Messages in this thread | | | From | "Stephen C. Tweedie" <> | Date | Mon, 11 Oct 1999 16:43:13 +0100 (BST) | Subject | Re: locking question: do_mmap(), do_munmap() |
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Hi,
On Sun, 10 Oct 1999 19:12:58 +0200 (CEST), Andrea Arcangeli <andrea@suse.de> said:
> The other option is to make the mmap semaphore recursive checking that GFP > is not called in the middle of a vma change. I don't like this one it sound > not robust as the spinlock way to me (see below).
Doesn't work, because you can still have a process which takes one mmap semaphore and then attempts to take a different one inside the swapper as the result of a memory allocation. As soon as you have two processes doing that to each other's semaphores, you still have a deadlock.
--Stephen
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