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[v6,09/11] livepatch: Improve the search performance of module_kallsyms_on_each_symbol()

Message ID 20220924122051.362-10-thunder.leizhen@huawei.com (mailing list archive)
State New, archived
Headers show
Series kallsyms: Optimizes the performance of lookup symbols | expand

Commit Message

Leizhen (ThunderTown) Sept. 24, 2022, 12:20 p.m. UTC 
Currently we traverse all symbols of all modules to find the specified
function for the specified module. But in reality, we just need to find
the given module and then traverse all the symbols in it.

Let's add a new parameter 'const char *modname' to function
module_kallsyms_on_each_symbol(), then we can compare the module names
directly in this function and call hook 'fn' after matching. And the
parameter 'struct module *' in the hook 'fn' can also be deleted.

Phase1: mod1-->mod2..(subsequent modules do not need to be compared)
                |
Phase2:          -->f1-->f2-->f3

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
---
 include/linux/module.h   |  4 ++--
 kernel/livepatch/core.c  | 13 ++-----------
 kernel/module/kallsyms.c | 15 ++++++++++++---
 3 files changed, 16 insertions(+), 16 deletions(-)
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Patch

diff --git a/include/linux/module.h b/include/linux/module.h
index 518296ea7f73af6..6e1a531d78e7e8b 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -879,8 +879,8 @@  static inline bool module_sig_ok(struct module *module)
 }
 #endif	/* CONFIG_MODULE_SIG */
 
-int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
-					     struct module *, unsigned long),
+int module_kallsyms_on_each_symbol(const char *modname,
+				   int (*fn)(void *, const char *, unsigned long),
 				   void *data);
 
 #endif /* _LINUX_MODULE_H */
diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index 31b57ccf908017e..b02de4cb311c703 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -118,27 +118,19 @@  static struct klp_object *klp_find_object(struct klp_patch *patch,
 }
 
 struct klp_find_arg {
-	const char *objname;
 	const char *name;
 	unsigned long addr;
 	unsigned long count;
 	unsigned long pos;
 };
 
-static int klp_find_callback(void *data, const char *name,
-			     struct module *mod, unsigned long addr)
+static int klp_find_callback(void *data, const char *name, unsigned long addr)
 {
 	struct klp_find_arg *args = data;
 
-	if ((mod && !args->objname) || (!mod && args->objname))
-		return 0;
-
 	if (strcmp(args->name, name))
 		return 0;
 
-	if (args->objname && strcmp(args->objname, mod->name))
-		return 0;
-
 	args->addr = addr;
 	args->count++;
 
@@ -175,7 +167,6 @@  static int klp_find_object_symbol(const char *objname, const char *name,
 				  unsigned long sympos, unsigned long *addr)
 {
 	struct klp_find_arg args = {
-		.objname = objname,
 		.name = name,
 		.addr = 0,
 		.count = 0,
@@ -183,7 +174,7 @@  static int klp_find_object_symbol(const char *objname, const char *name,
 	};
 
 	if (objname)
-		module_kallsyms_on_each_symbol(klp_find_callback, &args);
+		module_kallsyms_on_each_symbol(objname, klp_find_callback, &args);
 	else
 		kallsyms_on_each_match_symbol(klp_match_callback, name, &args);
 
diff --git a/kernel/module/kallsyms.c b/kernel/module/kallsyms.c
index f5c5c9175333df7..329cef573675d49 100644
--- a/kernel/module/kallsyms.c
+++ b/kernel/module/kallsyms.c
@@ -495,8 +495,8 @@  unsigned long module_kallsyms_lookup_name(const char *name)
 }
 
 #ifdef CONFIG_LIVEPATCH
-int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
-					     struct module *, unsigned long),
+int module_kallsyms_on_each_symbol(const char *modname,
+				   int (*fn)(void *, const char *, unsigned long),
 				   void *data)
 {
 	struct module *mod;
@@ -510,6 +510,9 @@  int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 		if (mod->state == MODULE_STATE_UNFORMED)
 			continue;
 
+		if (strcmp(modname, mod->name))
+			continue;
+
 		/* Use rcu_dereference_sched() to remain compliant with the sparse tool */
 		preempt_disable();
 		kallsyms = rcu_dereference_sched(mod->kallsyms);
@@ -522,10 +525,16 @@  int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
 				continue;
 
 			ret = fn(data, kallsyms_symbol_name(kallsyms, i),
-				 mod, kallsyms_symbol_value(sym));
+				 kallsyms_symbol_value(sym));
 			if (ret != 0)
 				goto out;
 		}
+
+		/*
+		 * The given module is found, the subsequent modules do not
+		 * need to be compared.
+		 */
+		break;
 	}
 out:
 	mutex_unlock(&module_mutex);