From: Charlie Jenkins <charlie@rivosinc.com>
To: Arnd Bergmann <arnd@arndb.de>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
Naveen N Rao <naveen@kernel.org>,
Muchun Song <muchun.song@linux.dev>,
Andrew Morton <akpm@linux-foundation.org>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Vlastimil Babka <vbabka@suse.cz>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Huacai Chen <chenhuacai@kernel.org>,
WANG Xuerui <kernel@xen0n.name>,
Russell King <linux@armlinux.org.uk>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
Helge Deller <deller@gmx.de>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
Rich Felker <dalias@libc.org>,
John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
"David S. Miller" <davem@davemloft.net>,
Andreas Larsson <andreas@gaisler.com>,
Shuah Khan <shuah@kernel.org>,
Alexandre Ghiti <alexghiti@rivosinc.com>
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
Palmer Dabbelt <palmer@rivosinc.com>,
linux-riscv@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org,
loongarch@lists.linux.dev, linux-mips@vger.kernel.org,
linux-parisc@vger.kernel.org, linux-s390@vger.kernel.org,
linux-sh@vger.kernel.org, sparclinux@vger.kernel.org,
linux-kselftest@vger.kernel.org,
Charlie Jenkins <charlie@rivosinc.com>
Subject: [PATCH 01/16] mm: Add MAP_BELOW_HINT
Date: Tue, 27 Aug 2024 22:49:07 -0700 [thread overview]
Message-ID: <20240827-patches-below_hint_mmap-v1-1-46ff2eb9022d@rivosinc.com> (raw)
In-Reply-To: <20240827-patches-below_hint_mmap-v1-0-46ff2eb9022d@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 maximum address space,
unless the hint address is greater than this value.
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:[~2024-08-28 5:49 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-28 5:49 [PATCH 00/16] mm: Introduce MAP_BELOW_HINT Charlie Jenkins
2024-08-28 5:49 ` Charlie Jenkins [this message]
2024-08-28 5:49 ` [PATCH 02/16] riscv: mm: Do not restrict mmap address based on hint Charlie Jenkins
2024-08-28 5:49 ` [PATCH 03/16] mm: Add flag and len param to arch_get_mmap_base() Charlie Jenkins
2024-08-28 5:49 ` [PATCH 04/16] mm: Add generic MAP_BELOW_HINT Charlie Jenkins
2024-08-28 5:49 ` [PATCH 05/16] riscv: mm: Support MAP_BELOW_HINT Charlie Jenkins
2024-08-28 5:49 ` [PATCH 06/16] arm64: " Charlie Jenkins
2024-08-28 5:49 ` [PATCH 07/16] powerpc: " Charlie Jenkins
2024-08-28 6:34 ` Christophe Leroy
2024-08-28 17:29 ` Charlie Jenkins
2024-08-31 16:30 ` David Laight
2024-08-28 5:49 ` [PATCH 08/16] x86: " Charlie Jenkins
2024-08-28 5:49 ` [PATCH 09/16] loongarch: " Charlie Jenkins
2024-08-28 5:49 ` [PATCH 10/16] arm: " Charlie Jenkins
2024-08-28 5:49 ` [PATCH 11/16] mips: " Charlie Jenkins
2024-08-28 5:49 ` [PATCH 12/16] parisc: " Charlie Jenkins
2024-08-28 5:49 ` [PATCH 13/16] s390: " Charlie Jenkins
2024-08-28 5:49 ` [PATCH 14/16] sh: " Charlie Jenkins
2024-08-28 5:49 ` [PATCH 15/16] sparc: " Charlie Jenkins
2024-08-28 5:49 ` [PATCH 16/16] selftests/mm: Create MAP_BELOW_HINT test Charlie Jenkins
2024-08-28 17:48 ` Lorenzo Stoakes
2024-08-28 18:13 ` Charlie Jenkins
2024-08-28 18:19 ` [PATCH 00/16] mm: Introduce MAP_BELOW_HINT Lorenzo Stoakes
2024-08-29 7:14 ` Charlie Jenkins
2024-08-28 18:29 ` Dave Hansen
2024-08-28 20:15 ` Charlie Jenkins
2024-08-29 16:54 ` Dave Hansen
2024-08-29 19:36 ` Liam R. Howlett
2024-08-30 1:10 ` Charlie Jenkins
2024-08-30 1:00 ` Charlie Jenkins
2024-08-28 18:31 ` Liam R. Howlett
2024-08-28 20:59 ` Charlie Jenkins
2024-08-28 21:39 ` Charlie Jenkins
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