55c5c321c7
For aarch64, the PPIs format in /proc/interrputs can be parsed and add to interrupt db, and next, the number of interrupts is counted and used to calculate the load. Finally these interrupts maybe scheduled between the NUMA domains. Acctually, the PPIs cannot change aff, and it should not be added to interrupt db. This patch fix it. Add a check before add a interrupt to db, just only reads the irq's aff, and write it back to avoid any impact on the system, According to the result of writing to fitler the irq.
88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/*
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* Copyright (C) 2006, Intel Corporation
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* Copyright (C) 2012, Neil Horman <nhorman@tuxdriver.com>
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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 int check_affinity(struct irq_info *info, cpumask_t applied_mask)
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{
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cpumask_t current_mask;
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char buf[PATH_MAX];
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sprintf(buf, "/proc/irq/%i/smp_affinity", info->irq);
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if (process_one_line(buf, get_mask_from_bitmap, ¤t_mask) < 0)
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return 1;
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return cpus_equal(applied_mask, current_mask);
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}
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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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int ret = 0;
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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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/*
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* Don't activate anything for which we have an invalid mask
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*/
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if (check_affinity(info, info->assigned_obj->mask))
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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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cpumask_scnprintf(buf, PATH_MAX, info->assigned_obj->mask);
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ret = fprintf(file, "%s", buf);
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if (ret < 0) {
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log(TO_ALL, LOG_WARNING, "cannot change irq %i's affinity, add it to banned list", info->irq);
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add_banned_irq(info->irq);
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remove_one_irq_from_db(info->irq);
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}
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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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