dcc411e7bf
PJ is redesiging how affinity hinting works in the kernel, the future model will just tell us to ignore an irq, and the kernel will handle placement for us. As such we can remove the affinity_hint recognition entirely Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
101 lines
2.4 KiB
C
101 lines
2.4 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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char *line = NULL;
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size_t size = 0;
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FILE *file;
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sprintf(buf, "/proc/irq/%i/smp_affinity", info->irq);
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file = fopen(buf, "r");
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if (!file)
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return 1;
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if (getline(&line, &size, file)==0) {
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free(line);
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fclose(file);
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return 1;
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}
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cpumask_parse_user(line, strlen(line), current_mask);
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fclose(file);
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free(line);
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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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cpumask_t applied_mask;
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int valid_mask = 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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applied_mask = info->assigned_obj->mask;
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valid_mask = 1;
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}
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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 (!valid_mask || check_affinity(info, applied_mask))
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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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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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