tracing/filter: Optimize filter by folding the tree

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There are many cases that a filter will contain multiple ORs or
ANDs together near the leafs. Walking up and down the tree to get
to the next compare can be a waste.

If there are several ORs or ANDs together, fold them into a single
pred and allocate an array of the conditions that they check.
This will speed up the filter by linearly walking an array
and can still break out if a short circuit condition is met.

Cc: Tom Zanussi <tzanussi@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

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Steven Rostedt 2011-01-27 23:16:51 -05:00 • committed by Steven Rostedt

parent ec126cac23

commit 43cd414552

2 changed files with 235 additions and 10 deletions

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12

kernel/trace/trace.h

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233

kernel/trace/trace_events_filter.c

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