2006-02-08 03:20:44 +00:00
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.\" Copyright 2003,2004 Andi Kleen, SuSE Labs.
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2007-08-27 11:01:10 +00:00
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.\" and Copyright 2007 Lee Schermerhorn, Hewlett Packard
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2006-02-08 03:20:44 +00:00
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.\"
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2013-03-10 09:29:06 +00:00
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.\" %%%LICENSE_START(VERBATIM_PROF)
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2006-02-08 03:20:44 +00:00
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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2007-04-12 22:42:49 +00:00
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.\"
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2006-02-08 03:20:44 +00:00
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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2007-04-12 22:42:49 +00:00
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.\" the use of the information contained herein.
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.\"
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2006-02-08 03:20:44 +00:00
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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2013-03-10 09:29:06 +00:00
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.\" %%%LICENSE_END
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2007-04-12 22:42:49 +00:00
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.\"
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2006-02-08 03:20:44 +00:00
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.\" 2006-02-03, mtk, substantial wording changes and other improvements
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2007-08-27 11:34:07 +00:00
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.\" 2007-08-27, Lee Schermerhorn <Lee.Schermerhorn@hp.com>
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.\" more precise specification of behavior.
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2006-02-08 03:20:44 +00:00
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.\"
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add_key.2, chown.2, epoll_ctl.2, epoll_wait.2, execve.2, fcntl.2, get_mempolicy.2, getxattr.2, ioctl.2, keyctl.2, listxattr.2, mkdir.2, mknod.2, mmap.2, msync.2, nfsservctl.2, open.2, prctl.2, removexattr.2, request_key.2, sendfile.2, set_mempolicy.2, setxattr.2, shmget.2, shutdown.2, sigaction.2, syslog.2, truncate.2, umask.2, CPU_SET.3, atexit.3, bsearch.3, cmsg.3, err.3, gethostid.3, getmntent.3, getopt.3, iconv_close.3, inet_ntop.3, longjmp.3, lsearch.3, mcheck.3, on_exit.3, putpwent.3, regex.3, resolver.3, setbuf.3, setjmp.3, setlocale.3, setlogmask.3, sleep.3, strsignal.3, sysconf.3, undocumented.3, tty_ioctl.4, proc.5, resolv.conf.5, tzfile.5, aio.7, bootparam.7, capabilities.7, fanotify.7, inotify.7, ip.7, packet.7, pthreads.7, raw.7, signal.7, socket.7, unix.7, ld.so.8, nscd.8: tstamp
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2015-05-07 06:26:32 +00:00
|
|
|
.TH SET_MEMPOLICY 2 2015-05-07 Linux "Linux Programmer's Manual"
|
2006-02-08 03:20:44 +00:00
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|
|
.SH NAME
|
2015-04-30 10:31:09 +00:00
|
|
|
set_mempolicy \- set default NUMA memory policy for a thread and its children
|
2006-02-08 03:20:44 +00:00
|
|
|
.SH SYNOPSIS
|
2007-04-03 14:04:54 +00:00
|
|
|
.nf
|
2007-04-12 22:42:49 +00:00
|
|
|
.B "#include <numaif.h>"
|
2006-02-08 03:20:44 +00:00
|
|
|
.sp
|
2014-05-19 23:02:08 +00:00
|
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|
.BI "long set_mempolicy(int " mode ", const unsigned long *" nodemask ,
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|
|
|
.BI " unsigned long " maxnode );
|
2007-08-27 11:01:10 +00:00
|
|
|
.sp
|
2009-02-23 18:40:41 +00:00
|
|
|
Link with \fI\-lnuma\fP.
|
2007-04-03 14:04:54 +00:00
|
|
|
.fi
|
2006-02-08 03:20:44 +00:00
|
|
|
.SH DESCRIPTION
|
|
|
|
.BR set_mempolicy ()
|
2015-04-30 10:31:09 +00:00
|
|
|
sets the NUMA memory policy of the calling thread,
|
2007-08-27 11:01:10 +00:00
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|
|
which consists of a policy mode and zero or more nodes,
|
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|
|
to the values specified by the
|
|
|
|
.IR mode ,
|
|
|
|
.I nodemask
|
|
|
|
and
|
2007-09-20 16:26:31 +00:00
|
|
|
.I maxnode
|
2007-08-27 11:01:10 +00:00
|
|
|
arguments.
