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atexit() functions now called when task killed by task delete; For MCUs with <= 64Kb of SRAM, CONFIG_MM_SMALL can be defined to reduce the memory allocation overhead

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3648 42af7a65-404d-4744-a932-0658087f49c3
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patacongo 2011-05-28 21:42:18 +00:00
parent 012368c484
commit 0e8131d443
1 changed files with 9 additions and 0 deletions
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9
configs/README.txt
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@ -261,6 +261,15 @@ defconfig -- This is a configuration file similar to the Linux
regions of memory to allocate from, this specifies the
number of memory regions that the memory manager must
handle and enables the API mm_addregion(start, end);
CONFIG_MM_SMALL - Each memory allocation has a small allocation
overhead. The size of that overhead is normally determined by
the "width" of the address support by the MCU. MCUs that support
16-bit addressability have smaller overhead than devices that
support 32-bit addressability. However, there are many MCUs
that support 32-bit addressability *but* have internal SRAM
of size less than or equal to 64Kb. In this case, CONFIG_MM_SMALL
can be defined so that those MCUs will also benefit from the
smaller, 16-bit-based allocation overhead.
CONFIG_MSEC_PER_TICK - The default system timer is 100Hz
or MSEC_PER_TICK=10. This setting may be defined to
inform NuttX that the processor hardware is providing