sched: Move mmdrop to RCU on RT

Browse source

mmdrop() is invoked from finish_task_switch() by the incoming task to drop
the mm which was handed over by the previous task. mmdrop() can be quite
expensive which prevents an incoming real-time task from getting useful
work done.

Provide mmdrop_sched() which maps to mmdrop() on !RT kernels. On RT kernels
it delagates the eventually required invocation of __mmdrop() to RCU.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210928122411.648582026@linutronix.de

...

This commit is contained in:

Thomas Gleixner 2021-09-28 14:24:32 +02:00 • committed by Peter Zijlstra

parent d07b2eee45

commit 8d491de6ed

3 changed files with 34 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

4

include/linux/mm_types.h

View file

29

include/linux/sched/mm.h

View file

2

kernel/sched/core.c

View file