Messages in this thread | | | Date | Wed, 10 Jul 2002 09:46:45 -0700 | From | William Lee Irwin III <> | Subject | Re: BKL removal |
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On Wed, Jul 10, 2002 at 12:03:08PM +0200, Marco Colombo wrote: >> Larry, there's something I've always wanted to ask you about your >> idea of the "locking cliff": when you're counting the number of locks, >> are you looking at the running image of an OS or at the source?
On Wed, Jul 10, 2002 at 03:40:03PM +0100, Matthew Wilcox wrote: > Larry normally talks about the number of conceptual locks. So in order > to manipulate a `struct file', it really doesn't matter whether you have > to grab the BKL, the files_struct lock or the filp->lock. There's a big > difference if you have to grab the filp->pos_lock, the filp->ra_lock and > the filp->iobuf_lock. You'd have to know what order to grab them in, > for a start.
This is called "lock depth" and is not related to the total number of locks declared in the source. AFAIK no one wants to increase lock depth.
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