LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
* LTTng 0.52, scheduler instrumentation
@ 2008-11-07  1:08 Mathieu Desnoyers
  0 siblings, 0 replies; only message in thread
From: Mathieu Desnoyers @ 2008-11-07  1:08 UTC (permalink / raw)
  To: ltt-dev; +Cc: linux-kernel, Ingo Molnar, Steven Rostedt, Peter Zijlstra

Hi,

I just released LTTng 0.52 for 2.6.27.4. It fixes the stuff I dreamt
about this morning. ;-)

Ingo what do you think about this first point ?

- I now only use 2 bytes to encode the task->state field in the trace.
  However it seems that 1 byte would be enough (bitmask of values 0 to
  127), except that -1 is used for "unrunnable". But when it's
  unrunnable, it should "never" be reach scheduler events, right ?

Changelog :
- Add kernel command line : force_tsc_sync=1 to force tsc
  synchronization at boot.
- Supports AMD64 X2 box with unsynchronized TSCs very well. Includes
  a warning that tells users to try
  force_tsc_sync=1 idle=poll and to disable PowerNow or Speedstep to get
  synchronized timestamp counters on x86. This workaround works very
  well.
- Default to no LTT alignment for traces if
  HAVE_EFFICIENT_UNALIGNED_ACCESS is selected.
- Fixed mixed up irq entry field names in (appeared in 0.51).

Some testing would be required with virtualization to see how it
behaves.

Mathieu

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

^ permalink raw reply	[flat|nested] only message in thread

only message in thread, other threads:[~2008-11-07  1:08 UTC | newest]

Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2008-11-07  1:08 LTTng 0.52, scheduler instrumentation Mathieu Desnoyers

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).