[PATCH] Optimize wait_sb_inodes()

[OGAWA Hirofumi]

Dave Chinner <david at fromorbit.com> writes:

>> > A performance regression using fsstress?  That's not a program
>> > intended to be a useful benchmark for measuring performance.
>> 
>> Right. fsstress is used as stress tool for me too as part of CI, with
>> background vmstat 1. Anyway, it is why I noticed this.
>> 
>> I agree it would not be high priority. But I don't think we should stop
>> to optimize it.
>
> But you're not proposing any sort of optimisation at all - you're
> simply proposing to hack around the problem so you don't have to
> care about it. The VFS is a shared resource - it has to work well
> for everyone - and that means we need to fix problems and not ignore
> them.

Agree, vfs has to work well for everyone. To work well, vfs should not
force unnecessary overhead/wait.

I'm not saying to stop optimizing wait_sb_inodes() itself, I'm saying it
is not enough.

Thanks.
-- 
OGAWA Hirofumi <hirofumi at mail.parknet.co.jp>