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Document on-demand paging configuration settings

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2858 42af7a65-404d-4744-a932-0658087f49c3
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patacongo 2010-08-15 21:50:50 +00:00
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configs/README.txt
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@ -262,6 +262,31 @@ defconfig -- This is a configuration file similar to the Linux
CONFIG_SIG_SIGWORK - The signal number that will be used to wake-up CONFIG_SIG_SIGWORK - The signal number that will be used to wake-up
the worker thread. Default: 4 the worker thread. Default: 4
OS setup related to on-demand paging:
CONFIG_PAGING - If set =y in your configation file, this setting will
enable the on-demand paging feature as described in
http://www.nuttx.org/NuttXDemandPaging.html.
If CONFIG_PAGING is selected, then the following also apply:
CONFIG_PAGING_DEFPRIO - The default, minimum priority of the page fill
worker thread. The priority of the page fill work thread will be boosted
boosted dynmically so that it matches the priority of the task on behalf
of which it peforms the fill. This defines the minimum priority that
will be used. Default: 50.
CONFIG_PAGING_STACKSIZE - Defines the size of the allocated stack
for the page fill worker thread. Default: 1024.
CONFIG_PAGING_BLOCKINGFILL - The architecture specific up_fillpage()
function may be blocking or non-blocking. If defined, this setting
indicates that the up_fillpage() implementation will block until the
transfer is completed. Default: Undefined (non-blocking).
CONFIG_PAGING_TIMEOUT_TICKS - If defined, the implementation will monitor
the (asynchronous) page fill logic. If the fill takes longer than this
number if microseconds, then a fatal error will be declared.
Default: No timeouts monitored.
The following can be used to disable categories of APIs supported The following can be used to disable categories of APIs supported
by the OS. If the compiler supports weak functions, then it by the OS. If the compiler supports weak functions, then it
should not be necessary to disable functions unless you want to should not be necessary to disable functions unless you want to