Timur> Hi, Is it possible for a page of memory that's been
Timur> "grabbed" with get_user_pages() to ever be allocated to
Timur> another process? I'm assuming the answer is no, but I have
Timur> a specific case I want to ask about.
Not to the best of my knowledge, although you should probably read the
code to convince yourself.
Timur> Until 2.6.7, there was a bug in the VM where a page that
Timur> was grabbed with get_user_pages() could be swapped out.
Timur> Those of you familar with the OpenIB work know what I'm
Timur> talking about. Would that bug affect anything I'm talking
Timur> about?
This isn't what the bug caused. What could happen was that the
swapper could unmap a page from a process's virtual memory map before
it noticed that the page had an elevated reference count. The page
wouldn't get swapped out, but when the process caused a page fault to
bring the virtual address back, it would get a different piece of
physical memory.
- R.
-
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/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
