3252189949
The new balancer can now deal with affintiy hinting again, this time in a reasonably sane manner. Whereas before having an affintiy hint caused irqbalance to just assign that hint as the affinity, we now have a policy based operation, controlled by the hintpolicy option. The policy can be one of: exact - affinity_hint is applied for that irq without balancing consideration subset - balancing takes place, but assigned affinity will be a subset of the hint ignore - affinity_hint is ignored entirely
71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/*
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* Copyright (C) 2006, Intel Corporation
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*
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* This file is part of irqbalance
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*
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* This program file is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program in a file named COPYING; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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/*
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* This file contains the code to communicate a selected distribution / mapping
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* of interrupts to the kernel.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdint.h>
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#include "irqbalance.h"
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static void activate_mapping(struct irq_info *info, void *data __attribute__((unused)))
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{
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char buf[PATH_MAX];
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FILE *file;
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cpumask_t applied_mask;
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/*
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* only activate mappings for irqs that have moved
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*/
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if (!info->moved)
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return;
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if (!info->assigned_obj)
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return;
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sprintf(buf, "/proc/irq/%i/smp_affinity", info->irq);
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file = fopen(buf, "w");
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if (!file)
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return;
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if ((hint_policy == HINT_POLICY_EXACT) &&
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(!cpus_empty(info->affinity_hint)))
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applied_mask = info->affinity_hint;
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else
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applied_mask = info->assigned_obj->mask;
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cpumask_scnprintf(buf, PATH_MAX, applied_mask);
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fprintf(file, "%s", buf);
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fclose(file);
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info->moved = 0; /*migration is done*/
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}
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void activate_mappings(void)
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{
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for_each_irq(NULL, activate_mapping, NULL);
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}
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