|
2006-02-08 03:20:44 +00:00
|
|
|
|
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|
|
A NUMA machine has different
|
|
|
|
memory controllers with different distances to specific CPUs.
|
2007-08-27 11:01:10 +00:00
|
|
|
The memory policy defines from which node memory is allocated for
|
2015-04-30 10:31:09 +00:00
|
|
|
the thread.
|
2006-02-08 03:20:44 +00:00
|
|
|
|
2015-04-30 10:31:09 +00:00
|
|
|
This system call defines the default policy for the thread.
|
|
|
|
The thread policy governs allocation of pages in the process's
|
2007-08-27 11:01:10 +00:00
|
|
|
address space outside of memory ranges
|
|
|
|
controlled by a more specific policy set by
|
2006-02-08 03:20:44 +00:00
|
|
|
.BR mbind (2).
|
2015-04-30 10:31:09 +00:00
|
|
|
The thread default policy also controls allocation of any pages for
|
2014-01-04 22:00:31 +00:00
|
|
|
memory-mapped files mapped using the
|
2007-08-27 11:01:10 +00:00
|
|
|
.BR mmap (2)
|
|
|
|
call with the
|
|
|
|
.B MAP_PRIVATE
|
2016-10-13 07:38:59 +00:00
|
|
|
flag and that are only read (loaded) from by the thread
|
2014-01-04 22:00:31 +00:00
|
|
|
and of memory-mapped files mapped using the
|
2007-08-27 11:01:10 +00:00
|
|
|
.BR mmap (2)
|
|
|
|
call with the
|
|
|
|
.B MAP_SHARED
|
|
|
|
flag, regardless of the access type.
|
intro.1, _syscall.2, access.2, arch_prctl.2, cacheflush.2, chown.2, clock_getres.2, clone.2, create_module.2, fcntl.2, flock.2, get_kernel_syms.2, get_robust_list.2, get_thread_area.2, getcpu.2, getpriority.2, getrlimit.2, getrusage.2, ioprio_set.2, kexec_load.2, madvise.2, mbind.2, migrate_pages.2, mknod.2, mmap.2, mount.2, move_pages.2, mprotect.2, open.2, pause.2, pciconfig_read.2, perf_event_open.2, prctl.2, ptrace.2, query_module.2, read.2, reboot.2, recv.2, s390_runtime_instr.2, sched_setscheduler.2, select_tut.2, send.2, set_mempolicy.2, setfsgid.2, setfsuid.2, sigaction.2, spu_create.2, spu_run.2, stime.2, swapon.2, syslog.2, timer_create.2, timer_getoverrun.2, times.2, tkill.2, umount.2, unimplemented.2, ustat.2, vm86.2, wait.2, abs.3, aio_read.3, aio_write.3, bsd_signal.3, catgets.3, clearenv.3, cmsg.3, dbopen.3, dirfd.3, dlopen.3, exec.3, fenv.3, ferror.3, fmemopen.3, fnmatch.3, fopen.3, futimes.3, getaddrinfo.3, getifaddrs.3, getipnodebyname.3, hsearch.3, if_nameindex.3, inet_pton.3, mblen.3, mbrlen.3, mbsrtowcs.3, mbtowc.3, mcheck.3, memfrob.3, mq_notify.3, netlink.3, posix_memalign.3, printf.3, pthread_attr_setscope.3, pthread_cleanup_push.3, pthread_kill_other_threads_np.3, pthread_self.3, pthread_setcancelstate.3, pthread_setconcurrency.3, raise.3, resolver.3, rpc.3, rtime.3, rtnetlink.3, scanf.3, setbuf.3, setnetgrent.3, shm_open.3, sigpause.3, sigset.3, sigwait.3, sockatmark.3, strcasecmp.3, strcmp.3, strdup.3, strftime.3, strptime.3, strsignal.3, strverscmp.3, sysv_signal.3, termios.3, wcrtomb.3, wcsnlen.3, wcsnrtombs.3, wcsrtombs.3, wctomb.3, wprintf.3, console_codes.4, cpuid.4, msr.4, rtc.4, sk98lin.4, st.4, tty.4, charmap.5, core.5, elf.5, hosts.equiv.5, proc.5, resolv.conf.5, services.5, slabinfo.5, arp.7, bootparam.7, capabilities.7, charsets.7, cpuset.7, ddp.7, epoll.7, feature_test_macros.7, futex.7, hier.7, icmp.7, inotify.7, ip.7, ipv6.7, man-pages.7, mdoc.7, mdoc.samples.7, netdevice.7, netlink.7, numa.7, packet.7, path_resolution.7, posixoptions.7, pthreads.7, raw.7, rtld-audit.7, rtnetlink.7, sem_overview.7, sigevent.7, socket.7, spufs.7, tcp.7, udp.7, unicode.7, uri.7, utf-8.7, intro.8, ldconfig.8, sync.8: Global fix: fix placement of word "only"
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-03-31 08:53:00 +00:00
|
|
|
The policy is applied only when a new page is allocated
|
2015-04-30 10:31:09 +00:00
|
|
|
for the thread.
|
2007-04-12 22:42:49 +00:00
|
|
|
For anonymous memory this is when the page is first
|
2015-04-30 10:31:09 +00:00
|
|
|
touched by the thread.
|
2006-02-08 03:20:44 +00:00
|
|
|
|
2007-08-27 11:01:10 +00:00
|
|
|
The
|
|
|
|
.I mode
|
|
|
|
argument must specify one of
|
2006-02-08 03:20:44 +00:00
|
|
|
.BR MPOL_DEFAULT ,
|
|
|
|
.BR MPOL_BIND ,
|
2014-02-07 21:11:51 +00:00
|
|
|
.BR MPOL_INTERLEAVE ,
|
2016-10-10 16:23:10 +00:00
|
|
|
.BR MPOL_PREFERRED ,
|
2007-08-27 11:01:10 +00:00
|
|
|
or
|
2016-10-13 06:52:46 +00:00
|
|
|
.BR MPOL_LOCAL
|
|
|
|
(which are described in detail below).
|
2007-08-27 11:01:10 +00:00
|
|
|
All modes except
|
2006-02-08 03:20:44 +00:00
|
|
|
.B MPOL_DEFAULT
|
2016-10-13 07:15:19 +00:00
|
|
|
require the caller to specify the node or nodes to which the mode applies,
|
|
|
|
via the
|
2007-04-12 22:42:49 +00:00
|
|
|
.I nodemask
|
2016-10-13 07:15:19 +00:00
|
|
|
argument.
|
2007-08-27 11:01:10 +00:00
|
|
|
|
2008-08-11 05:11:50 +00:00
|
|
|
The
|
|
|
|
.I mode
|
|
|
|
argument may also include an optional
|
2008-08-13 08:20:30 +00:00
|
|
|
.IR "mode flag" .
|
2008-08-11 05:11:50 +00:00
|
|
|
The supported
|
|
|
|
.I "mode flags"
|
|
|
|
are:
|
|
|
|
.TP
|
|
|
|
.BR MPOL_F_STATIC_NODES " (since Linux 2.6.26)"
|
mbind.2, rename.2, sched_setscheduler.2, set_mempolicy.2, syslog.2, argz_add.3, dlopen.3, scanf.3, strtod.3, strtok.3, tcgetpgrp.3, hd.4, cpuset.7, regex.7, ld.so.8: Global fix: s/non-empty/nonempty/
The tendency in English, as prescribed in style guides like
Chicago MoS, is towards removing hyphens after prefixes
like "non-" etc.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-01-16 16:41:47 +00:00
|
|
|
A nonempty
|
2008-08-11 05:11:50 +00:00
|
|
|
.I nodemask
|
2016-10-13 07:16:52 +00:00
|
|
|
specifies physical node IDs.
