On Sat, Feb 28, 2015 at 2:20 AM, Peter Zijlstra <pet...@infradead.org> wrote:
>>
>> +static u64 bpf_ktime_get_ns(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5)
>> +{
>> + return ktime_get_ns();
>> +}
>
> Please use ktime_get_mono_fast_ns() instead. If you ever want to allow
> running BPF stuff from general tracepoints and the like you need to
> be NMI safe.
good point. will do.
Currently in trace_call_bpf() I have:
if (in_nmi()) /* not supported yet */
return 1;
to tackle nmi after all pieces are in place.
Likely nmi-safe programs will have access to reduced set
of helper functions.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
