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move_pages.2
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Christoph Lameter
move_pages support in numactl
23 июл 2014, 21:02
23 июл 2014, 21:02
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.\" Hey Emacs! This file is -*- nroff -*- source. .\" .\" This manpage is Copyright (C) 2006 Silicon Graphics, Inc. .\" Christoph Lameter .\" .\" Permission is granted to make and distribute verbatim copies of this .\" manual provided the copyright notice and this permission notice are .\" preserved on all copies. .\" .\" Permission is granted to copy and distribute modified versions of this .\" manual under the conditions for verbatim copying, provided that the .\" entire resulting derived work is distributed under the terms of a .\" permission notice identical to this one. .\" .TH MOVE_PAGES 2 2006-10-31 "Linux 2.6.18" "Linux Programmer's Manual" .SH NAME move_pages \- Move individual pages of a process to another node .SH SYNOPSIS .B #include <numaif.h> .sp .BI "long move_pages(int " pid ", unsigned long count, void ** " pages ", const int * " nodes ", int * " status ", int " flags ); .SH DESCRIPTION .BR move_pages () moves .I count pages to the .I nodes. The result of the move is reflected in .I status. The .I flags indicate constraints on the pages to be moved. .I pid is the process id in which pages are to be moved. Sufficient rights must exist to move pages of another process. This means the moving process either has root priviledges, has SYS_NICE administrative rights or the same owner. If pid is 0 then we move pages of the current process. .I count is the number of pages to move. It defines the size of the three arrays .I pages, .I nodes and .I status. .I pages is an array of pointers to the pages that should be moved. These are pointers that should be aligned to page boundaries. Addresses are specified as seen by the process specified by .I pid. .I nodes is either an array of integers that specify the desired location for each page or it is NULL. Each integer is a node number. If NULL is specified then move_pages will not move any pages but return the node of each page in the .I status array. Having the status of each page may be necessary to determine pages that need to be moved. .I status is an array of integers that return the status of each page. The array only contains valid values if .I move_pages did not return an error code. .I flags specify what types of pages to move. .B MPOL_MF_MOVE means that only pages that are in exclusive use by the process are to be moved. .B MPOL_MF_MOVE_ALL means that pages shared between multiple processes can also be moved. The process must have root priviledges or SYS_NICE priviledges. .SH Page states in the status array .TP .B 0..MAX_NUMNODES Indicates that the location of the page is on this node. .TP .B -ENOENT The page is not present. .TP .B -EACCES The page is mapped by multiple processes and can only be moved if .I MPOL_MF_MOVE_ALL is specified. .TP .B -EBUSY The page is currently busy and cannot be moved. Try again later. This occurs if a page is undergoing I/O or another kernel subsystem is holding a reference to the page. .TP .B -EFAULT This is a zero page or the memory area is not mapped by the process. .TP .B -ENOMEM Unable to allocate memory on target node. .TP .B -EIO Unable to write back a page. The page has to be written back in order to move ti since the page is dirty and the filesystem has not provide a migration function that would allow the move of dirty pages. .TP .B -EINVAL A dirty page cannot be moved. The filesystem does not provide a migration function and has no ability to write back pages. .SH "RETURN VALUE" On success .B move_pages returns zero. .SH ERRORS .TP .B -ENOENT No pages were found that require moving. All pages are either already on the target node, not present, had an invalid address or could not be moved because they were mapped by multiple processes. .TP .B -EINVAL Flags other than .I MPOL_MF_MOVE and .I MPOL_MF_MOVE_ALL was specified or an attempt was made to migrate pages of a kernel thread. .TP .B -EPERM .I MPOL_MF_MOVE_ALL specified without sufficient privileges or an attempt to move a process belonging to another user. .TP .B -EACCESS On of the target nodes is not allowed by the current cpuset. .TP .B -ENODEV On of the target nodes is not online. .TP .B -ESRCH Process does not exist. .TP .B -E2BIG Too many pages to move. .TP .B -EFAULT Parameter array could not be accessed. .SH "SEE ALSO" .BR numa_maps (5), .BR migratepages (8), .BR numa_stat (8), .BR numa (3)