diff options
| -rw-r--r-- | cnf/make.conf.example | 17 | ||||
| -rw-r--r-- | lib/_emerge/actions.py | 45 | ||||
| -rw-r--r-- | man/make.conf.5 | 16 |
3 files changed, 78 insertions, 0 deletions
diff --git a/cnf/make.conf.example b/cnf/make.conf.example index 5b2229465..2e33a6e50 100644 --- a/cnf/make.conf.example +++ b/cnf/make.conf.example @@ -291,6 +291,23 @@ # unset. #PORTAGE_IONICE_COMMAND="ionice -c 3 -p \${PID}" # +# PORTAGE_SCHEDULING_POLICY allows changing the current scheduling policy. The +# supported options are 'other', 'batch', 'idle', 'fifo' and 'round-robin'. When +# unset, the scheduling policy remains unchanged, by default Linux uses 'other' +# policy. Users that wish to minimize the Portage's impact on system +# responsiveness should set scheduling policy to 'idle' which significantly +# reduces the disruption to the rest of the system by scheduling Portage as +# extremely low priority processes. +# +#PORTAGE_SCHEDULING_POLICY="idle" +# +# PORTAGE_SCHEDULING_PRIORITY allows changing the priority (1-99) of the current +# scheduling policy, only applies if PORTAGE_SCHEDULING_POLICY is set to 'fifo' +# or 'round-robin', for others the only supported priority is 0, If unset, +# defaults to lowest priority of the selected scheduling policy. +# +#PORTAGE_SCHEDULING_PRIORITY="99" +# # AUTOCLEAN enables portage to automatically clean out older or overlapping # packages from the system after every successful merge. This is the # same as running 'emerge -c' after every merge. Set with: "yes" or "no". diff --git a/lib/_emerge/actions.py b/lib/_emerge/actions.py index e2f3f2ccf..e79bb30c0 100644 --- a/lib/_emerge/actions.py +++ b/lib/_emerge/actions.py @@ -3054,6 +3054,7 @@ def config_protect_check(trees): def apply_priorities(settings): ionice(settings) nice(settings) + set_scheduling_policy(settings) def nice(settings): @@ -3094,6 +3095,50 @@ def ionice(settings): ) +def set_scheduling_policy(settings): + scheduling_policy = settings.get("PORTAGE_SCHEDULING_POLICY") + scheduling_priority = settings.get("PORTAGE_SCHEDULING_PRIORITY") + + if platform.system() != "Linux" or not scheduling_policy: + return os.EX_OK + + policies = { + "other": os.SCHED_OTHER, + "batch": os.SCHED_BATCH, + "idle": os.SCHED_IDLE, + "fifo": os.SCHED_FIFO, + "round-robin": os.SCHED_RR, + } + + out = portage.output.EOutput() + + if scheduling_policy in policies: + policy = policies[scheduling_policy] + else: + out.eerror("Invalid policy in PORTAGE_SCHEDULING_POLICY.") + out.eerror( + "See the make.conf(5) man page for PORTAGE_SCHEDULING_POLICY usage instructions." + ) + return os.EX_USAGE + + if not scheduling_priority: + scheduling_priority = os.sched_get_priority_min(policy) + else: + scheduling_priority = int(scheduling_priority) + if scheduling_priority not in range( + os.sched_get_priority_min(policy), os.sched_get_priority_max(policy) + 1 + ): + out.eerror("Invalid priority in PORTAGE_SCHEDULING_PRIORITY.") + out.eerror( + "See the make.conf(5) man page for PORTAGE_SCHEDULING_PRIORITY usage instructions." + ) + return os.EX_USAGE + + os.sched_setscheduler(portage.getpid(), policy, os.sched_param(scheduling_priority)) + + return os.EX_OK + + def setconfig_fallback(root_config): setconfig = root_config.setconfig setconfig._create_default_config() diff --git a/man/make.conf.5 b/man/make.conf.5 index bde92af1a..a527a3f74 100644 --- a/man/make.conf.5 +++ b/man/make.conf.5 @@ -1080,6 +1080,22 @@ will set idle io priority. For more information about ionice, see Portage will also set the autogroup-nice value (see fBsched\fR(7))), if FEATURES="pid\-sandbox" is enabled. .TP +\fBPORTAGE_SCHEDULING_POLICY\fR = \fI[policy name]\fR +Allows changing the current scheduling policy. The supported options are +\fBother\fR, \fBbatch\fR, \fBidle\fR, \fBfifo\fR, and \fBround-robin\fR. When +unset, the scheduling policy remains unchanged, by default Linux uses 'other' +policy. Users that wish to minimize the Portage's impact on system +responsiveness should set scheduling policy to \fBidle\fR, which significantly +reduces the disruption to the rest of the system by scheduling Portage as +extremely low priority processes. see \fBsched\fR(7) for more information. +.TP +\fBPORTAGE_SCHEDULING_PRIORITY\fR = \fI[priority]\fR +Allows changing the priority (1-99) of the current scheduling policy, only +applies if PORTAGE _SCHEDULING_POLICY is set to 'fifo' or 'round-robin', +for others the only supported priority is 0, If unset, defaults to lowest +priority of the selected scheduling policy. For more information about +scheduler, see \fBsched\fR(7). This variable is unset by default. +.TP .B PORTAGE_LOG_FILTER_FILE_CMD This variable specifies a command that filters build log output to a log file. In order to filter ANSI escape codes from build logs, |