On Sat, Dec 12, 2009 at 07:22:03AM +0000, tip-bot for Arnaldo Carvalho de Melo wrote:
> Commit-ID: 79406cd789f745ac6aa9d597895f904a98a14007
> Gitweb: http://git.kernel.org/tip/79406cd789f745ac6aa9d597895f904a98a14007
> Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
> AuthorDate: Fri, 11 Dec 2009 18:50:22 -0200
> Committer: Ingo Molnar <mingo@xxxxxxx>
> CommitDate: Sat, 12 Dec 2009 07:42:11 +0100
>
> perf symbols: Allow lookups by symbol name too
>
> Configurable via symbol_conf.sort_by_name, so that the cost of an
> extra rb_node on all 'struct symbol' instances is not paid by tools
> that only want to decode addresses.
>
> How to use it:
>
> symbol_conf.sort_by_name = true;
> symbol_init(&symbol_conf);
>
> struct map *map = map_groups__find_by_name(kmaps, MAP__VARIABLE, "[kernel.kallsyms]");
>
> if (map == NULL) {
> pr_err("couldn't find map!\n");
> kernel_maps__fprintf(stdout);
> } else {
> struct symbol *sym = map__find_symbol_by_name(map, sym_filter, NULL);
> if (sym == NULL)
> pr_err("couldn't find symbol %s!\n", sym_filter);
> else
> pr_info("symbol %s: %#Lx-%#Lx \n", sym_filter, sym->start, sym->end);
> }
>
> Looking over the vmlinux/kallsyms is common enough that I'll add a
> variable to the upcoming struct perf_session to avoid the need to
> use map_groups__find_by_name to get the main vmlinux/kallsyms map.
>
> The above example looks on the 'variable' symtab, but it is just
> like that for the functions one.
>
> Also the sort operation is done when we first use
> map__find_symbol_by_name, in a lazy way.
It would be nice to also have a kernel symbol resolution
helper independant of any session.
The problem is that I need to resolve a kernel variable symbol
very early, when we parse record options. We don't have any
session at this time so I can't retrieve the kmaps.
I'm not sure what's the proper way to handle that.
Thanks.
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