On 06/06/2016 11:22 PM, valdis.kletni...@vt.edu wrote:
On Mon, 06 Jun 2016 14:20:32 -0700, Linus Torvalds said:
I guess some "concurrent readdir with unlink" load would show that
behavior, but is it _realistic_? No idea. Let's not worry about it too
much until somebody shows a reason to worry.
I've seen Makefiles where 'make clean' does a 'find . -name "*.o" | xargs rm'.
But if somebody is doing that often enough against cache-cold directory trees
to matter, they have bigger problems (like learning how to properly develop
code using 'make'). So unless performance is *so* bad it triggers the lockup
detector, it's probably OK....
The performance won't be very bad. It is just that with the right mix of
readers and writers, the performance can be a bit worse with i_rwsem
than with i_mutex. But in other cases, the performance will be
comparable or better with i_rwsem.
Regards,
Longman
