> On Sat, 9 Feb 2002, Benjamin LaHaise wrote:
> > On Fri, Feb 08, 2002 at 05:46:56PM +0000, Hugh Dickins wrote:
> > > Ben, you probably have an AIO opinion here. Is there a circumstance
> > > in which AIO can unpin a user page at interrupt time, after the
> > > calling task has (exited or) unmapped the page?
> > If the user unmaps the page, then aio is left holding the last reference
> > to the page and will unmap it from irq or bh context (potentially task
> > context too). With networked aio, pages from userspace (anonymous or
> > page cache pages) will be released by the network stack from bh context.
> > Even now, I'm guess that should be possible with the zero copy flag...
Hugh. Are you sure we can free a page from IRQ/BH context with _current_
Please make sure so.
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