* Dave Hansen <dave@xxxxxxxx> wrote: > On 07/22/2013 03:06 AM, Ingo Molnar wrote: > > Btw., would be nice to also integrate these VM counters into perf as well, > > as an instrumentation variant/option. > > > > It could be done in an almost zero overhead fashion using jump-labels I > > think. > > > > [ Just in case someone is bored to death and is looking for an interesting > > side project ;-) ] > > I'd actually been thinking about making them in to tracepoints, but the > tracepoint macros seem to create #include messes if you try to use them > in very common headers. > > Agree it would be an interesting side project, though. :) Yes, tracepoints was what I was thinking about, it would allow easy integration into perf [and it's useful even without any userspace side] - as long as: - the tracepoints trace the counts/sums, not just the events themselves - when the tracepoints are not active the VM counts are still maintained separately I.e. the existing VM counts and its extraction facilities are not impacted in any way, just a new channel of instrumentation is provided - jump-label/static-key optimized by virtue of being tracepoints. Thanks, Ingo -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>