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author | Dario Faggioli <raistlin@linux.it> | 2013-11-07 14:43:44 +0100 |
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committer | Ingo Molnar <mingo@kernel.org> | 2014-01-13 13:42:56 +0100 |
commit | 2d3d891d3344159d5b452a645e355bbe29591e8b (patch) | |
tree | ab7c4ef00b48d68efa2d57cabf8c3c86160f2406 /kernel/locking/rtmutex_common.h | |
parent | rtmutex: Turn the plist into an rb-tree (diff) | |
download | linux-2d3d891d3344159d5b452a645e355bbe29591e8b.tar.xz linux-2d3d891d3344159d5b452a645e355bbe29591e8b.zip |
sched/deadline: Add SCHED_DEADLINE inheritance logic
Some method to deal with rt-mutexes and make sched_dl interact with
the current PI-coded is needed, raising all but trivial issues, that
needs (according to us) to be solved with some restructuring of
the pi-code (i.e., going toward a proxy execution-ish implementation).
This is under development, in the meanwhile, as a temporary solution,
what this commits does is:
- ensure a pi-lock owner with waiters is never throttled down. Instead,
when it runs out of runtime, it immediately gets replenished and it's
deadline is postponed;
- the scheduling parameters (relative deadline and default runtime)
used for that replenishments --during the whole period it holds the
pi-lock-- are the ones of the waiting task with earliest deadline.
Acting this way, we provide some kind of boosting to the lock-owner,
still by using the existing (actually, slightly modified by the previous
commit) pi-architecture.
We would stress the fact that this is only a surely needed, all but
clean solution to the problem. In the end it's only a way to re-start
discussion within the community. So, as always, comments, ideas, rants,
etc.. are welcome! :-)
Signed-off-by: Dario Faggioli <raistlin@linux.it>
Signed-off-by: Juri Lelli <juri.lelli@gmail.com>
[ Added !RT_MUTEXES build fix. ]
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1383831828-15501-11-git-send-email-juri.lelli@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/locking/rtmutex_common.h')
-rw-r--r-- | kernel/locking/rtmutex_common.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/locking/rtmutex_common.h b/kernel/locking/rtmutex_common.h index b65442fe5ade..7431a9c86f35 100644 --- a/kernel/locking/rtmutex_common.h +++ b/kernel/locking/rtmutex_common.h @@ -54,6 +54,7 @@ struct rt_mutex_waiter { struct pid *deadlock_task_pid; struct rt_mutex *deadlock_lock; #endif + int prio; }; /* |