|
2014-04-23 11:58:43 +00:00
|
|
|
Linux will not remap the
|
2008-08-11 05:11:50 +00:00
|
|
|
.I nodemask
|
|
|
|
when the process moves to a different cpuset context,
|
|
|
|
nor when the set of nodes allowed by the process's
|
|
|
|
current cpuset context changes.
|
|
|
|
.TP
|
|
|
|
.BR MPOL_F_RELATIVE_NODES " (since Linux 2.6.26)"
|
mbind.2, rename.2, sched_setscheduler.2, set_mempolicy.2, syslog.2, argz_add.3, dlopen.3, scanf.3, strtod.3, strtok.3, tcgetpgrp.3, hd.4, cpuset.7, regex.7, ld.so.8: Global fix: s/non-empty/nonempty/
The tendency in English, as prescribed in style guides like
Chicago MoS, is towards removing hyphens after prefixes
like "non-" etc.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-01-16 16:41:47 +00:00
|
|
|
A nonempty
|
2008-08-11 05:11:50 +00:00
|
|
|
.I nodemask
|
2016-10-13 07:16:52 +00:00
|
|
|
specifies node IDs that are relative to the set of
|
|
|
|
node IDs allowed by the process's current cpuset.
|
2008-08-11 05:11:50 +00:00
|
|
|
.PP
|
2007-04-12 22:42:49 +00:00
|
|
|
.I nodemask
|
2007-08-27 11:34:07 +00:00
|
|
|
points to a bit mask of node IDs that contains up to
|
2006-02-08 03:20:44 +00:00
|
|
|
.I maxnode
|
2007-04-12 22:42:49 +00:00
|
|
|
bits.
|
2007-08-27 11:01:10 +00:00
|
|
|
The bit mask size is rounded to the next multiple of
|
2007-04-12 22:42:49 +00:00
|
|
|
.IR "sizeof(unsigned long)" ,
|
intro.1, _syscall.2, access.2, arch_prctl.2, cacheflush.2, chown.2, clock_getres.2, clone.2, create_module.2, fcntl.2, flock.2, get_kernel_syms.2, get_robust_list.2, get_thread_area.2, getcpu.2, getpriority.2, getrlimit.2, getrusage.2, ioprio_set.2, kexec_load.2, madvise.2, mbind.2, migrate_pages.2, mknod.2, mmap.2, mount.2, move_pages.2, mprotect.2, open.2, pause.2, pciconfig_read.2, perf_event_open.2, prctl.2, ptrace.2, query_module.2, read.2, reboot.2, recv.2, s390_runtime_instr.2, sched_setscheduler.2, select_tut.2, send.2, set_mempolicy.2, setfsgid.2, setfsuid.2, sigaction.2, spu_create.2, spu_run.2, stime.2, swapon.2, syslog.2, timer_create.2, timer_getoverrun.2, times.2, tkill.2, umount.2, unimplemented.2, ustat.2, vm86.2, wait.2, abs.3, aio_read.3, aio_write.3, bsd_signal.3, catgets.3, clearenv.3, cmsg.3, dbopen.3, dirfd.3, dlopen.3, exec.3, fenv.3, ferror.3, fmemopen.3, fnmatch.3, fopen.3, futimes.3, getaddrinfo.3, getifaddrs.3, getipnodebyname.3, hsearch.3, if_nameindex.3, inet_pton.3, mblen.3, mbrlen.3, mbsrtowcs.3, mbtowc.3, mcheck.3, memfrob.3, mq_notify.3, netlink.3, posix_memalign.3, printf.3, pthread_attr_setscope.3, pthread_cleanup_push.3, pthread_kill_other_threads_np.3, pthread_self.3, pthread_setcancelstate.3, pthread_setconcurrency.3, raise.3, resolver.3, rpc.3, rtime.3, rtnetlink.3, scanf.3, setbuf.3, setnetgrent.3, shm_open.3, sigpause.3, sigset.3, sigwait.3, sockatmark.3, strcasecmp.3, strcmp.3, strdup.3, strftime.3, strptime.3, strsignal.3, strverscmp.3, sysv_signal.3, termios.3, wcrtomb.3, wcsnlen.3, wcsnrtombs.3, wcsrtombs.3, wctomb.3, wprintf.3, console_codes.4, cpuid.4, msr.4, rtc.4, sk98lin.4, st.4, tty.4, charmap.5, core.5, elf.5, hosts.equiv.5, proc.5, resolv.conf.5, services.5, slabinfo.5, arp.7, bootparam.7, capabilities.7, charsets.7, cpuset.7, ddp.7, epoll.7, feature_test_macros.7, futex.7, hier.7, icmp.7, inotify.7, ip.7, ipv6.7, man-pages.7, mdoc.7, mdoc.samples.7, netdevice.7, netlink.7, numa.7, packet.7, path_resolution.7, posixoptions.7, pthreads.7, raw.7, rtld-audit.7, rtnetlink.7, sem_overview.7, sigevent.7, socket.7, spufs.7, tcp.7, udp.7, unicode.7, uri.7, utf-8.7, intro.8, ldconfig.8, sync.8: Global fix: fix placement of word "only"
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-03-31 08:53:00 +00:00
|
|
|
but the kernel will use bits only up to
|
2006-02-08 03:20:44 +00:00
|
|
|
.IR maxnode .
|
2007-08-27 11:01:10 +00:00
|
|
|
A NULL value of
|
|
|
|
.I nodemask
|
|
|
|
or a
|
|
|
|
.I maxnode
|
|
|
|
value of zero specifies the empty set of nodes.
|
|
|
|
If the value of
|
|
|
|
.I maxnode
|
|
|
|
is zero,
|
|
|
|
the
|
|
|
|
.I nodemask
|
|
|
|
argument is ignored.
|
2008-08-11 05:11:50 +00:00
|
|
|
|
2008-08-07 12:19:08 +00:00
|
|
|
Where a
|
|
|
|
.I nodemask
|
|
|
|
is required, it must contain at least one node that is on-line,
|
|
|
|
allowed by the process's current cpuset context,
|
2016-10-13 07:05:58 +00:00
|
|
|
(unless the
|
2008-08-11 05:11:50 +00:00
|
|
|
.B MPOL_F_STATIC_NODES
|
2016-10-13 07:05:58 +00:00
|
|
|
mode flag is specified),
|
2008-08-07 12:19:08 +00:00
|
|
|
and contains memory.
|
2008-08-11 05:11:50 +00:00
|
|
|
If the
|
|
|
|
.B MPOL_F_STATIC_NODES
|
|
|
|
is set in
|
|
|
|
.I mode
|
|
|
|
and a required
|
|
|
|
.I nodemask
|
|
|
|
contains no nodes that are allowed by the process's current cpuset context,
|
|
|
|
the memory policy reverts to
|
|
|
|
.IR "local allocation" .
|
|
|
|
This effectively overrides the specified policy until the process's
|
|
|
|
cpuset context includes one or more of the nodes specified by
|
2011-09-23 05:17:13 +00:00
|
|
|
.IR nodemask .
|
2006-02-08 03:20:44 +00:00
|
|
|
|
2007-04-12 22:42:49 +00:00
|
|
|
The
|
2016-10-13 07:10:13 +00:00
|
|
|
.I mode
|
|
|
|
argument must include one of the following values:
|
|
|
|
.TP
|
2006-02-08 03:20:44 +00:00
|
|
|
.B MPOL_DEFAULT
|
2016-10-13 07:10:13 +00:00
|
|
|
This mode specifies that any nondefault thread memory policy be removed,
|
2008-08-11 05:11:50 +00:00
|
|
|
so that the memory policy "falls back" to the system default policy.
