X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=ltt%2Fbranches%2Fpoly%2FQUICKSTART;h=434b22c85e58844bd769d8b91018618320986baa;hb=a970363f31999693ffbc0d7d6cf8a15d03677d64;hp=f3501ac05d4312fba32672c910e65c03409b63db;hpb=d0acb5aee20650768f0981f786a98cb0cb242597;p=lttv.git diff --git a/ltt/branches/poly/QUICKSTART b/ltt/branches/poly/QUICKSTART index f3501ac0..434b22c8 100644 --- a/ltt/branches/poly/QUICKSTART +++ b/ltt/branches/poly/QUICKSTART @@ -419,7 +419,7 @@ of the events to the clipboard and paste them in the GUI by clicking on the bottom right label "Current time". Support for this type of filtering should be added to the filter module soon. -* Flight recorder mode +* Hybrid mode Starting from LTTng 0.5.105 and ltt-control 0.20, a new mode can be used : hybrid. It can be especially useful when studying big workloads on a long period @@ -444,6 +444,21 @@ instance, thread branding events are actually considered a "high rate" event when it should be considered "medium rate". The same should apply for the state dump process enumeration. +* Flight recorder mode + +The flight recorder mode writes data into overwritten buffers for all channels, +including control channels, except for the facilities tracefiles. + +The following lttctl commands take a flight recorder trace : + +lttctl -n trace -c -m flight +lttd -n -d -t /tmp/trace -c /sys/kernel/debug/ltt +lttctl -n trace -s +.. do stuff +lttctl -n trace -q +lttd -f -d -t /tmp/trace -c /sys/kernel/debug/ltt +lttctl -m trace -r + *********************************************************** ** Section 4 * Adding new instrumentations with genevent **