On 2/17/22 02:23, Sebastian Andrzej Siewior wrote:
This is a follup-up on the patch
sched: Delay task stack freeing on RT
https://lkml.kernel.org/r/20210928122411.593486363@xxxxxxxxxxxxx
It addresses the review feedback:
- Decouple stack accounting from its free invocation. The accounting
happens in do_exit(), the final free call happens later.
- Add put_task_stack_sched() to finish_task_switch(). Here the VMAP
stack is cached only. If it fails, or in the !VMAP case then the final
free happens in delayed_put_task_struct(). This is also an oportunity
to cache the stack.
Changes since v1:
- Drop the bit marked und use addtional RCU head to free the stack in
case that it can't be cached. Suggested by Andy Lutomirski.
Acked-by: Andy Lutomirski <luto@xxxxxxxxxx> This version is much nicer. Thanks! --Andy
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