Re: hangs on boot in 9984d7394618df9

[Nathan Zimmer]

On 04/08/2013 06:46 PM, Doug Anderson wrote:
> Al,
>
> On Mon, Apr 8, 2013 at 4:06 PM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
> > Folks, see if vfs.git#experimental works for you; the PITA had apparently
> > been caused by change of open() semantics for /proc/<pid>/fd/<some_pipe> -
> > it started to behave like a FIFO, i.e. wait for peer to show up.  Normally
> > that's not a problem, but if you have closed e.g. the write end of a pipe
> > and try to open /proc/<pid>/fd/<read_end_of_pipe>, you'll get open() waiting
> > for writers to appear.  Which isn't what we used to do here (open succeeded
> > immediately) and apparently that was enough to trip drakut.
> >
> > Branch head should be at 574179469f7370aadb9cbac1ceca7c3723c17bee.
> That branch booted fine for me and didn't show any problems.
>
> I wasn't easily able to merge onto linux-next and test there though.
> I tried applying these the 4 top commits of your branch to
> "next-20130408" and it didn't solve my problems.  A full merge of your
> branch to linux-next showed conflicts and I didn't dig.
>
> -Doug
I booted great for me too.
Also the numbers from the scaling test are improved also, at least on my 
128p box.
I'll verify on a 512 or larger box when I have the chance.
However I think I still should to provide some relief for the older kernels.
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