Re: [rfc][patch 0/3] a faster buffered write deadlock fix?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Fri, Feb 09, 2007 at 12:41:01AM -0800, Andrew Morton wrote:
> On Thu,  8 Feb 2007 14:07:15 +0100 (CET) Nick Piggin <[email protected]> wrote:
> 
> > So I have finally finished a first slightly-working draft of my new aops
> > op (perform_write) proposal. I would be interested to hear comments about
> > it.  Most of my issues and concerns are in the patch headers themselves,
> > so reply to them.
> > 
> > The patches are against my latest buffered-write-fix patchset.
> 
> What happened with Linus's proposal to instantiate the page as pinned,
> non-uptodate, unlocked and in pagecache while we poke the user address?

That's still got a deadlock, and also it doesn't work if we want to lock
the page when performing a minor fault (which I want to fix fault vs
invalidate), and also assumes nobody's ->nopage locks the page or
requires any resources that are held by prepare_write (something not
immediately clear to me with the cluster filesystems, at least).

But that all becomes legacy path, so do we really care? Supposing fs
maintainers like perform_write, then after the main ones have implementations
we could switch over to the slow-but-correct prepare_write legacy path.
Or we could leave it, or we could use Linus's slightly-less-buggy scheme...
by that point I expect I'd be sick of arguing about it ;)

-
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]
  Powered by Linux