Hi,
I have, since a few weeks, moved LTTng to the markers infrastructure. I
left the ltt-dev users and contributors test the markers and LTTng on various
architectures (i386, x86_64, PowerPC, -ppc, ARM, MIPS) before posting it on
LKML.
The most important new features since the my post :
- Use DebugFS
- Use the "Markers" infrastructure (updated since the last post on LKML).
- Dynamically loadable "probes" that connects to the markers.
- CPU Hotplug support (this piece seemed necessary for the Xen port I am
currently working on)
- Use of per-CPU atomic operations even on SMP machines (no lock prefix, no
memory barriers) to update the per-cpu counters. An explicit smp_wmb()
is used at the one place where the subbuffers are tagged "full" and
smp_rmb() is used in the buffer consumer just after it reads this counter
indicating that the subbuffer is full.
I am not submitting the probes themselves, as they can be provided as separate
kernel modules.
Comments and constructive criticism are, as always, welcome.
The patches follow.
Mathieu
OpenPGP public key: http://krystal.dyndns.org:8080/key/compudj.gpg
Key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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