Messages in this thread | | | Date | Tue, 24 Oct 2000 16:21:39 +0200 | From | Andi Kleen <> | Subject | Re: [ANNOUNCE] DProbes 1.1 |
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Hallo,
On Tue, Oct 24, 2000 at 07:37:08PM +0530, bsuparna@in.ibm.com wrote: > For (a), your suggestion of a two pass approach is I guess feasible, but I > wish there were a simpler way to do it. > Actually I don't even really like the idea of forcing the swapped out page > back in, which we are having to do right now - it would have been nicer > if there were a swapin() routine in the vma ops that we could have used for > on-demand probe insertion, just the way we use inode address space > readpage() right now for discardable pages, but maybe that's asking for too > much :-) [Could vma type based swapin() logic be a useful abstraction in > general, aside from dprobes ?].
I think it would be. You could propose it on the linux-mm mailing list and ask Linus what he thinks.
I agree that it would be much nicer to do it this way.
> We don't quite understand (b), though. There is indeed a race due to our > not holding the page given to us by handle_mm_fault, while we try to access > it, and we need to fix that of course, but that doesn't sound exactly like > what you mention here. We do have handle_mm_fault being called under the mm > semaphore. Could you explain the deadlock situation that you have in mind ?
It does not exist sorry. I was misremembering the lock hierarchy at that place when I wrote the mail and should have double checked it.
-Andi
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