[arch] fix -> not restoring the CPUs to previous scaling governors after the package is built when optimizations are on

CHANGELOG.md

@@ -8,7 +8,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Fixes
 - Arch
     - not skipping dependency checking when the user opts to proceed with a transaction that would break other packages
-
+    - AUR: not restoring the CPUs to previous scaling governors after the package is built when optimizations are on 
 
 ## [0.9.15] 2021-03-03
 ### Improvements

README.md

@@ -218,7 +218,7 @@ suggestions:
     
     c) `ccache` will be added to `BUILDENV` if it is installed on the system and already not defined 
     
-    d) set the device processors to performance mode
+    d) set the device CPUs to performance scaling governor
 
     Obs: For more information about them, have a look at [Makepkg](https://wiki.archlinux.org/index.php/Makepkg)
 

bauh/gems/arch/controller.py

@@ -1944,13 +1944,12 @@ class ArchManager(SoftwareManager):
 
         # building main package
         context.watcher.change_substatus(self.i18n['arch.building.package'].format(bold(context.name)))
-        optimize = bool(context.config['optimize']) and cpu_manager.supports_performance_mode() and not cpu_manager.all_in_performance()
+        optimize = bool(context.config['optimize']) and cpu_manager.supports_performance_mode()
+
+        cpus_changed, cpu_prev_governors = False, None
 
-        cpu_optimized = False
         if optimize:
-            self.logger.info("Setting cpus to performance mode")
+            cpus_changed, cpu_prev_governors = cpu_manager.set_all_cpus_to('performance', context.root_password, self.logger)
-            cpu_manager.set_mode('performance', context.root_password)
-            cpu_optimized = True
 
         try:
             pkgbuilt, output = makepkg.make(pkgdir=context.project_dir,
@@ -1958,9 +1957,9 @@ class ArchManager(SoftwareManager):
                                             handler=context.handler,
                                             custom_pkgbuild=context.custom_pkgbuild_path)
         finally:
-            if cpu_optimized:
+            if cpus_changed and cpu_prev_governors:
-                self.logger.info("Setting cpus to powersave mode")
+                self.logger.info("Restoring CPU governors")
-                cpu_manager.set_mode('powersave', context.root_password)
+                cpu_manager.set_cpus(cpu_prev_governors, context.root_password, {'performance'}, self.logger)
 
         self._update_progress(context, 65)
 

bauh/gems/arch/cpu_manager.py

@@ -1,6 +1,8 @@
 import multiprocessing
 import os
 import traceback
+from logging import Logger
+from typing import Optional, Set, Tuple, Dict
 
 from bauh.commons.system import new_root_subprocess
 
@@ -9,30 +11,67 @@ def supports_performance_mode():
     return os.path.exists('/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor')
 
 
-def all_in_performance() -> bool:
+def current_governors() -> Dict[str, Set[int]]:
-    for i in range(multiprocessing.cpu_count()):
+    governors = {}
-        with open('/sys/devices/system/cpu/cpu{}/cpufreq/scaling_governor'.format(i)) as f:
+    for cpu in range(multiprocessing.cpu_count()):
-            if f.read().strip() != 'performance':
+        with open('/sys/devices/system/cpu/cpu{}/cpufreq/scaling_governor'.format(cpu)) as f:
-                return False
+            gov = f.read().strip()
+            cpus = governors.get(gov, set())
+            cpus.add(cpu)
+            governors[gov] = cpus
 
-    return False
+    return governors
 
 
-def set_mode(mode: str, root_password: str):
+def set_governor(governor: str, root_password: str, cpu_idxs: Optional[Set[int]] = None):
     new_gov_file = '/tmp/bauh_scaling_governor'
     with open(new_gov_file, 'w+') as f:
-        f.write(mode)
+        f.write(governor)
 
-    for i in range(multiprocessing.cpu_count()):
+    for idx in (cpu_idxs if cpu_idxs else range(multiprocessing.cpu_count())):
+        _change_governor(idx, new_gov_file, root_password)
+
+    if os.path.exists(new_gov_file):
         try:
-            gov_file = '/sys/devices/system/cpu/cpu{}/cpufreq/scaling_governor'.format(i)
+            os.remove(new_gov_file)
-            replace = new_root_subprocess(['cp', new_gov_file, gov_file], root_password=root_password)
-            replace.wait()
         except:
             traceback.print_exc()
 
-        if os.path.exists(new_gov_file):
+
-            try:
+def _change_governor(cpu_idx: int, new_gov_file_path: str, root_password: str):
-                os.remove(new_gov_file)
+    try:
-            except:
+        gov_file = '/sys/devices/system/cpu/cpu{}/cpufreq/scaling_governor'.format(cpu_idx)
-                traceback.print_exc()
+        replace = new_root_subprocess(['cp', new_gov_file_path, gov_file], root_password=root_password)
+        replace.wait()
+    except:
+        traceback.print_exc()
+
+
+def set_all_cpus_to(governor: str, root_password: str, logger: Optional[Logger] = None) -> Tuple[bool, Optional[Dict[str, Set[int]]]]:
+    """
+    """
+    cpus_changed, cpu_governors = False, current_governors()
+
+    if cpu_governors:
+        not_in_performance = set()
+        for gov, cpus in cpu_governors.items():
+            if gov != governor:
+                not_in_performance.update(cpus)
+
+        if not_in_performance:
+            if logger:
+                logger.info("Changing CPUs {} governors to '{}'".format(not_in_performance, governor))
+
+            set_governor(governor, root_password, not_in_performance)
+            cpus_changed = True
+
+    return cpus_changed, cpu_governors
+
+
+def set_cpus(governors: Dict[str, Set[int]], root_password: str, ignore_governors: Optional[Set[str]] = None, logger: Optional[Logger] = None):
+    for gov, cpus in governors.items():
+        if not ignore_governors or gov not in ignore_governors:
+            if logger:
+                logger.info("Changing CPUs {} governors to '{}'".format(cpus, gov))
+
+            set_governor(gov, root_password, cpus)