On Fri, Aug 12, 2011 at 12:21:44PM -0600, Bruce Guenter wrote: > On Thu, Aug 11, 2011 at 05:40:36PM -0700, Simon Kirby wrote: > > By chance, does "vmstat 1" or top show a high system cpu% while this is > > happening, > > Absolutely, usually around 80-90%
...which is perhaps why you had difficult obtaining traces with sysrq-w, since most of the time there were no D-state processes. Instead, sysrq-l give a backtrace of each running CPU. > > and if so, does cat /proc/<pid>/stack of the PIDs in R state > > sometimes show things under btrfs_run_delayed_refs like > > setup_cluster_no_bitmap() and rb_next()? > > No, I am not seeing what you describe. The stack traces are usually > showing what I originally quoted. I don't know if I've seen > setup_cluster_no_bitmap or rb_* at all. Ok, oh well. :) Simon- -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
