Re: [PATCH v3] pipe: use __pipe_{lock,unlock} instead of spinlock

[Matthew Wilcox]

On Mon, Jan 16, 2023 at 11:16:13AM +0800, maobibo wrote:
> Hongchen,
> 
> I have a glance with this patch, it simply replaces with
> spinlock_irqsave with mutex lock. There may be performance
> improvement with two processes competing with pipe, however
> for N processes, there will be complex context switches
> and ipi interruptts.
> 
> Can you find some cases with more than 2 processes competing
> pipe, rather than only unixbench?

What real applications have pipes with more than 1 writer & 1 reader?
I'm OK with slowing down the weird cases if the common cases go faster.