|
2014-01-01 03:15:14 +00:00
|
|
|
The system default policy is "local allocation"\(emthat is,
|
|
|
|
allocate memory on the node of the CPU that triggered the allocation.
|
2007-04-12 22:42:49 +00:00
|
|
|
.I nodemask
|
2007-08-27 11:01:10 +00:00
|
|
|
must be specified as NULL.
|
|
|
|
If the "local node" contains no free memory, the system will
|
|
|
|
attempt to allocate memory from a "near by" node.
|
2016-10-13 07:10:13 +00:00
|
|
|
.TP
|
2006-02-08 03:20:44 +00:00
|
|
|
.B MPOL_BIND
|
2016-10-13 07:10:13 +00:00
|
|
|
This mode defines a strict policy that restricts memory allocation to the
|
2007-04-12 22:42:49 +00:00
|
|
|
nodes specified in
|
2006-02-08 03:20:44 +00:00
|
|
|
.IR nodemask .
|
2007-08-27 11:01:10 +00:00
|
|
|
If
|
|
|
|
.I nodemask
|
|
|
|
specifies more than one node, page allocations will come from
|
2007-08-27 11:34:07 +00:00
|
|
|
the node with the lowest numeric node ID first, until that node
|
2007-08-27 11:01:10 +00:00
|
|
|
contains no free memory.
|
|
|
|
Allocations will then come from the node with the next highest
|
2007-08-27 11:34:07 +00:00
|
|
|
node ID specified in
|
2007-08-27 11:01:10 +00:00
|
|
|
.I nodemask
|
|
|
|
and so forth, until none of the specified nodes contain free memory.
|
|
|
|
Pages will not be allocated from any node not specified in the
|
|
|
|
.IR nodemask .
|
2006-02-08 03:20:44 +00:00
|
|
|
|
2016-10-13 07:10:13 +00:00
|
|
|
.TP
|
2006-02-08 03:20:44 +00:00
|
|
|
.B MPOL_INTERLEAVE
|
2016-10-13 07:10:13 +00:00
|
|
|
This mode interleaves page allocations across the nodes specified in
|
2007-08-27 11:01:10 +00:00
|
|
|
.I nodemask
|
2007-08-27 11:34:07 +00:00
|
|
|
in numeric node ID order.
|
2007-08-27 11:01:10 +00:00
|
|
|
This optimizes for bandwidth instead of latency
|
|
|
|
by spreading out pages and memory accesses to those pages across
|
|
|
|
multiple nodes.
|
|
|
|
However, accesses to a single page will still be limited to
|
|
|
|
the memory bandwidth of a single node.
|
|
|
|
.\" NOTE: the following sentence doesn't make sense in the context
|
|
|
|
.\" of set_mempolicy() -- no memory area specified.
|
|
|
|
.\" To be effective the memory area should be fairly large,
|
|
|
|
.\" at least 1MB or bigger.
|
2016-10-13 07:10:13 +00:00
|
|
|
.TP
|
2006-02-08 03:20:44 +00:00
|
|
|
.B MPOL_PREFERRED
|
2016-10-13 07:10:13 +00:00
|
|
|
This mode sets the preferred node for allocation.
|
2007-08-27 11:01:10 +00:00
|
|
|
The kernel will try to allocate pages from this node first
|
|
|
|
and fall back to "near by" nodes if the preferred node is low on free
|
2007-04-12 22:42:49 +00:00
|
|
|
memory.
|
2007-08-27 11:01:10 +00:00
|
|
|
If
|
|
|
|
.I nodemask
|
2007-08-27 11:34:07 +00:00
|
|
|
specifies more than one node ID, the first node in the
|
2007-08-27 11:01:10 +00:00
|
|
|
mask will be selected as the preferred node.
|
|
|
|
If the
|
2007-04-12 22:42:49 +00:00
|
|
|
.I nodemask
|
2007-08-27 11:01:10 +00:00
|
|
|
and
|
|
|
|
.I maxnode
|
2008-08-11 05:21:24 +00:00
|
|
|
arguments specify the empty set, then the policy
|
|
|
|
specifies "local allocation"
|
|
|
|
(like the system default policy discussed above).
