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8 rt_dptbl \- real-time dispatcher parameter table
14 is a set of priority queues on which ready to run processes are linked. These
15 priority queues are mapped by the system configuration into a set of global
18 scheduling priority in the system. The priority queues associated with a given
23 contiguous, depending on the configuration.
26 The real-time class maintains an in-core table, with an entry for each priority
27 level, giving the properties of that level. This table is called the real-time
56 processes at a particular level as the time quantum of a real-time process can
58 system call.
69 An administrator can affect the behavior of the real-time portion of the
71 for doing this: reconfigure with a loadable module at boot-time or by using
72 \fBdispadmin\fR(8) at run-time.
73 .SS "rt_dptbl Loadable Module"
74 The \fBrt_dptbl\fR can be reconfigured with a loadable module which contains a
75 new real time dispatch table. The module containing the dispatch table is
76 separate from the RT loadable module which contains the rest of the real time
83 on a running system using the \fBdispadmin\fR(8) command. Invoking
84 \fBdispadmin\fR for the real-time class allows the administrator to retrieve
85 the current \fBrt_dptbl\fR configuration from the kernel's in-core table, or
86 overwrite the in-core table with values from a configuration file. The
92 is treated as a comment. The first non-blank, non-comment line must indicate
108 up to the next integral multiple of the system clock's resolution.
112 for each of the real-time priority levels. The first line specifies the quantum
113 for real-time level 0, the second line specifies the quantum for real-time
114 level 1. There must be exactly one line for each configured real-time priority
117 -2 indicating an infinite time quantum for that level.
125 priority within the real-time class, and the mapping between these real-time
127 the configuration specified in the \fBRT_DPTBL\fR loadable module. The level
129 and, as with any comment, they are ignored by \fBdispadmin\fR on input.
131 increasing priority level (from 0 to the maximum configured real-time
139 # Real-Time Dispatcher Configuration File
161 \fBExample 2 \fRReplacing The rt_dptbl Loadable Module
165 module which contains the dispatch table information will have to be built. It
166 is recommended that you save the existing module before using the following
182 cc -c -0 -D_KERNEL rt_dptbl.c
183 ld -r -o RT_DPTBL rt_dptbl.o
203 You will have to make changes in the \fB/etc/system\fR file to reflect the
204 changes to the sizes of the tables. See \fBsystem\fR(5). The \fBrt_maxpri\fR
209 set RT:rt_maxpri=(class-specific value for maximum \e
210 real-time priority)
218 Reboot the system to use the new dispatch table.
223 you don't get it right, the system may not behave properly.
241 * This is the loadable module wrapper.
246 * Module linkage information for the kernel.
345 \fISystem Administration Guide: Basic Administration\fR