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author | Tejun Heo <tj@kernel.org> | 2010-05-06 18:49:20 +0200 |
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committer | Tejun Heo <tj@kernel.org> | 2010-05-06 18:49:20 +0200 |
commit | 1142d810298e694754498dbb4983fcb6cb7fd884 (patch) | |
tree | 8c5d23b76f129e23d9d967182aa434795e44af5c /arch/s390/kernel | |
parent | 99bd5e2f245d8cd17d040c82d40becdb3efd9b69 (diff) | |
download | op-kernel-dev-1142d810298e694754498dbb4983fcb6cb7fd884.zip op-kernel-dev-1142d810298e694754498dbb4983fcb6cb7fd884.tar.gz |
cpu_stop: implement stop_cpu[s]()
Implement a simplistic per-cpu maximum priority cpu monopolization
mechanism. A non-sleeping callback can be scheduled to run on one or
multiple cpus with maximum priority monopolozing those cpus. This is
primarily to replace and unify RT workqueue usage in stop_machine and
scheduler migration_thread which currently is serving multiple
purposes.
Four functions are provided - stop_one_cpu(), stop_one_cpu_nowait(),
stop_cpus() and try_stop_cpus().
This is to allow clean sharing of resources among stop_cpu and all the
migration thread users. One stopper thread per cpu is created which
is currently named "stopper/CPU". This will eventually replace the
migration thread and take on its name.
* This facility was originally named cpuhog and lived in separate
files but Peter Zijlstra nacked the name and thus got renamed to
cpu_stop and moved into stop_machine.c.
* Better reporting of preemption leak as per Peter's suggestion.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Dimitri Sivanich <sivanich@sgi.com>
Diffstat (limited to 'arch/s390/kernel')
0 files changed, 0 insertions, 0 deletions