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[173.79.56.208]) by smtp.gmail.com with ESMTPSA id 11-20020a170902c20b00b001ce664c05b0sm19456335pll.33.2023.12.18.11.47.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Dec 2023 11:47:16 -0800 (PST) From: Gregory Price X-Google-Original-From: Gregory Price To: linux-mm@kvack.org Cc: linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, x86@kernel.org, akpm@linux-foundation.org, arnd@arndb.de, tglx@linutronix.de, luto@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, mhocko@kernel.org, tj@kernel.org, ying.huang@intel.com, gregory.price@memverge.com, corbet@lwn.net, rakie.kim@sk.com, hyeongtak.ji@sk.com, honggyu.kim@sk.com, vtavarespetr@micron.com, peterz@infradead.org, jgroves@micron.com, ravis.opensrc@micron.com, sthanneeru@micron.com, emirakhur@micron.com, Hasan.Maruf@amd.com, seungjun.ha@samsung.com, Michal Hocko Subject: [PATCH v4 08/11] mm/mempolicy: add set_mempolicy2 syscall Date: Mon, 18 Dec 2023 14:46:28 -0500 Message-Id: <20231218194631.21667-9-gregory.price@memverge.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20231218194631.21667-1-gregory.price@memverge.com> References: <20231218194631.21667-1-gregory.price@memverge.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 set_mempolicy2 is an extensible set_mempolicy interface which allows a user to set the per-task memory policy. Defined as: set_mempolicy2(struct mpol_args *args, size_t size, unsigned long flags); relevant mpol_args fields include the following: mode: The MPOL_* policy (DEFAULT, INTERLEAVE, etc.) mode_flags: The MPOL_F_* flags that were previously passed in or'd into the mode. This was split to hopefully allow future extensions additional mode/flag space. pol_nodes: the nodemask to apply for the memory policy pol_maxnodes: The max number of nodes described by pol_nodes The usize arg is intended for the user to pass in sizeof(mpol_args) to allow forward/backward compatibility whenever possible. The flags argument is intended to future proof the syscall against future extensions which may require interpreting the arguments in the structure differently. Semantics of `set_mempolicy` are otherwise the same as `set_mempolicy` as of this patch. Suggested-by: Michal Hocko Signed-off-by: Gregory Price --- .../admin-guide/mm/numa_memory_policy.rst | 10 ++++++ arch/alpha/kernel/syscalls/syscall.tbl | 1 + arch/arm/tools/syscall.tbl | 1 + arch/arm64/include/asm/unistd.h | 2 +- arch/arm64/include/asm/unistd32.h | 2 ++ arch/m68k/kernel/syscalls/syscall.tbl | 1 + arch/microblaze/kernel/syscalls/syscall.tbl | 1 + arch/mips/kernel/syscalls/syscall_n32.tbl | 1 + arch/mips/kernel/syscalls/syscall_o32.tbl | 1 + arch/parisc/kernel/syscalls/syscall.tbl | 1 + arch/powerpc/kernel/syscalls/syscall.tbl | 1 + arch/s390/kernel/syscalls/syscall.tbl | 1 + arch/sh/kernel/syscalls/syscall.tbl | 1 + arch/sparc/kernel/syscalls/syscall.tbl | 1 + arch/x86/entry/syscalls/syscall_32.tbl | 1 + arch/x86/entry/syscalls/syscall_64.tbl | 1 + arch/xtensa/kernel/syscalls/syscall.tbl | 1 + include/linux/syscalls.h | 2 ++ include/uapi/asm-generic/unistd.h | 4 ++- kernel/sys_ni.c | 1 + mm/mempolicy.c | 36 +++++++++++++++++++ .../arch/mips/entry/syscalls/syscall_n64.tbl | 1 + .../arch/powerpc/entry/syscalls/syscall.tbl | 1 + .../perf/arch/s390/entry/syscalls/syscall.tbl | 1 + .../arch/x86/entry/syscalls/syscall_64.tbl | 1 + 25 files changed, 73 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/mm/numa_memory_policy.rst b/Documentation/admin-guide/mm/numa_memory_policy.rst index d5fcebdd7996..e57d400d0281 100644 --- a/Documentation/admin-guide/mm/numa_memory_policy.rst +++ b/Documentation/admin-guide/mm/numa_memory_policy.rst @@ -432,6 +432,8 @@ Set [Task] Memory Policy:: long set_mempolicy(int mode, const unsigned long *nmask, unsigned long maxnode); + long set_mempolicy2(struct mpol_args args, size_t size, + unsigned long flags); Set's the calling task's "task/process memory policy" to mode specified by the 'mode' argument and the set of nodes defined by @@ -440,6 +442,12 @@ specified by the 'mode' argument and the set of nodes defined by 'mode' argument with the flag (for example: MPOL_INTERLEAVE | MPOL_F_STATIC_NODES). +set_mempolicy2() is an extended version of set_mempolicy() capable +of setting a mempolicy which requires more information than can be +passed via get_mempolicy(). For example, weighted interleave with +task-local weights requires a weight array to be passed via the +'mpol_args->il_weights' argument in the 'struct mpol_args' arg. + See the set_mempolicy(2) man page for more details @@ -496,6 +504,8 @@ Extended Mempolicy Arguments:: The extended mempolicy argument structure is defined to allow the mempolicy interfaces future extensibility without the need for additional system calls. +Extended interfaces (set_mempolicy2) use this argument structure. + The core arguments (mode, mode_flags, pol_nodes, and pol_maxnodes) apply to all interfaces relative to their non-extended counterparts. Each additional field may only apply to specific extended interfaces. See the respective diff --git a/arch/alpha/kernel/syscalls/syscall.tbl b/arch/alpha/kernel/syscalls/syscall.tbl index 18c842ca6c32..0dc288a1118a 100644 --- a/arch/alpha/kernel/syscalls/syscall.tbl +++ b/arch/alpha/kernel/syscalls/syscall.tbl @@ -496,3 +496,4 @@ 564 common futex_wake sys_futex_wake 565 common futex_wait sys_futex_wait 566 common futex_requeue sys_futex_requeue +567 common set_mempolicy2 sys_set_mempolicy2 diff --git a/arch/arm/tools/syscall.tbl b/arch/arm/tools/syscall.tbl index 584f9528c996..50172ec0e1f5 100644 --- a/arch/arm/tools/syscall.tbl +++ b/arch/arm/tools/syscall.tbl @@ -470,3 +470,4 @@ 454 common futex_wake sys_futex_wake 455 common futex_wait sys_futex_wait 456 common futex_requeue sys_futex_requeue +457 common set_mempolicy2 sys_set_mempolicy2 diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h index 531effca5f1f..298313d2e0af 100644 --- a/arch/arm64/include/asm/unistd.h +++ b/arch/arm64/include/asm/unistd.h @@ -39,7 +39,7 @@ #define __ARM_NR_compat_set_tls (__ARM_NR_COMPAT_BASE + 5) #define __ARM_NR_COMPAT_END (__ARM_NR_COMPAT_BASE + 0x800) -#define __NR_compat_syscalls 457 +#define __NR_compat_syscalls 458 #endif #define __ARCH_WANT_SYS_CLONE diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h index 9f7c1bf99526..cee8d669c342 100644 --- a/arch/arm64/include/asm/unistd32.h +++ b/arch/arm64/include/asm/unistd32.h @@ -919,6 +919,8 @@ __SYSCALL(__NR_futex_wake, sys_futex_wake) __SYSCALL(__NR_futex_wait, sys_futex_wait) #define __NR_futex_requeue 456 __SYSCALL(__NR_futex_requeue, sys_futex_requeue) +#define __NR_set_mempolicy2 457 +__SYSCALL(__NR_set_mempolicy2, sys_set_mempolicy2) /* * Please add new compat syscalls above this comment and update diff --git a/arch/m68k/kernel/syscalls/syscall.tbl b/arch/m68k/kernel/syscalls/syscall.tbl index 7a4b780e82cb..839d90c535f2 100644 --- a/arch/m68k/kernel/syscalls/syscall.tbl +++ b/arch/m68k/kernel/syscalls/syscall.tbl @@ -456,3 +456,4 @@ 454 common futex_wake sys_futex_wake 455 common futex_wait sys_futex_wait 456 common futex_requeue sys_futex_requeue +457 common set_mempolicy2 sys_set_mempolicy2 diff --git a/arch/microblaze/kernel/syscalls/syscall.tbl b/arch/microblaze/kernel/syscalls/syscall.tbl index 5b6a0b02b7de..567c8b883735 100644 --- a/arch/microblaze/kernel/syscalls/syscall.tbl +++ b/arch/microblaze/kernel/syscalls/syscall.tbl @@ -462,3 +462,4 @@ 454 common futex_wake sys_futex_wake 455 common futex_wait sys_futex_wait 456 common futex_requeue sys_futex_requeue +457 common set_mempolicy2 sys_set_mempolicy2 diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl index a842b41c8e06..cc0640e16f2f 100644 --- a/arch/mips/kernel/syscalls/syscall_n32.tbl +++ b/arch/mips/kernel/syscalls/syscall_n32.tbl @@ -395,3 +395,4 @@ 454 n32 futex_wake sys_futex_wake 455 n32 futex_wait sys_futex_wait 456 n32 futex_requeue sys_futex_requeue +457 n32 set_mempolicy2 sys_set_mempolicy2 diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl index 525cc54bc63b..f7262fde98d9 100644 --- a/arch/mips/kernel/syscalls/syscall_o32.tbl +++ b/arch/mips/kernel/syscalls/syscall_o32.tbl @@ -444,3 +444,4 @@ 454 o32 futex_wake sys_futex_wake 455 o32 futex_wait sys_futex_wait 456 o32 futex_requeue sys_futex_requeue +457 o32 set_mempolicy2 sys_set_mempolicy2 diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl index a47798fed54e..e10f0e8bd064 100644 --- a/arch/parisc/kernel/syscalls/syscall.tbl +++ b/arch/parisc/kernel/syscalls/syscall.tbl @@ -455,3 +455,4 @@ 454 common futex_wake sys_futex_wake 455 common futex_wait sys_futex_wait 456 common futex_requeue sys_futex_requeue +457 common set_mempolicy2 sys_set_mempolicy2 diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl index 7fab411378f2..4f03f5f42b78 100644 --- a/arch/powerpc/kernel/syscalls/syscall.tbl +++ b/arch/powerpc/kernel/syscalls/syscall.tbl @@ -543,3 +543,4 @@ 454 common futex_wake sys_futex_wake 455 common futex_wait sys_futex_wait 456 common futex_requeue sys_futex_requeue +457 common set_mempolicy2 sys_set_mempolicy2 diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl index 86fec9b080f6..f98dadc2e9df 100644 --- a/arch/s390/kernel/syscalls/syscall.tbl +++ b/arch/s390/kernel/syscalls/syscall.tbl @@ -459,3 +459,4 @@ 454 common futex_wake sys_futex_wake sys_futex_wake 455 common futex_wait sys_futex_wait sys_futex_wait 456 common futex_requeue sys_futex_requeue sys_futex_requeue +457 common set_mempolicy2 sys_set_mempolicy2 sys_set_mempolicy2 diff --git a/arch/sh/kernel/syscalls/syscall.tbl b/arch/sh/kernel/syscalls/syscall.tbl index 363fae0fe9bf..f47ba9f2d05d 100644 --- a/arch/sh/kernel/syscalls/syscall.tbl +++ b/arch/sh/kernel/syscalls/syscall.tbl @@ -459,3 +459,4 @@ 454 common futex_wake sys_futex_wake 455 common futex_wait sys_futex_wait 456 common futex_requeue sys_futex_requeue +457 common set_mempolicy2 sys_set_mempolicy2 diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl index 7bcaa3d5ea44..53fb16616728 100644 --- a/arch/sparc/kernel/syscalls/syscall.tbl +++ b/arch/sparc/kernel/syscalls/syscall.tbl @@ -502,3 +502,4 @@ 454 common futex_wake sys_futex_wake 455 common futex_wait sys_futex_wait 456 common futex_requeue sys_futex_requeue +457 common set_mempolicy2 sys_set_mempolicy2 diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl index c8fac5205803..4b4dc41b24ee 100644 --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -461,3 +461,4 @@ 454 i386 futex_wake sys_futex_wake 455 i386 futex_wait sys_futex_wait 456 i386 futex_requeue sys_futex_requeue +457 i386 set_mempolicy2 sys_set_mempolicy2 diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl index 8cb8bf68721c..1bc2190bec27 100644 --- a/arch/x86/entry/syscalls/syscall_64.tbl +++ b/arch/x86/entry/syscalls/syscall_64.tbl @@ -378,6 +378,7 @@ 454 common futex_wake sys_futex_wake 455 common futex_wait sys_futex_wait 456 common futex_requeue sys_futex_requeue +457 common set_mempolicy2 sys_set_mempolicy2 # # Due to a historical design error, certain syscalls are numbered differently diff --git a/arch/xtensa/kernel/syscalls/syscall.tbl b/arch/xtensa/kernel/syscalls/syscall.tbl index 06eefa9c1458..e26dc89399eb 100644 --- a/arch/xtensa/kernel/syscalls/syscall.tbl +++ b/arch/xtensa/kernel/syscalls/syscall.tbl @@ -427,3 +427,4 @@ 454 common futex_wake sys_futex_wake 455 common futex_wait sys_futex_wait 456 common futex_requeue sys_futex_requeue +457 common set_mempolicy2 sys_set_mempolicy2 diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index a52395ca3f00..451f0089601f 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -823,6 +823,8 @@ asmlinkage long sys_get_mempolicy(int __user *policy, unsigned long addr, unsigned long flags); asmlinkage long sys_set_mempolicy(int mode, const unsigned long __user *nmask, unsigned long maxnode); +asmlinkage long sys_set_mempolicy2(struct mpol_args __user *args, size_t size, + unsigned long flags); asmlinkage long sys_migrate_pages(pid_t pid, unsigned long maxnode, const unsigned long __user *from, const unsigned long __user *to); diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h index 