pa-fazil
/
android_system_core
mirror of https://github.com/fazilsheik96/android_system_core.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

boost uclamp_min for loading modules in parallel 

Unlike loading modules in serial, current parallel method
cannot accumlate its utilization so usage of big cpu is really
low in heterogeneous system, To make use of big core when we
load kernel modules in parallel. we boost uclamp min for
these parallel threads.

Bug: 288847187
Test: redeuce about 6~10%(30-55ms) loading time for Pixel 7
Change-Id: I55e9ee4294f93b3039d519b5716fa55d58f3d625
Signed-off-by: Chungkai Mei <chungkai@google.com>
This commit is contained in:
Chungkai Mei 2023-06-29 04:17:39 +00:00 committed by Fazil Sheik
parent df5fad696f
commit b1488addda
1 changed files with 26 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
libmodprobe/libmodprobe.cpp
View File

@ -19,6 +19,8 @@
#include <fnmatch.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sched.h>
#include <unistd.h>
#include <algorithm>
#include <map>
@ -33,6 +35,19 @@
#include <android-base/strings.h>
#include <android-base/unique_fd.h>
struct sched_attr {
unsigned int size;
unsigned int sched_policy;
unsigned long long sched_flags;
int sched_nice;
unsigned int sched_priority;
unsigned long long sched_runtime;
unsigned long long sched_deadline;
unsigned long long sched_period;
unsigned int sched_util_min;
unsigned int sched_util_max;
};
std::string Modprobe::MakeCanonical(const std::string& module_path) {
auto start = module_path.find_last_of('/');
if (start == std::string::npos) {
@ -497,6 +512,17 @@ bool Modprobe::LoadModulesParallel(int num_threads) {
// Load independent modules in parallel
auto thread_function = [&] {
#if defined(__NR_sched_setattr) && defined(SCHED_FLAG_RESET_ON_FORK)
int pid = getpid();
sched_attr attr = {};
attr.size = sizeof(attr);
attr.sched_flags =
(SCHED_FLAG_RESET_ON_FORK | SCHED_FLAG_KEEP_ALL | SCHED_FLAG_UTIL_CLAMP_MIN);
attr.sched_util_min = 1024;
syscall(__NR_sched_setattr, pid, attr, 0);
#endif
std::unique_lock lk(vector_lock);
while (!mods_path_to_load.empty()) {
auto ret_load = true;