Re: [RFC] parallel directory operations

From: Nikita Danilov (Nikita@Namesys.COM)
Date: Tue Jul 08 2003 - 08:29:33 EST writes:
> >>>>> Nikita Danilov (ND) writes:
> ND> By taking this approach one step further you may just add a semaphore
> ND> into struct dentry and take it instead of directory ->i_sem. I think
> ND> Alexander Viro tried something similar in the past, but it slowed down
> ND> common case when there is no concurrent access to the directory.
> it's not semaphore. locks are created on demand to protect part of directory.
> we can't have a lots of semaphores allocated statically for each part of
> each directory.
> BTW, all of this have to be enabled by 'pdirops' ext3's mount option. so, things
> don't slow down w/o this option.

I am talking about "dynamic locks" taken in fs/namei.c. Have you
measured how your patch affects single-threaded case?


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