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64 lines
2.8 KiB
Bash
Executable File
64 lines
2.8 KiB
Bash
Executable File
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0-only
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# Copyright (C) 2021 igo95862
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation, version 2.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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set -eu
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LATENCY_MS=3
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MIN_GRANULARITY_MS=0.3
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WAKEUP_GRANULARITY_MS=0.5
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MIGRATION_COST_MS=0.25
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BANDWIDTH_SIZE_MS=3
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NR_MIGRATE=64
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echo "Targeted preemption latency for CPU-bound tasks: ${LATENCY_MS}ms"
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echo "Minimal preemption granularity for CPU-bound tasks: ${MIN_GRANULARITY_MS}ms"
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echo "Wake-up granularity: ${WAKEUP_GRANULARITY_MS}ms"
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echo "Task migration cost: ${MIGRATION_COST_MS}ms"
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echo "Amount of runtime to allocate from global to local pool: ${BANDWIDTH_SIZE_MS}ms"
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echo "Number of tasks to iterate in a single balance run: ${NR_MIGRATE}"
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call_gawk() {
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printf '%s' "$(gawk 'BEGIN {print '"${1}"'}')"
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}
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NPROC="$(nproc)"
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# Linux uses this algorithm to multiply miliseconds
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MODIFIER="$( call_gawk "10 ** 6 * (1 + int(log(${NPROC}) / log(2)))" )"
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LATENCY_NS_FILE="/sys/kernel/debug/sched/latency_ns"
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MIN_GRANULARITY_NS_FILE="/sys/kernel/debug/sched/min_granularity_ns"
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WAKEUP_GRANULARITY_NS_FILE="/sys/kernel/debug/sched/wakeup_granularity_ns"
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MIGRATION_COST_NS_FILE="/sys/kernel/debug/sched/migration_cost_ns"
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BANDWIDTH_SIZE_US_FILE="/proc/sys/kernel/sched_cfs_bandwidth_slice_us"
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NR_MIGRATE_FILE="/sys/kernel/debug/sched/nr_migrate"
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if [ ! -f "$LATENCY_NS_FILE" ]; then
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echo "Detected kernel <5.13. Using legacy locations."
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LATENCY_NS_FILE="/proc/sys/kernel/sched_latency_ns"
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MIN_GRANULARITY_NS_FILE="/proc/sys/kernel/sched_min_granularity_ns"
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WAKEUP_GRANULARITY_NS_FILE="/proc/sys/kernel/sched_wakeup_granularity_ns"
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MIGRATION_COST_NS_FILE="/proc/sys/kernel/sched_migration_cost_ns"
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NR_MIGRATE_FILE="/proc/sys/kernel/sched_nr_migrate"
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fi
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printf '%s' "$( call_gawk "int(${LATENCY_MS} * ${MODIFIER})" )" > "$LATENCY_NS_FILE"
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printf '%s' "$( call_gawk "int(${MIN_GRANULARITY_MS} * ${MODIFIER})" )" > "$MIN_GRANULARITY_NS_FILE"
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printf '%s' "$( call_gawk "int(${WAKEUP_GRANULARITY_MS} * ${MODIFIER})" )" > "$WAKEUP_GRANULARITY_NS_FILE"
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printf '%s' "$( call_gawk "int(${MIGRATION_COST_MS} * ${MODIFIER})" )" > "$MIGRATION_COST_NS_FILE"
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printf '%s' "$( call_gawk "int(${BANDWIDTH_SIZE_MS} * 1000)" )" > "$BANDWIDTH_SIZE_US_FILE"
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printf '%s' "$NR_MIGRATE" > "$NR_MIGRATE_FILE"
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