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2023 Sep 11
0
[PATCH V11 04/17] locking/qspinlock: Improve xchg_tail for number of cpus >= 16k
...help the next cmpxchg step, which may
> decrease the cmpxchg retry loops of xchg_tail. Some processors may
> utilize this feature to give a forward guarantee, e.g., RISC-V
> XuanTie processors would block the snoop channel & irq for several
> cycles when prefetch.w instruction (from Zicbop extension) retired,
> which guarantees the next cmpxchg succeeds.
>
> Signed-off-by: Guo Ren <guoren at linux.alibaba.com>
> Signed-off-by: Guo Ren <guoren at kernel.org>
> ---
> kernel/locking/qspinlock.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(...