Hi Gaurav, On Thu, 16 Jan 2014 20:23:27 +0000, Gaurav Jain wrote: > On 1/16/14, 9:37 AM, "Arnaldo Carvalho de Melo" <a...@ghostprotocols.net> > wrote: > >>Em Thu, Jan 16, 2014 at 10:49:31AM +0900, Namhyung Kim escreveu: >>> Gaurav reported that perf cannot profile JIT program if it executes >>> the code on heap. This was because current map__new() only handle JIT >>> on anon mappings - extends it to handle no_dso (heap, stack) case too. >>> >>> This patch assumes JIT profiling only provides dynamic function >>> symbols so check the mapping type to distinguish the case. It'd >>> provide no symbols for data mapping - if we need to support symbols on >>> data mappings later it should be changed. >> >>But we do support symbols in data mappings, that is why we have >>MAP__VARIABLE, etc, can you elaborate? > > Does perf support data mappings from perf map files? Could you please > share an example of how I may be able to use this.
IIUC there's no difference between function and data mapping. So you can use same perf map file for both - in fact there's no way to use different map file in a single task. I guess perf will use it to find only function symbols in function mappings and variables in data mapping based on the address it accesses. What I wasn't sure is whether JIT program also produces some dynamic data. And I think only perf mem command cares about data mappings, no? Thanks, Namhyung -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
