Re: [PATCH/RFC 12/16] perf tools: Reduce lock contention when processing events

[Jiri Olsa]

On Thu, Dec 10, 2015 at 04:53:31PM +0900, Namhyung Kim wrote:
> When multi-thread is enabled, the machine->threads_lock is contented
> as all worker threads try to grab the writer lock using the
> machine__findnew_thread().  Usually, the thread they're looking for is
> in the tree so they only need the reader lock though.
> 
> Thus try machine__find_thread() first, and then fallback to the
> 'findnew' API.  This will improve the performance.

found one other place, but I guess you chose those
based on profiling the contention?

parent lookup in machine__process_fork_event

jirka
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