kernel symbols lookup is expensive, when we know it's a lookup in module,
we can skip the heavy kernel symbols.
Signed-off-by: Cheng Renquan <crquan@xxxxxxxxx>
---
kernel/kallsyms.c | 12 ++++++++----
1 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 8e5288a..bb9fdc5 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -173,12 +173,16 @@ unsigned long kallsyms_lookup_name(const char *name)
unsigned long i;
unsigned int off;
- for (i = 0, off = 0; i < kallsyms_num_syms; i++) {
- off = kallsyms_expand_symbol(off, namebuf);
+ /* if a colon ':' found, skip the heavy kernel symbols */
+ if (strchr(name, ':') == NULL) {
+ for (i = 0, off = 0; i < kallsyms_num_syms; i++) {
+ off = kallsyms_expand_symbol(off, namebuf);
- if (strcmp(namebuf, name) == 0)
- return kallsyms_addresses[i];
+ if (strcmp(namebuf, name) == 0)
+ return kallsyms_addresses[i];
+ }
}
+
return module_kallsyms_lookup_name(name);
}
EXPORT_SYMBOL_GPL(kallsyms_lookup_name);
--
1.6.5
--
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