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Since Linux 2.6.25, CAP_SYS_ADMIN is longer required to set 

a low priority (IOPRIO_CLASS_IDLE).
This commit is contained in:
Michael Kerrisk 2008-07-08 10:12:21 +00:00
parent 4aeb366b72
commit d22faa3469
1 changed files with 7 additions and 5 deletions
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12
man2/ioprio_set.2
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@ -22,7 +22,7 @@
.\" with various additions by Michael Kerrisk <mtk.manpages@gmail.com>
.\"
.\"
.TH IOPRIO_SET 2 2007-06-01 "Linux" "Linux Programmer's Manual"
.TH IOPRIO_SET 2 2008-07-09 "Linux" "Linux Programmer's Manual"
.SH NAME
ioprio_get, ioprio_set \- get/set I/O scheduling class and priority
.SH SYNOPSIS
@ -269,8 +269,7 @@ Priority levels range from 0 (highest) to 7 (lowest).
This is the idle scheduling class.
Processes running at this level only get I/O
time when no-one else needs the disk.
The idle class has no class
data.
The idle class has no class data.
Attention is required when assigning this priority class to a process,
since it may become starved if higher priority processes are
constantly accessing the disk.
@ -293,11 +292,14 @@ capability can change the priority of any process.
.B "What is the desired priority"
Attempts to set very high priorities
.RB ( IOPRIO_CLASS_RT )
or very low ones
.RB ( IOPRIO_CLASS_IDLE )
require the
.B CAP_SYS_ADMIN
capability.
Kernel versions up to 2.6.24 also required
.B CAP_SYS_ADMIN
to set a very low priority
.RB ( IOPRIO_CLASS_IDLE ),
but since Linux 2.6.25, this is no longer required.
.PP
A call to
.BR ioprio_set ()