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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2012-05-09 14:33:51 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2012-05-11 13:58:43 +0200 |
| commit | 86ef0df976faf1b060347a07744814458aa42619 (patch) | |
| tree | d001b836005d059b5aa11cf541093f5027c50d28 /testsuites/fstests/fsdosfssync01/fsdosfssync01.doc | |
| parent | libblock: Add RTEMS_BLKIO_PURGEDEV (diff) | |
| download | rtems-86ef0df976faf1b060347a07744814458aa42619.tar.bz2 | |
dosfs: Remove fat_file_datasync()
The fat_file_datasync() read every cluster of the file into the cache
and then synchronized it step-by-step. For unmodified buffers this is a
non-operation. For modified buffers this will wake-up the swapout task
which performs then a single buffer write operation. This is usually
quite inefficient. Firstly we do single buffer writes, secondly we
may perform a lot of unnecessary read operations (for huge files this is
really bad), and thirdly this leads likely to cache evictions.
The synchronization procedure is replaced by a simple
rtems_bdbuf_sync_dev(). This has the side-effect that also buffers not
related to the file are synchronized, but since the modified list is
normally short this should be acceptable.
Diffstat (limited to 'testsuites/fstests/fsdosfssync01/fsdosfssync01.doc')
| -rw-r--r-- | testsuites/fstests/fsdosfssync01/fsdosfssync01.doc | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/testsuites/fstests/fsdosfssync01/fsdosfssync01.doc b/testsuites/fstests/fsdosfssync01/fsdosfssync01.doc new file mode 100644 index 0000000000..98b558a4f5 --- /dev/null +++ b/testsuites/fstests/fsdosfssync01/fsdosfssync01.doc @@ -0,0 +1,11 @@ +This file describes the directives and concepts tested by this test set. + +test set name: fsdosfssync01 + +directives: + + TBD + +concepts: + + TBD |