756b013fb832..55486aba099f 100644 --- a/include/uapi/asm-generic/unistd.h +++ b/include/uapi/asm-generic/unistd.h @@ -828,9 +828,11 @@ __SYSCALL(__NR_futex_wake, sys_futex_wake) __SYSCALL(__NR_futex_wait, sys_futex_wait) #define __NR_futex_requeue 456 __SYSCALL(__NR_futex_requeue, sys_futex_requeue) +#define __NR_set_mempolicy2 457 +__SYSCALL(__NR_set_mempolicy2, sys_set_mempolicy2) #undef __NR_syscalls -#define __NR_syscalls 457 +#define __NR_syscalls 458 /* * 32 bit systems traditionally used different diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c index e1a6e3c675c0..7d6eb0eec056 100644 --- a/kernel/sys_ni.c +++ b/kernel/sys_ni.c @@ -189,6 +189,7 @@ COND_SYSCALL(remap_file_pages); COND_SYSCALL(mbind); COND_SYSCALL(get_mempolicy); COND_SYSCALL(set_mempolicy); +COND_SYSCALL(set_mempolicy2); COND_SYSCALL(migrate_pages); COND_SYSCALL(move_pages); COND_SYSCALL(set_mempolicy_home_node); diff --git a/mm/mempolicy.c b/mm/mempolicy.c index fe340480e296..eb296ed507e6 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1636,6 +1636,42 @@ SYSCALL_DEFINE3(set_mempolicy, int, mode, const unsigned long __user *, nmask, return kernel_set_mempolicy(mode, nmask, maxnode); } +SYSCALL_DEFINE3(set_mempolicy2, struct mpol_args __user *, uargs, size_t, usize, + unsigned long, flags) +{ + struct mpol_args kargs; + struct mempolicy_args margs; + int err; + nodemask_t policy_nodemask; + unsigned long __user *nodes_ptr; + + if (flags) + return -EINVAL; + + err = copy_struct_from_user(&kargs, sizeof(kargs), uargs, usize); + if (err) + return err; + + err = validate_mpol_flags(kargs.mode, &kargs.mode_flags); + if (err) + return err; + + memset(&margs, 0, sizeof(margs)); + margs.mode = kargs.mode; + margs.mode_flags = kargs.mode_flags; + if (kargs.pol_nodes) { + nodes_ptr = u64_to_user_ptr(kargs.pol_nodes); + err = get_nodes(&policy_nodemask, nodes_ptr, + kargs.pol_maxnodes); + if (err) + return err; + margs.policy_nodes = &policy_nodemask; + } else + margs.policy_nodes = NULL; + + return do_set_mempolicy(&margs); +} + static int kernel_migrate_pages(pid_t pid, unsigned long maxnode, const unsigned long __user *old_nodes, const unsigned long __user *new_nodes) diff --git a/tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl b/tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl index 116ff501bf92..bb1351df51d9 100644 --- a/tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl +++ b/tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl @@ -371,3 +371,4 @@ 454 n64 futex_wake sys_futex_wake 455 n64 futex_wait sys_futex_wait 456 n64 futex_requeue sys_futex_requeue +457 n64 set_mempolicy2 sys_set_mempolicy2 diff --git a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl index 7fab411378f2..4f03f5f42b78 100644 --- a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl +++ b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl @@ -543,3 +543,4 @@ 454 common futex_wake sys_futex_wake 455 common futex_wait sys_futex_wait 456 common futex_requeue sys_futex_requeue +457 common set_mempolicy2 sys_set_mempolicy2 diff --git a/tools/perf/arch/s390/entry/syscalls/syscall.tbl b/tools/perf/arch/s390/entry/syscalls/syscall.tbl index 86fec9b080f6..f98dadc2e9df 100644 --- a/tools/perf/arch/s390/entry/syscalls/syscall.tbl +++ b/tools/perf/arch/s390/entry/syscalls/syscall.tbl @@ -459,3 +459,4 @@ 454 common futex_wake sys_futex_wake sys_futex_wake 455 common futex_wait sys_futex_wait sys_futex_wait 456 common futex_requeue sys_futex_requeue sys_futex_requeue +457 common set_mempolicy2 sys_set_mempolicy2 sys_set_mempolicy2 diff --git a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl index 8cb8bf68721c..21f2579679d4 100644 --- a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl +++ b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl @@ -378,6 +378,7 @@ 454 common futex_wake sys_futex_wake 455 common futex_wait sys_futex_wait 456 common futex_requeue sys_futex_requeue +457 common set_mempolicy2 sys_set_mempolicy2 # # Due to a historical design error, certain syscalls are numbered differently