23 9:31 ` Steven Price
2024-10-23 18:10 ` Liam R. Howlett
2024-10-24 10:52 ` Steven Price
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