Andrew Morton wrote:
They are permanent until someone runs put_page() against all the pages. What I'm saying is that all current callers of get_user_pages() _do_ runput_page() within the same syscall or upon I/O termination.
Oh, okay then. I guess I'll get back to work!Actually, with RDMA, "I/O termination" technically doesn't happen until the memory is deregistered. When the memory is registered, all that means is that it's should be pinned and the virtual-to-physical should be stored. No actual I/O occurs at that point.
If you look at the Infiniband code that was recently submitted, I think you'll see it does exactly that: after calling mlock(), the driver calls get_user_pages(), and it stores the page mappings for future
>
Where?
I was talking about the code that Roland mentioned in the first message of this thread - the user-space verbs support. He said the code calls mlock() and get_user_pages().
FYI, our driver detects the process termination and cleans up everything itself. -- Timur Tabi Staff Software Engineer [email protected] One thing a Southern boy will never say is, "I don't think duct tape will fix it." -- Ed Smylie, NASA engineer for Apollo 13 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
- Follow-Ups:
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Andrew Morton <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- References:
- [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Roland Dreier <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Troy Benjegerdes <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Roland Dreier <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Troy Benjegerdes <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Roland Dreier <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Troy Benjegerdes <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Roland Dreier <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Andrew Morton <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Timur Tabi <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Christoph Hellwig <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Timur Tabi <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Andrew Morton <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Roland Dreier <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Andrew Morton <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Roland Dreier <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Andrew Morton <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Timur Tabi <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Andrew Morton <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Timur Tabi <[email protected]>
- Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- From: Andrew Morton <[email protected]>
- [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- Prev by Date: Re: [openib-general] Re: [PATCH][RFC][0/4] InfiniBand userspace verbsimplementation
- Next by Date: Re: [openib-general] Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- Previous by thread: Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- Next by thread: Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation
- Index(es):