linux-kernel - Re: [PATCH v3 1/3] lockdep: Make LOCKDEP_CROSSRELEASE configs all part of PROVE

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Date:   Tue, 22 Aug 2017 11:37:03 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Byungchul Park <byungchul.park@....com>
Cc:     Dave Chinner <david@...morbit.com>, mingo@...nel.org,
        linux-kernel@...r.kernel.org, kernel-team@....com,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Tejun Heo <tj@...nel.org>, Boqun Feng <boqun.feng@...il.com>
Subject: Re: [PATCH v3 1/3] lockdep: Make LOCKDEP_CROSSRELEASE configs all
 part of PROVE_LOCKING

On Tue, Aug 22, 2017 at 06:22:36PM +0900, Byungchul Park wrote:
> On Tue, Aug 22, 2017 at 11:06:03AM +0200, Peter Zijlstra wrote:
> > So I did the below little hack, which basically wipes the entire lock
> > history when we start a work and thereby disregards/looses the
> > dependency on the work 'lock'.
> > 
> > It makes my test box able to boot and build a kernel on XFS, so while I
> > see what you're saying (I think), it doesn't appear to instantly show.
> > 
> > Should I run xfstests or something to further verify things are OK? Does
> > that need a scratch partition (I keep forgetting how to run that stuff
> > :/).
> > 
> > ---
> > diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
> > index 66011c9f5df3..de91cdce9460 100644
> > --- a/kernel/locking/lockdep.c
> > +++ b/kernel/locking/lockdep.c
> > @@ -4756,10 +4756,14 @@ void crossrelease_hist_start(enum xhlock_context_t c)
> >  {
> >  	struct task_struct *cur = current;
> >  
> > -	if (cur->xhlocks) {
> > -		cur->xhlock_idx_hist[c] = cur->xhlock_idx;
> > -		cur->hist_id_save[c] = cur->hist_id;
> > -	}
> > +	if (!cur->xhlocks)
> > +		return;
> > +
> > +	if (c == XHLOCK_PROC)
> > +		invalidate_xhlock(&xhlock(cur->xhlock_idx));
> 
> We have to detect dependecies if it exists, even in the following case:
> 
> oooooooiiiiiiiiiiiiiiiiiii.........
>   |<- range for commit ->|
> 
>   where
>   o: acquisition outside of each work,
>   i: acquisition inside of each work,
> 
> With yours, we can never detect dependecies wrt 'o'.

There really shouldn't be any o's when you call
crossrelease_hist_start(XHLOCK_PROC), it should denote the bottom of a
context, see:

  https://lkml.kernel.org/r/20170301104328.GD6515@twins.programming.kicks-ass.net

And in that respect you placed the calls wrongly in process_one_work(),
except it now works out nicely to disregard these fake locks.