change log for rtems (2011-05-18)

[Gedare Bloom]

+Scheduler, it is also maintains a single sorted list of all ready threads.

s/it is also/it also


On Wed, May 18, 2011 at 8:10 PM, rtems-vc at rtems.org <rtems-vc at rtems.org>wrote:

>   *joel*
>
> 2011-05-18	Joel Sherrill <joel.sherrill at oarcorp.com
> >
>
> 	* user/conf.t: Add SMP Configuration parameters.
>
> M<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>
> 1.309doc/ChangeLog M<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>
> 1.70doc/user/conf.t
>
> 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@@ -1,5 +1,9 @@
>  2011-05-18	Joel Sherrill <joel.sherrill at oarcorp.com>
>
> +	* user/conf.t: Add SMP Configuration parameters.
> +
> +2011-05-18	Joel Sherrill <joel.sherrill at oarcorp.com>
> +
>  	* user/conf.t: Slight rework to deemphasize not using confdefs.h
>
>  2011-05-12	Joel Sherrill <joel.sherrilL at OARcorp.com>
>
> 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@@ -402,11 +402,12 @@
>  @findex CONFIGURE_SCHEDULER_PRIORITY
>  @item Deterministic Priority Scheduler - This is the default scheduler-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}.+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
> + at code{CONFIGURE_SCHEDULER_PRIORITY}.
>  @findex CONFIGURE_SCHEDULER_SIMPLE
>  @item Simple Priority Scheduler - This is an alternative scheduler@@ -418,6 +419,23 @@ for use in small systems where RAM is limited.  This scheduler may be explicitly
>  selected by defining @code{CONFIGURE_SCHEDULER_SIMPLE}.
>  + at findex CONFIGURE_SCHEDULER_SIMPLE_SMP
> + at 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}.
> + @end itemize
>
>  The pluggable scheduler interface was added after the 4.10 release series@@ -453,6 +471,26 @@ @c
>  @c
>  @c+ at subsection SMP Specific Configuration Parameters
> +
> +When RTEMS is configured to support SMP target systems, there are other
> +configuration parameters which apply.
> +
> + at itemize @bullet
> +
> + at findex CONFIGURE_SMP_APPLICATION
> + at item @code{CONFIGURE_SMP_APPLICATION} must be defined if the application
> +is to make use of multiple CPU cores in an SMP target system.
> +
> + at 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.
> +
> + at end itemize
> +
> + at c
> + at c
> + at c @subsection Device Driver Table
>
>  This section defines the configuration parameters related
>
>
>
> --
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