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goren
2023 Sep 11
0
[PATCH V11 04/17] locking/qspinlock: Improve xchg_tail for number of cpus >= 16k
On 9/10/23 04:28, guoren at kernel.org wrote:
> From: Guo Ren <guoren at linux.alibaba.com>
>
> The target of xchg_tail is to write the tail to the lock value, so
> adding prefetchw could help the next cmpxchg step, which may
> decrease the cmpxchg retry loops of xchg_tail. Some processors may
> uti...