| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <processgroup/sched_policy.h> |
| |
| #define LOG_TAG "SchedPolicy" |
| |
| #include <errno.h> |
| #include <unistd.h> |
| |
| #include <android-base/logging.h> |
| #include <android-base/threads.h> |
| #include <cgroup_map.h> |
| #include <processgroup/processgroup.h> |
| |
| using android::base::GetThreadId; |
| |
| /* Re-map SP_DEFAULT to the system default policy, and leave other values unchanged. |
| * Call this any place a SchedPolicy is used as an input parameter. |
| * Returns the possibly re-mapped policy. |
| */ |
| static inline SchedPolicy _policy(SchedPolicy p) { |
| return p == SP_DEFAULT ? SP_SYSTEM_DEFAULT : p; |
| } |
| |
| #if defined(__ANDROID__) |
| |
| int set_cpuset_policy(int tid, SchedPolicy policy) { |
| if (tid == 0) { |
| tid = GetThreadId(); |
| } |
| policy = _policy(policy); |
| |
| switch (policy) { |
| case SP_BACKGROUND: |
| return SetTaskProfiles(tid, |
| {"HighEnergySaving", "ProcessCapacityLow", "LowIoPriority", |
| "TimerSlackHigh"}, |
| true) |
| ? 0 |
| : -1; |
| case SP_FOREGROUND: |
| case SP_AUDIO_APP: |
| case SP_AUDIO_SYS: |
| return SetTaskProfiles(tid, |
| {"HighPerformance", "ProcessCapacityHigh", "HighIoPriority", |
| "TimerSlackNormal"}, |
| true) |
| ? 0 |
| : -1; |
| case SP_TOP_APP: |
| return SetTaskProfiles(tid, |
| {"MaxPerformance", "ProcessCapacityMax", "MaxIoPriority", |
| "TimerSlackNormal"}, |
| true) |
| ? 0 |
| : -1; |
| case SP_SYSTEM: |
| return SetTaskProfiles(tid, {"ServiceCapacityLow", "TimerSlackNormal"}, true) ? 0 : -1; |
| case SP_RESTRICTED: |
| return SetTaskProfiles(tid, {"ServiceCapacityRestricted", "TimerSlackNormal"}, true) |
| ? 0 |
| : -1; |
| default: |
| break; |
| } |
| |
| return 0; |
| } |
| |
| int set_sched_policy(int tid, SchedPolicy policy) { |
| if (tid == 0) { |
| tid = GetThreadId(); |
| } |
| policy = _policy(policy); |
| |
| #if POLICY_DEBUG |
| char statfile[64]; |
| char statline[1024]; |
| char thread_name[255]; |
| |
| snprintf(statfile, sizeof(statfile), "/proc/%d/stat", tid); |
| memset(thread_name, 0, sizeof(thread_name)); |
| |
| unique_fd fd(TEMP_FAILURE_RETRY(open(statfile, O_RDONLY | O_CLOEXEC))); |
| if (fd >= 0) { |
| int rc = read(fd, statline, 1023); |
| statline[rc] = 0; |
| char* p = statline; |
| char* q; |
| |
| for (p = statline; *p != '('; p++) |
| ; |
| p++; |
| for (q = p; *q != ')'; q++) |
| ; |
| |
| strncpy(thread_name, p, (q - p)); |
| } |
| switch (policy) { |
| case SP_BACKGROUND: |
| SLOGD("vvv tid %d (%s)", tid, thread_name); |
| break; |
| case SP_FOREGROUND: |
| case SP_AUDIO_APP: |
| case SP_AUDIO_SYS: |
| case SP_TOP_APP: |
| SLOGD("^^^ tid %d (%s)", tid, thread_name); |
| break; |
| case SP_SYSTEM: |
| SLOGD("/// tid %d (%s)", tid, thread_name); |
| break; |
| case SP_RT_APP: |
| SLOGD("RT tid %d (%s)", tid, thread_name); |
| break; |
| default: |
| SLOGD("??? tid %d (%s)", tid, thread_name); |
| break; |
| } |
| #endif |
| |
| switch (policy) { |
| case SP_BACKGROUND: |
