* 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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