Re: [PATCH 1/2] tracing: don't busy wait in buffer splice

2014-11-07 Thread Steven Rostedt
On Fri, 7 Nov 2014 13:21:06 -0500 Steven Rostedt wrote: > This also needs to be marked for stable. I'll start looking at how far > this goes back. I'm thinking it may go back as far as the splice code > was created. Actually, it is broken back to 3.16. 3.15 and before was safe because it was st

Re: [PATCH 1/2] tracing: don't busy wait in buffer splice

2014-11-07 Thread Steven Rostedt
On Thu, 6 Nov 2014 22:26:06 +0100 Rabin Vincent wrote: > On a !PREEMPT kernel, attempting to use trace-cmd results in a soft > lockup: > > # trace-cmd record -e raw_syscalls:* -F false > NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [trace-cmd:61] > ... > Call Trace: > [] ? __wake