Re: [PATCH v2 0/8] kernel/fork: Move thread stack free otu of the scheduler path.

[Andy Lutomirski]

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