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Michael Kerrisk 2006-06-20 08:00:10 +00:00
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man2/ioprio_set.2
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@ -1,38 +1,26 @@
.\" This is _*_ nroff _*_ source. Emacs, gimme all those colors :)
.\"
.\" Copyright (c) International Business Machines Corp., 2006
.\" Copyright (c) International Business Machines orp., 2006
.\"
.\" This program is free software; you can redistribute it and/or
.\" This program is free software; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
.\"
.\" This program is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
.\" the GNU General Public License for more details.
.\"
.\" You should have received a copy of the GNU General Public License
.\" along with this program; if not, write to the Free Software
.\" along with this program; if not, write to the Free Software
.\" Foundation, Inc., 59 Temple Place, Suite 330, Boston,
.\" MA 02111-1307 USA
.\"
.\" HISTORY:
.\" 2006-04-27, created by Eduardo M. Fleury <efleury@br.ibm.com>
.\" with various additions by Michael Kerrisk <mtk-manpages@gmx.net>
.\" with various additions by Michael Kerrisk <mtk-manpages@gmx.net>
.\"
.\" FIXME Documentation/block/ioprio.txt says:
.\" With the introduction of cfq v3 (aka cfq-ts or time sliced
.\" cfq), basic io priorities is supported for reads on files.
.\" Does some of this text need to be worked into the man page?
.\" Especially "supported for reads on files".
.\"
.\" FIXME
.\" We have some general problems:
.\" These calls aren't in glibc yet. Why aren't they there yet?
.\" Ask Jens Axboe about this. Perhaps something needs to be pushed
.\" to Ulrich Drepper so that suitable stuff ends up in the glibc
.\" tree.
.\"
.TH IOPRIO_GET 2 2006-04-27 "2.6.13" "Linux Programmer's Manual"
.SH NAME
@ -103,7 +91,7 @@ is the highest priority class;
.B IOPRIO_CLASS_IDLE
is the lowest)
or if it belongs to the same priority class as the other process but
has a lower priority number (a lower priority number means a
has a higher priority level (a lower priority number means a
higher priority level).
The
@ -148,6 +136,12 @@ component.
.PP
See the NOTES section for more
information on scheduling classes and priorities.
I/O priorities are supported for reads and for synchronous (O_DIRECT,
O_SYNC) writes. I/O priorities are not supported for asynchronous
writes because they are issued outside the context of the program
dirtying the memory, and thus program-specific priorities do not apply.
.SH "RETURN VALUE"
On success,
.BR ioprio_get ()
@ -195,7 +189,7 @@ classes and priority levels for
.SH NOTES
These system calls only have an effect when used
in conjunction with an I/O scheduler that supports I/O priorities.
As at kernel 2.6.16 the only such scheduler is the Completely Fair Queuing
As at kernel 2.6.17 the only such scheduler is the Completely Fair Queuing
(CFQ) I/O scheduler.
.SS "Selecting an I/O Scheduler"
I/O Schedulers are selected on a per-device basis via the special
@ -315,6 +309,6 @@ Suitable definitions can be found in
These system calls have been available on Linux since
kernel 2.6.13.
.SH "SEE ALSO"
.BR getpriority "(2), " capabilities (7)
.BR getpriority "(2), " open "(2), " capabilities (7)
.sp
Documentation/block/ioprio.txt in the kernel source tree.