Re: Possible bug report: kernel 6.5.0/6.5.1 high load when CIFS share is mounted (cifsd-cfid-laundromat in"D" state)

[Paul Aurich]

On 2023-09-19 13:23:44 -0500, Steve French wrote:
> On Tue, Sep 19, 2023 at 1:07 PM Tom Talpey <tom@xxxxxxxxxx> wrote:
> > These changes are good, but I'm skeptical they will reduce the load
> > when the laundromat thread is actually running. All these do is avoid
> > creating it when not necessary, right?
>
> It does create half as many laundromat threads (we don't need
> laundromat on connection to IPC$) even for the Windows server target
> example, but helps more for cases where server doesn't support
> directory leases.

Perhaps the laundromat thread should be using msleep_interruptible()?

Using an interruptible sleep appears to prevent the thread from contributing 
to the load average, and has the happy side-effect of removing the up-to-1s delay 
when tearing down the tcon (since a7c01fa93ae, kthread_stop() will return 
early triggered by kthread_stop).

~Paul