* Re: RCU locking issues in jbd2_dev_to_name
[not found] <20110727174104.65fb9c1c@notabene.brown>
@ 2011-07-27 11:28 ` Theodore Tso
2011-07-27 22:45 ` NeilBrown
0 siblings, 1 reply; 2+ messages in thread
From: Theodore Tso @ 2011-07-27 11:28 UTC (permalink / raw)
To: NeilBrown; +Cc: linux-ext4, Paul E.McKenney
On Jul 27, 2011, at 3:41 AM, NeilBrown wrote:
>
>
> Hi Ted and all,
>
> I've been exploring RCU usage in the kernel looking for strange things, and
> jbd2_dev_to_name looks particularly strange. The following patch explains
> and addresses the issues that I found. Comments welcome.
Yeah its broken. But I have patches pending for the merge window that solve
it by nuking the function altogether; the problem is calling a function from
TP_PRINTK causes perf to die on the spot, terminating its tracing. :-(
- Ted
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: RCU locking issues in jbd2_dev_to_name
2011-07-27 11:28 ` RCU locking issues in jbd2_dev_to_name Theodore Tso
@ 2011-07-27 22:45 ` NeilBrown
0 siblings, 0 replies; 2+ messages in thread
From: NeilBrown @ 2011-07-27 22:45 UTC (permalink / raw)
To: Theodore Tso; +Cc: linux-ext4, Paul E.McKenney
On Wed, 27 Jul 2011 07:28:27 -0400 Theodore Tso <tytso@MIT.EDU> wrote:
>
> On Jul 27, 2011, at 3:41 AM, NeilBrown wrote:
>
> >
> >
> > Hi Ted and all,
> >
> > I've been exploring RCU usage in the kernel looking for strange things, and
> > jbd2_dev_to_name looks particularly strange. The following patch explains
> > and addresses the issues that I found. Comments welcome.
>
> Yeah its broken. But I have patches pending for the merge window that solve
> it by nuking the function altogether; the problem is calling a function from
> TP_PRINTK causes perf to die on the spot, terminating its tracing. :-(
>
Sounds painful...
If it is about to go, that is good enough for me.
Thanks,
NeilBrown
^ permalink raw reply [flat|nested] 2+ messages in thread
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2011-07-27 11:28 ` RCU locking issues in jbd2_dev_to_name Theodore Tso
2011-07-27 22:45 ` NeilBrown
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