|
2016-10-13 07:10:13 +00:00
|
|
|
.TP
|
2016-10-13 07:04:40 +00:00
|
|
|
.BR MPOL_LOCAL " (since Linux 3.8)"
|
|
|
|
.\" commit 479e2802d09f1e18a97262c4c6f8f17ae5884bd8
|
|
|
|
.\" commit f2a07f40dbc603c15f8b06e6ec7f768af67b424f
|
2016-10-13 07:10:13 +00:00
|
|
|
This mode specifies "local allocation"; the memory is allocated on
|
2016-10-12 07:49:31 +00:00
|
|
|
the node of the CPU that triggered the allocation (the "local node").
|
2016-10-10 16:23:10 +00:00
|
|
|
The
|
|
|
|
.I nodemask
|
|
|
|
and
|
|
|
|
.I maxnode
|
2016-10-12 07:46:56 +00:00
|
|
|
arguments must specify the empty set.
|
2016-10-12 07:49:31 +00:00
|
|
|
If the "local node" is low on free memory,
|
2016-10-12 07:46:56 +00:00
|
|
|
the kernel will try to allocate memory from other nodes.
|
|
|
|
The kernel will allocate memory from the "local node"
|
|
|
|
whenever memory for this node is available.
|
2016-10-12 07:49:31 +00:00
|
|
|
If the "local node" is not allowed by the process's current cpuset context,
|
2016-10-12 07:46:56 +00:00
|
|
|
the kernel will try to allocate memory from other nodes.
|
|
|
|
The kernel will allocate memory from the "local node" whenever
|
|
|
|
it becomes allowed by the process's current cpuset context.
|
2016-10-13 07:10:13 +00:00
|
|
|
.PP
|
2015-04-30 10:31:09 +00:00
|
|
|
The thread memory policy is preserved across an
|
2006-09-04 08:21:37 +00:00
|
|
|
.BR execve (2),
|
2015-04-30 10:31:09 +00:00
|
|
|
and is inherited by child threads created using
|
2007-04-12 22:42:49 +00:00
|
|
|
.BR fork (2)
|
|
|
|
or
|
2006-02-08 03:20:44 +00:00
|
|
|
.BR clone (2).
|
|
|
|
.SH RETURN VALUE
|
|
|
|
On success,
|
|
|
|
.BR set_mempolicy ()
|
|
|
|
returns 0;
|
|
|
|
on error, \-1 is returned and
|
2007-04-12 22:42:49 +00:00
|
|
|
.I errno
|
2006-02-08 03:20:44 +00:00
|
|
|
is set to indicate the error.
|
2007-08-27 11:01:10 +00:00
|
|
|
.SH ERRORS
|
|
|
|
.TP
|
2007-10-23 06:21:25 +00:00
|
|
|
.B EFAULT
|
|
|
|
Part of all of the memory range specified by
|
|
|
|
.I nodemask
|
|
|
|
and
|
|
|
|
.I maxnode
|
|
|
|
points outside your accessible address space.
|
|
|
|
.TP
|
2007-08-27 11:01:10 +00:00
|
|
|
.B EINVAL
|
2007-12-22 16:56:03 +00:00
|
|
|
.I mode
|
|
|
|
is invalid.
