Hey all, would it be possible to add a feature to perf to only grab callgraphs for a certain selection of events? E.g. thinking about a lock contention profile of a Qt application, I'd listen to
-e syscalls:sys_enter_futex,syscalls:sys_exit_futex Now, with the dwarf unwinder this easily produces huge data files in the order of gigabytes. This cost could easily be reduced by a factor of two, as one only needs the callgraphs for syscalls:sys_enter_futex - the TID should be enough to find the callgraph for the enter event from the exit trace point. Could someone guide me in implementing such a feature to make it possible to filter the events which trigger the collection of a callgraph? Or is that already possible somehow? Thanks -- Milian Wolff | [email protected] | Software Engineer KDAB (Deutschland) GmbH&Co KG, a KDAB Group company Tel: +49-30-521325470 KDAB - The Qt Experts
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