Re: locking question: do_mmap(), do_munmap()

Kanoj Sarcar (kanoj@google.engr.sgi.com)
Mon, 11 Oct 1999 12:07:08 -0700 (PDT)

>
> What about something like a rw-semaphore which protects the vma list:
> vma-list modifiers [ie merge_segments(), insert_vm_struct() and
> do_munmap()] grab it exclusive, swapper grabs it "shared, starve
> exclusive".
> All other vma-list readers are protected by mm->mmap_sem.
>
> This should not dead-lock, and no changes are required in
> vm_ops->swapout().
>

I have tried to follow most of the logic and solutions proposed
on this thread. This is the best solution, imo. In fact, I had
already coded something on these lines against a 2.2.10 kernel,
which I still have around. I will try to port this against a
2.3.19 kernel over the next couple of days and post it for
everyone to review.

Thanks.

Kanoj

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