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Date: Sun, 15 Apr 2018 01:51:07 +0100
From: Al Viro <viro@ZenIV.linux.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nikolay Borisov <nborisov@suse.com>,
        Andrew Morton <akpm@linux-foundation.org>,
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        Goldwyn Rodrigues <rgoldwyn@suse.de>, Jeff Mahoney <jeffm@suse.com>,
        Davidlohr Bueso <dave@stgolabs.net>
Subject: Re: [PATCH] fs/dcache.c: re-add cond_resched() in
 shrink_dcache_parent()
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On Sat, Apr 14, 2018 at 02:47:21PM -0700, Linus Torvalds wrote:
> On Sat, Apr 14, 2018 at 1:58 PM, Al Viro <viro@zeniv.linux.org.uk> wrote:
> >
> > That breaks d_invalidate(), unfortunately.  Look at the termination
> > conditions in the loop there...
> 
> Ugh. I was going to say "but that doesn't even use select_collect()",
> but yeah, detach_and_collect() calls it.
> 
> It would be easy enough to just change the
> 
>                 if (!list_empty(&data.select.dispose))
> 
> there to
> 
>                 if (!list_empty(&data.select.found))
> 
> too.

You would have to do the same in check_and_drop() as well,
and that brings back d_invalidate()/d_invalidate() livelock
we used to have.  See 81be24d263db...

I'm trying to put something together, but the damn thing is
full of potential livelocks, unfortunately ;-/  Will send
a followup once I have something resembling a sane solution...