| return SetTaskProfiles(tid, {"HighEnergySaving", "LowIoPriority", "TimerSlackHigh"}, |
| true) |
| ? 0 |
| : -1; |
| case SP_FOREGROUND: |
| case SP_AUDIO_APP: |
| case SP_AUDIO_SYS: |
| return SetTaskProfiles(tid, {"HighPerformance", "HighIoPriority", "TimerSlackNormal"}, |
| true) |
| ? 0 |
| : -1; |
| case SP_TOP_APP: |
| return SetTaskProfiles(tid, {"MaxPerformance", "MaxIoPriority", "TimerSlackNormal"}, |
| true) |
| ? 0 |
| : -1; |
| case SP_RT_APP: |
| return SetTaskProfiles( |
| tid, {"RealtimePerformance", "MaxIoPriority", "TimerSlackNormal"}, true) |
| ? 0 |
| : -1; |
| default: |
| return SetTaskProfiles(tid, {"TimerSlackNormal"}, true) ? 0 : -1; |
| } |
| |
| return 0; |
| } |
| |
| bool cpusets_enabled() { |
| static bool enabled = (CgroupMap::GetInstance().FindController("cpuset").IsUsable()); |
| return enabled; |
| } |
| |
| bool schedboost_enabled() { |
| static bool enabled = (CgroupMap::GetInstance().FindController("schedtune").IsUsable()); |
| return enabled; |
| } |
| |
| static int getCGroupSubsys(int tid, const char* subsys, std::string& subgroup) { |
| auto controller = CgroupMap::GetInstance().FindController(subsys); |
| |
| if (!controller.IsUsable()) return -1; |
| |
| if (!controller.GetTaskGroup(tid, &subgroup)) { |
| LOG(ERROR) << "Failed to find cgroup for tid " << tid; |
| return -1; |
| } |
| return 0; |
| } |
| |
| int get_sched_policy(int tid, SchedPolicy* policy) { |
| if (tid == 0) { |
| tid = GetThreadId(); |
| } |
| |
| std::string group; |
| if (schedboost_enabled()) { |
| if (getCGroupSubsys(tid, "schedtune", group) < 0) return -1; |
| } |
| if (group.empty() && cpusets_enabled()) { |
| if (getCGroupSubsys(tid, "cpuset", group) < 0) return -1; |
| } |
| |
| // TODO: replace hardcoded directories |
| if (group.empty()) { |
| *policy = SP_FOREGROUND; |
| } else if (group == "foreground") { |
| *policy = SP_FOREGROUND; |
| } else if (group == "system-background") { |
| *policy = SP_SYSTEM; |
| } else if (group == "background") { |
| *policy = SP_BACKGROUND; |
| } else if (group == "top-app") { |
| *policy = SP_TOP_APP; |
| } else if (group == "restricted") { |
| *policy = SP_RESTRICTED; |
| } else { |
| errno = ERANGE; |
| return -1; |
| } |
| return 0; |
| } |
| |
| #else |
| |
| /* Stubs for non-Android targets. */ |
| |
| int set_sched_policy(int, SchedPolicy) { |
| return 0; |
| } |
| |
| int get_sched_policy(int, SchedPolicy* policy) { |
| *policy = SP_SYSTEM_DEFAULT; |
| return 0; |
| } |
| |
| #endif |
| |
| const char* get_sched_policy_name(SchedPolicy policy) { |
| policy = _policy(policy); |
| static const char* const kSchedPolicyNames[] = { |
| [SP_BACKGROUND] = "bg", [SP_FOREGROUND] = "fg", [SP_SYSTEM] = " ", |
| [SP_AUDIO_APP] = "aa", [SP_AUDIO_SYS] = "as", [SP_TOP_APP] = "ta", |
| [SP_RT_APP] = "rt", [SP_RESTRICTED] = "rs", |
| }; |
| static_assert(arraysize(kSchedPolicyNames) == SP_CNT, "missing name"); |
| if (policy < SP_BACKGROUND || policy >= SP_CNT) { |
| return "error"; |
| } |
| return kSchedPolicyNames[policy]; |
| } |