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| author | Frank Haverkamp <haver@linux.vnet.ibm.com> | 2014-09-10 16:37:53 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-24 08:15:47 +0200 |
| commit | 1451f414639465995dfc1f820aa1a64723cbd662 (patch) | |
| tree | d1983ab9e5d532368ad82261295a78c114fa8514 /Documentation/scheduler/sched-rt-group.txt | |
| parent | GenWQE: Fix problem when reading HSI and Retc (diff) | |
| download | linux-1451f414639465995dfc1f820aa1a64723cbd662.tar.xz linux-1451f414639465995dfc1f820aa1a64723cbd662.zip | |
GenWQE: Support blocking when DDCB queue is busy
When the GenWQE hardware queue was busy, the driver returned simply
-EBUSY. This caused polling by applications which increased the load
on the already busy system. This change implements the possiblity to
sleep on a waitqueue instead when the DDCB queue is busy. The
requestor is woken up when there is free space on the queue again.
The old way to get -EBUSY is still available if the device is openend
with O_NONBLOCKING. The default is now blocking behavior.
Signed-off-by: Frank Haverkamp <haver@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/scheduler/sched-rt-group.txt')
0 files changed, 0 insertions, 0 deletions