* Miklos Szeredi <[email protected]> wrote:
> > it doesnt need it - turn IRQOFF_TRACING off.
>
> # CONFIG_CRITICAL_IRQSOFF_TIMING is not set
>
> This seems to be off.
>
> But latency_trace.c uses irqs_disabled_flags(), which is defined in
> <linux/irqflags.h> only if CONFIG_TRACE_IRQFLAGS_SUPPORT is set.
>
> So perhaps latency_trace.c should be using raw_irqs_disabled_flags()
> instead. But UML doesn't define that either and I have no idea how to
> do that, so this is still not solved yet.
irqs_disabled_flags() gives us a nonessential bit of the trace output:
_------=> CPU#
/ _-----=> irqs-off
| / _----=> need-resched
|| / _---=> hardirq/softirq
||| / _--=> preempt-depth
|||| /
||||| delay
cmd pid ||||| time | caller
\ / ||||| \ | /
privoxy-12926 1.Ns1 0us : ktime_get_ts (ktime_get)
privoxy-12926 1.Ns1 0us : getnstimeofday (ktime_get_ts)
privoxy-12926 1.Ns1 1us : set_normalized_timespec (ktime_get_ts)
privoxy-12926 1.Ns1 1us : rb_first (htb_dequeue)
it's the 'irqs-off' flag, which is 'd', 'D' or '.'.
so you can define irqs_off_flags to always-0 and you should be able to
get pretty good traces still. It should have no functional impact.
Ingo
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
