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<title>change log for rtems (2011-05-18)</title>
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<font color='#bb2222'><strong>joel</strong></font>
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<tr><td colspan='3' bgcolor='#dddddd'><pre>2011-05-18 Joel Sherrill <joel.sherrill@oarcorp.com>
* user/conf.t: Add SMP Configuration parameters.
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<tr><td width='1%'><a href="http://www.rtems.com/cgi-bin/viewcvs.cgi//rtems/doc/ChangeLog.diff?r1=text&tr1=1.308&r2=text&tr2=1.309&diff_format=h">M</a></td><td width='1%'>1.309</td><td width='100%'>doc/ChangeLog</td></tr>
<tr><td width='1%'><a href="http://www.rtems.com/cgi-bin/viewcvs.cgi//rtems/doc/user/conf.t.diff?r1=text&tr1=1.69&r2=text&tr2=1.70&diff_format=h">M</a></td><td width='1%'>1.70</td><td width='100%'>doc/user/conf.t</td></tr>
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<font color='#006600'>diff -u rtems/doc/ChangeLog:1.308 rtems/doc/ChangeLog:1.309
--- rtems/doc/ChangeLog:1.308 Wed May 18 18:00:49 2011
+++ rtems/doc/ChangeLog Wed May 18 18:29:12 2011
</font><font color='#997700'>@@ -1,5 +1,9 @@
</font> 2011-05-18 Joel Sherrill <joel.sherrill@oarcorp.com>
<font color='#000088'>+ * user/conf.t: Add SMP Configuration parameters.
+
+2011-05-18 Joel Sherrill <joel.sherrill@oarcorp.com>
+
</font> * user/conf.t: Slight rework to deemphasize not using confdefs.h
2011-05-12 Joel Sherrill <joel.sherrilL@OARcorp.com>
<font color='#006600'>diff -u rtems/doc/user/conf.t:1.69 rtems/doc/user/conf.t:1.70
--- rtems/doc/user/conf.t:1.69 Wed May 18 18:00:50 2011
+++ rtems/doc/user/conf.t Wed May 18 18:29:12 2011
</font><font color='#997700'>@@ -402,11 +402,12 @@
</font>
@findex CONFIGURE_SCHEDULER_PRIORITY
@item Deterministic Priority Scheduler - This is the default scheduler
<font color='#880000'>-in RTEMS and is designed for predictable performance under the highest
-loads. It can block or unblock a thread in a constant amount of time.
-This scheduler requires a variable amount of memory based upon the number
-of priorities configured in the system. This scheduler may be explicitly
-selected by defining @code{CONFIGURE_SCHEDULER_PRIORITY}.
</font><font color='#000088'>+in RTEMS for single core applications and is designed for predictable
+performance under the highest loads. It can block or unblock a thread
+in a constant amount of time. This scheduler requires a variable
+amount of memory based upon the number of priorities configured in
+the system. This scheduler may be explicitly selected by defining
+@code{CONFIGURE_SCHEDULER_PRIORITY}.
</font>
@findex CONFIGURE_SCHEDULER_SIMPLE
@item Simple Priority Scheduler - This is an alternative scheduler
<font color='#997700'>@@ -418,6 +419,23 @@
</font> for use in small systems where RAM is limited. This scheduler may be explicitly
selected by defining @code{CONFIGURE_SCHEDULER_SIMPLE}.
<font color='#000088'>+@findex CONFIGURE_SCHEDULER_SIMPLE_SMP
+@item Simple SMP Priority Scheduler - This scheduler is derived from the
+Simple Priority Scheduler but is capable of scheduling threads across
+multiple cores. It is designed to provide the same task scheduling
+behaviour as the Deterministic Priority Scheduler while distributing
+threads across multiple cores. Being based upon the Simple Priority
+Scheduler, it is also maintains a single sorted list of all ready threads.
+Thus blocking or unblocking a thread is not a constant time operation
+with this scheduler. In addition, when allocating threads to cores,
+the algorithm is not constant time. This algorithm was not designed
+with efficiency as a primary design goal. Its primary design goal was to
+provide an SMP-aware scheduling algorithm that is simple to understand.
+This scheduler is currently the default in SMP configurations and is
+only selected when @code{CONFIGURE_SMP_APPLICATION} is defined. In a
+configuration with SMP enabled at configure time, it may be explicitly
+selected by defining @code{CONFIGURE_SCHEDULER_SIMPLE_SMP}.
+
</font> @end itemize
The pluggable scheduler interface was added after the 4.10 release series
<font color='#997700'>@@ -453,6 +471,26 @@
</font> @c
@c
@c
<font color='#000088'>+@subsection SMP Specific Configuration Parameters
+
+When RTEMS is configured to support SMP target systems, there are other
+configuration parameters which apply.
+
+@itemize @bullet
+
+@findex CONFIGURE_SMP_APPLICATION
+@item @code{CONFIGURE_SMP_APPLICATION} must be defined if the application
+is to make use of multiple CPU cores in an SMP target system.
+
+@item @code{CONFIGURE_SMP_MAXIMUM_PROCESSORS} must be set to the number
+of CPU cores in the SMP configuration. If there are more cores available
+than configured, the rest will be ignored.
+
+@end itemize
+
+@c
+@c
+@c
</font> @subsection Device Driver Table
This section defines the configuration parameters related
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