Changes

weighted tree: Add thresholds to differential palette

This allows to specify a minimum a maximum percentage value between
which there will be a gradation of the colors (negative or positive).
Values below min are considered equal, and above max are shown darkest.

Change-Id: I51a867e7c9ddc68798245855f3056214dfb75f1c
Signed-off-by: Geneviève Bastien <gbastien+lttng@versatic.net>
Reviewed-on: https://git.eclipse.org/r/154442
Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Tested-by: Matthew Khouzam <matthew.khouzam@ericsson.com>

kernel: Aggregate the critical path as a weighted tree

This takes a critical path and flattens it to show the time spent on the
various critical path states and processes

Change-Id: Ie066d026b214d2b3ca8577571afdd621a3cdf6bd
Signed-off-by: Geneviève Bastien <gbastien+lttng@versatic.net>
Reviewed-on: https://git.eclipse.org/r/133090
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Tested-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>