Messages in this thread | | | Date | Tue, 24 Nov 2015 16:34:35 +0900 | From | Namhyung Kim <> | Subject | Re: [RFC/PATCH] perf tools: Introduce perf_thread for backtrace |
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On Mon, Nov 23, 2015 at 06:39:36PM -0300, Arnaldo Carvalho de Melo wrote: > Em Fri, Nov 20, 2015 at 03:03:03PM +0900, Namhyung Kim escreveu: > > Backtrace is a crucial info for debugging. And upcoming refcnt > > tracking facility also wants to use it. > > > > So instead of relying on glibc's backtrace_symbols[_fd] which misses > > some (static) functions , use our own symbol searching mechanism. To > > do that, add perf_thread global variable to keep its maps and symbols. > > > > The backtrace output from TUI is changed like below. (I made a key > > action to generate a segfault for testing): > > This is a really nice use of what we have, I guess we could simplify > things further, not having to create a struct machine, as we have just > one thread, and we're not interested in kernel addresses, so no need for > kmaps, etc.
Yes, I thought about it. But as adding the perf thread to an existing machine can affect other thread(s), I didn't do it. Maybe we can set the perf threads' machine pointer in a hacky way without adding the thread into the machine, but I'd rather not doing that too because it's fragile and current code is simple enough IMHO.
> > But as-is it already looks better than what we were using :-) > > I'll try testing it further and will probably switch to using it if > nobody voices any problem we haven't realised with such approach.
Thank you! Namhyung
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