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Date: Thu, 31 Dec 2009 11:10:17 +0800 From: Xiao Guangrong <xiaoguangrong@...fujitsu.com> To: "Dr. David Alan Gilbert" <linux@...blig.org> CC: linux-kernel@...r.kernel.org Subject: Re: perf: confused by cc1 Dr. David Alan Gilbert wrote: > Hi, > I'm running 2.6.33rc2 and thought I'd have a play with perf; its > symbol resolution code seems to be getting itself a bit confused however: > > I recorded a trace of a kernel build like so: > > sudo /discs/more/git/linux-2.6/tools/perf/perf record -a -e cycles -i -g -v -s -d make -j 8 bzImage > > Then I did: > /discs/more/git/linux-2.6/tools/perf/perf report -g > > and the top entry is: > > 69.89% cc1 cc1 [.] 0x000000000337cd > | > |--0.99%-- 0x9f5da8 > | > |--0.74%-- 0x9eec95 > --98.27%-- [...] > > but it's refusing to do symbol look up for cc1 even if I install > the (ubuntu) debug packages (most other files it is doing > symbol resolution on where they have it). I dug a bit further and > it looks like it's not trying to look up the debug packages for cc1 > because it think that mapping is a kernel map. Also for some reason it > thinks the cc1 is an overlapping mapping with the gcc4 binary it's been > executed from: > Your kernel is relocatable? See: http://lkml.org/lkml/2009/12/29/358 Thanks, Xiao -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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