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SubjectRe: [PATCH 3/6] perf timechart: add support for displaying only tasks related data
> Hmm.. double negation is always confusing to me. :-/  How about making
> it a boolean option that sets "task_only" variable?

> Also need to update the doc. And what if user gives -P and -T options
> at the same time?
Is something like this is enough (or you'd like some printout with error

if (!proc_num && task_only)
usage_with_options(timechart_usage, options);

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