Unverified Commit 2a888818 authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
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!637 Introduce new memory policy for OLK-5.10 

Merge Pull Request from: @ma-wupeng 
 
Introduce new syscall set_mempolicy_home_node and mempolicy
MPOL_PREFERRED_MANY.

This patch series introduces the concept of the MPOL_PREFERRED_MANY mempolicy.
This mempolicy mode can be used with either the set_mempolicy(2) or mbind(2)
interfaces. Like the MPOL_PREFERRED interface, it allows an application to set a
preference for nodes which will fulfil memory allocation requests. Unlike the
MPOL_PREFERRED mode, it takes a set of nodes. Like the MPOL_BIND interface, it
works over a set of nodes. Unlike MPOL_BIND, it will not cause a SIGSEGV or
invoke the OOM killer if those preferred nodes are not available.

mm: add new syscall set_mempolicy_home_node 
 
Link:https://gitee.com/openeuler/kernel/pulls/637

 

Reviewed-by: default avatarKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: default avatarJialin Zhang <zhangjialin11@huawei.com>
parents 1a32e08f 160c26bc

Documentation/admin-guide/mm/numa_memory_policy.rst

+26 −5
Original line number Diff line number Diff line
@@ -245,6 +245,13 @@ MPOL_INTERLEAVED 
	address range or file.  During system boot up, the temporary

	interleaved system default policy works in this mode.



MPOL_PREFERRED_MANY

	This mode specifices that the allocation should be preferrably

	satisfied from the nodemask specified in the policy. If there is

	a memory pressure on all nodes in the nodemask, the allocation

	can fall back to all existing numa nodes. This is effectively

	MPOL_PREFERRED allowed for a mask rather than a single node.



NUMA memory policy supports the following optional mode flags:



MPOL_F_STATIC_NODES
@@ -253,10 +260,10 @@ MPOL_F_STATIC_NODES 
	nodes changes after the memory policy has been defined.



	Without this flag, any time a mempolicy is rebound because of a

	change in the set of allowed nodes, the node (Preferred) or

	nodemask (Bind, Interleave) is remapped to the new set of

	allowed nodes.  This may result in nodes being used that were

	previously undesired.

        change in the set of allowed nodes, the preferred nodemask (Preferred

        Many), preferred node (Preferred) or nodemask (Bind, Interleave) is

        remapped to the new set of allowed nodes.  This may result in nodes

        being used that were previously undesired.



	With this flag, if the user-specified nodes overlap with the

	nodes allowed by the task's cpuset, then the memory policy is
@@ -401,7 +408,7 @@ follows: 
Memory Policy APIs

==================



Linux supports 3 system calls for controlling memory policy.  These APIS

Linux supports 4 system calls for controlling memory policy.  These APIS

always affect only the calling task, the calling task's address space, or

some shared object mapped into the calling task's address space.
@@ -453,6 +460,20 @@ requested via the 'flags' argument. 


See the mbind(2) man page for more details.



Set home node for a Range of Task's Address Spacec::



	long sys_set_mempolicy_home_node(unsigned long start, unsigned long len,

					 unsigned long home_node,

					 unsigned long flags);



sys_set_mempolicy_home_node set the home node for a VMA policy present in the

task's address range. The system call updates the home node only for the existing

mempolicy range. Other address ranges are ignored. A home node is the NUMA node

closest to which page allocation will come from. Specifying the home node override

the default allocation policy to allocate memory close to the local node for an

executing CPU.





Memory Policy Command Line Interface

====================================

arch/alpha/kernel/syscalls/syscall.tbl

+1 −0
Original line number Diff line number Diff line
@@ -483,3 +483,4 @@ 
554	common	landlock_create_ruleset		sys_landlock_create_ruleset

555	common	landlock_add_rule		sys_landlock_add_rule

556	common	landlock_restrict_self		sys_landlock_restrict_self

560	common	set_mempolicy_home_node		sys_ni_syscall

arch/arm/tools/syscall.tbl

+1 −1
Original line number Diff line number Diff line
@@ -463,7 +463,7 @@ 
447	common	kabi_reserved447		sys_ni_syscall

448	common	kabi_reserved448		sys_ni_syscall

449	common	kabi_reserved449		sys_ni_syscall

450	common	kabi_reserved450		sys_ni_syscall

450	common	set_mempolicy_home_node		sys_set_mempolicy_home_node

451	common	kabi_reserved451		sys_ni_syscall

452	common	kabi_reserved452		sys_ni_syscall

453	common	kabi_reserved453		sys_ni_syscall

arch/arm64/include/asm/unistd.h

+0 −1
Original line number Diff line number Diff line
@@ -42,7 +42,6 @@ 
#define __ARM_NR_compat_cacheflush	(__ARM_NR_COMPAT_BASE + 2)

#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

#endif

arch/arm64/include/asm/unistd32.h

+2 −2
Original line number Diff line number Diff line
@@ -908,8 +908,8 @@ __SYSCALL(__NR_kabi_reserved447, sys_ni_syscall) 
__SYSCALL(__NR_kabi_reserved448, sys_ni_syscall)

#define __NR_kabi_reserved449 449

__SYSCALL(__NR_kabi_reserved449, sys_ni_syscall)

#define __NR_kabi_reserved450 450

__SYSCALL(__NR_kabi_reserved450, sys_ni_syscall)

#define __NR_set_mempolicy_home_node 450

__SYSCALL(__NR_set_mempolicy_home_node, sys_set_mempolicy_home_node)

#define __NR_kabi_reserved451 451

__SYSCALL(__NR_kabi_reserved451, sys_ni_syscall)

#define __NR_kabi_reserved452 452