|
2007-08-27 11:01:10 +00:00
|
|
|
Or,
|
|
|
|
.I mode
|
|
|
|
is
|
2007-08-27 11:34:07 +00:00
|
|
|
.B MPOL_DEFAULT
|
2007-08-27 11:01:10 +00:00
|
|
|
and
|
|
|
|
.I nodemask
|
mbind.2, rename.2, sched_setscheduler.2, set_mempolicy.2, syslog.2, argz_add.3, dlopen.3, scanf.3, strtod.3, strtok.3, tcgetpgrp.3, hd.4, cpuset.7, regex.7, ld.so.8: Global fix: s/non-empty/nonempty/
The tendency in English, as prescribed in style guides like
Chicago MoS, is towards removing hyphens after prefixes
like "non-" etc.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-01-16 16:41:47 +00:00
|
|
|
is nonempty,
|
2007-08-27 11:01:10 +00:00
|
|
|
or
|
|
|
|
.I mode
|
|
|
|
is
|
2007-08-27 11:34:07 +00:00
|
|
|
.B MPOL_BIND
|
2007-08-27 11:01:10 +00:00
|
|
|
or
|
2007-08-27 11:34:07 +00:00
|
|
|
.B MPOL_INTERLEAVE
|
2007-08-27 11:01:10 +00:00
|
|
|
and
|
|
|
|
.I nodemask
|
|
|
|
is empty.
|
|
|
|
Or,
|
|
|
|
.I maxnode
|
|
|
|
specifies more than a page worth of bits.
|
|
|
|
Or,
|
|
|
|
.I nodemask
|
2007-08-27 11:34:07 +00:00
|
|
|
specifies one or more node IDs that are
|
2008-08-07 12:19:08 +00:00
|
|
|
greater than the maximum supported node ID.
|
2007-08-27 11:34:07 +00:00
|
|
|
Or, none of the node IDs specified by
|
2007-08-27 11:01:10 +00:00
|
|
|
.I nodemask
|
2008-08-07 12:19:08 +00:00
|
|
|
are on-line and allowed by the process's current cpuset context,
|
|
|
|
or none of the specified nodes contain memory.
|
2008-08-11 05:11:50 +00:00
|
|
|
Or, the
|
|
|
|
.I mode
|
|
|
|
argument specified both
|
|
|
|
.B MPOL_F_STATIC_NODES
|
|
|
|
and
|
|
|
|
.BR MPOL_F_RELATIVE_NODES .
|
2007-08-27 11:01:10 +00:00
|
|
|
.TP
|
|
|
|
.B ENOMEM
|
|
|
|
Insufficient kernel memory was available.
|
2008-08-13 08:20:30 +00:00
|
|
|
.SH VERSIONS
|
|
|
|
The
|
2016-10-13 07:22:30 +00:00
|
|
|
.BR set_mempolicy ()
|
2008-08-13 08:20:30 +00:00
|
|
|
system call was added to the Linux kernel in version 2.6.7.
|
2006-08-04 09:41:28 +00:00
|
|
|
.SH CONFORMING TO
|
2007-12-25 21:28:09 +00:00
|
|
|
This system call is Linux-specific.
|
2007-05-18 16:06:42 +00:00
|
|
|
.SH NOTES
|
2015-04-30 10:31:09 +00:00
|
|
|
Memory policy is not remembered if the page is swapped out.
|
2007-08-27 11:01:10 +00:00
|
|
|
When such a page is paged back in, it will use the policy of
|
2015-04-30 10:31:09 +00:00
|
|
|
the thread or memory range that is in effect at the time the
|
2007-08-27 11:01:10 +00:00
|
|
|
page is allocated.
|
2008-08-13 08:20:30 +00:00
|
|
|
|
|
|
|
For information on library support, see
|
|
|
|
.BR numa (7).
|
2006-02-08 03:20:44 +00:00
|
|
|
.SH SEE ALSO
|
2008-07-03 12:20:42 +00:00
|
|
|
.BR get_mempolicy (2),
|
2008-07-14 15:52:21 +00:00
|
|
|
.BR getcpu (2),
|
2006-02-08 03:20:44 +00:00
|
|
|
.BR mbind (2),
|
2007-08-27 11:01:10 +00:00
|
|
|
.BR mmap (2),
|
2008-06-17 08:32:41 +00:00
|
|
|
.BR numa (3),
|
|
|
|
.BR cpuset (7),
|
2008-08-13 08:20:30 +00:00
|
|
|
.BR numa (7),
|
2008-06-17 08:32:41 +00:00
|
|
|
.BR numactl (8)
|