Em Wed, Mar 24, 2010 at 06:09:30PM +0200, Avi Kivity escreveu: > Doesn't perf already has a dependency on naming conventions for finding > debug information? It looks at several places, from most symbol rich (/usr/lib/debug/, aka -debuginfo packages, where we have full symtabs) to poorest (the packaged binary, where we may just have a .dynsym). In an ideal world, it would just get the build-id (a SHA1 cookie that is in an ELF session inserted in every binary (aka DSOs), kernel module, kallsyms or vmlinux file) and use that to look first in a local cache (implemented in perf for a long time already) or in some symbol server. For instance, for a random perf.data file I collected here in my machine I have: [acme@doppio linux-2.6-tip]$ perf buildid-list | grep libpthread 5c68f7afeb33309c78037e374b0deee84dd441f6 /lib64/libpthread-2.10.2.so [acme@doppio linux-2.6-tip]$ So I don't have to access /lib64/libpthread-2.10.2.so directly, nor some convention to get a debuginfo in a local file like: /usr/lib/debug/lib64/libpthread-2.10.2.so.debug Instead the tools look at: [acme@doppio linux-2.6-tip]$ l ~/.debug/.build-id/5c/68f7afeb33309c78037e374b0deee84dd441f6 lrwxrwxrwx 1 acme acme 73 2010-01-06 18:53 /home/acme/.debug/.build-id/5c/68f7afeb33309c78037e374b0deee84dd441f6 -> ../../lib64/libpthread-2.10.2.so/5c68f7afeb33309c78037e374b0deee84dd441f6* To find the file for that specific build-id, not the one installed in my machine (or on the different machine, of a different architecture) that may be completely unrelated, a new one, or one for a different arch. - Arnaldo -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
