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637b068282
Add {DE,EN}QUEUE_CLASS and fold the sched_class::switch* methods into
the change pattern. This completes and makes the pattern more
symmetric.
This changes the order of callbacks slightly:
OLD NEW
|
| switching_from()
dequeue_task(); | dequeue_task()
put_prev_task(); | put_prev_task()
| switched_from()
|
... change task ... | ... change task ...
|
switching_to(); | switching_to()
enqueue_task(); | enqueue_task()
set_next_task(); | set_next_task()
prev_class->switched_from() |
switched_to() | switched_to()
|
Notably, it moves the switched_from() callback right after the
dequeue/put. Existing implementations don't appear to be affected by
this change in location -- specifically the task isn't enqueued on the
class in question in either location.
Make (CLASS)^(SAVE|MOVE), because there is nothing to save-restore
when changing scheduling classes.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Juri Lelli <juri.lelli@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Vincent Guittot <vincent.guittot@linaro.org>
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.