Messages in this thread | | | Date | Tue, 16 Mar 2010 10:46:11 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH 2/2] perf top: Properly notify the user that vmlinux is missing |
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* David Miller <davem@davemloft.net> wrote:
> From: Arnaldo Carvalho de Melo <acme@infradead.org> > Date: Mon, 15 Mar 2010 16:21:26 -0300 > > > Em Mon, Mar 15, 2010 at 11:55:26AM -0700, David Miller escreveu: > >> Arnaldo, if perf top can use the kallsyms to do it's normal task, why > >> can't it use that for symbol annotations too? Isn't there enough > >> information available? > > > > Annotation is done by objdump -dS, that requires an executable file to do > > ASM annotation, and one with DWARF info for source code annotation. What > > we have with /proc/kallsyms is just the symtab. > > Ok, I really think we should link with libopcodes or similar so we can > handle the simple assembler annotation case without requiring the kernel > image being available. > > That's what I was trying to achieve when I sent you the report > :-)
i'd really like that to happen - i.e. if we had the kernel (and modules) image exposed as a (almost-)standard ELF object via /sys or so.
We already have some aspects of that, via /sys/kernel/notes, but it should be done for real. That would also make build-id support less of a hack.
( I'd not include CFI debuginfo in there though - that would be way too large. More compressed debuginfo could be included perhaps. )
Ingo
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