Messages in this thread | | | From | Nikita Danilov <> | Date | Tue, 8 Jul 2003 17:29:33 +0400 | Subject | Re: [RFC] parallel directory operations |
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bzzz@tmi.comex.ru 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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