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authorArnaldo Carvalho de Melo <acme@redhat.com>2009-12-11 18:50:22 -0200
committerIngo Molnar <mingo@elte.hu>2009-12-12 07:42:11 +0100
commit79406cd789f745ac6aa9d597895f904a98a14007 (patch)
tree99281664ea6e0fd5bd0a6f762feed4f716b356cd /tools/perf/util/thread.h
parent22ccec57f8732de22fd87bce43e8edcb71453c72 (diff)
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. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Masami Hiramatsu <mhiramat@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1260564622-12392-1-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/util/thread.h')
-rw-r--r--tools/perf/util/thread.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index a6333f3716a..1751802a09b 100644
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -64,4 +64,7 @@ map_groups__find_function(struct map_groups *self, u64 addr,
{
return map_groups__find_symbol(self, MAP__FUNCTION, addr, filter);
}
+
+struct map *map_groups__find_by_name(struct map_groups *self,
+ enum map_type type, const char *name);
#endif /* __PERF_THREAD_H */