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libblock: Add read-ahead task

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Read-ahead requests were previously executed in the context of the
reading task.  This blocks the reading task until the complete read
with read-ahead transfer is finished.  A read-ahead task is introduced
to off-load the read-ahead transfer.  This allows the reading task to
work with the requested block more quickly.  The read-ahead is triggered
after two misses of ascending consecutive blocks or a read hit of a
block read by the most-recent read-ahead transfer.  The read-ahead
feature is configurable and can be disabled.
This commit is contained in:
Sebastian Huber
2012-05-31 10:27:29 +02:00
parent 6273201b14
commit 39ee704e75
11 changed files with 568 additions and 130 deletions
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testsuites/libtests/configure.ac
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@@ -41,6 +41,7 @@ AM_CONDITIONAL(NETTESTS,test "$rtems_cv_RTEMS_NETWORKING" = "yes")
# Explicitly list all Makefiles here
AC_CONFIG_FILES([Makefile
block13/Makefile
rbheap01/Makefile
syscall01/Makefile
flashdisk01/Makefile