libmodprobe: Do not reload modules previously instantiated
For modprobe operation.
For an interlocking driver set of about 50 modules, the impact of
their dependencies resulted in a 30 second impact in boot time
trying to load previously loaded modules. This impact is handily
eliminated by keeping a list of modules paths that have been loaded
and skipping them proactively.
Test: Confirmed device boot and 50 module set of drivers functions.
Test: libmodprobe_tests
Bug: 142938937
Bug: 140827934
Change-Id: Iccd11399d6043b38cbd5f93578ee202022e7770c
diff --git a/libmodprobe/libmodprobe_ext.cpp b/libmodprobe/libmodprobe_ext.cpp
index 2efcac2..8bebe4c 100644
--- a/libmodprobe/libmodprobe_ext.cpp
+++ b/libmodprobe/libmodprobe_ext.cpp
@@ -30,8 +30,9 @@
return false;
}
+ auto canonical_name = MakeCanonical(path_name);
std::string options = "";
- auto options_iter = module_options_.find(MakeCanonical(path_name));
+ auto options_iter = module_options_.find(canonical_name);
if (options_iter != module_options_.end()) {
options = options_iter->second;
}
@@ -44,6 +45,7 @@
if (ret != 0) {
if (errno == EEXIST) {
// Module already loaded
+ module_loaded_.emplace(canonical_name);
return true;
}
LOG(ERROR) << "Failed to insmod '" << path_name << "' with args '" << options << "'";
@@ -51,15 +53,18 @@
}
LOG(INFO) << "Loaded kernel module " << path_name;
+ module_loaded_.emplace(canonical_name);
return true;
}
bool Modprobe::Rmmod(const std::string& module_name) {
- int ret = syscall(__NR_delete_module, MakeCanonical(module_name).c_str(), O_NONBLOCK);
+ auto canonical_name = MakeCanonical(module_name);
+ int ret = syscall(__NR_delete_module, canonical_name.c_str(), O_NONBLOCK);
if (ret != 0) {
PLOG(ERROR) << "Failed to remove module '" << module_name << "'";
return false;
}
+ module_loaded_.erase(canonical_name);
return true;
}