bitmap, irq: add smp_affinity_list interface to /proc/irq
Manually adjusting the smp_affinity for IRQ's becomes unwieldy when the cpu count is large. Setting smp affinity to cpus 256 to 263 would be: echo 000000ff,00000000,00000000,00000000,00000000,00000000,00000000,00000000 > smp_affinity instead of: echo 256-263 > smp_affinity_list Think about what it looks like for cpus around say, 4088 to 4095. We already have many alternate "list" interfaces: /sys/devices/system/cpu/cpuX/indexY/shared_cpu_list /sys/devices/system/cpu/cpuX/topology/thread_siblings_list /sys/devices/system/cpu/cpuX/topology/core_siblings_list /sys/devices/system/node/nodeX/cpulist /sys/devices/pci***/***/local_cpulist Add a companion interface, smp_affinity_list to use cpu lists instead of cpu maps. This conforms to other companion interfaces where both a map and a list interface exists. This required adding a bitmap_parselist_user() function in a manner similar to the bitmap_parse_user() function. [akpm@linux-foundation.org: make __bitmap_parselist() static] Signed-off-by: Mike Travis <travis@sgi.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jack Steiner <steiner@sgi.com> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
committed by
Linus Torvalds
parent
e50c1f609c
commit
4b060420a5
@@ -19,7 +19,7 @@ static struct proc_dir_entry *root_irq_dir;
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#ifdef CONFIG_SMP
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static int irq_affinity_proc_show(struct seq_file *m, void *v)
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static int show_irq_affinity(int type, struct seq_file *m, void *v)
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{
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struct irq_desc *desc = irq_to_desc((long)m->private);
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const struct cpumask *mask = desc->irq_data.affinity;
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@@ -28,7 +28,10 @@ static int irq_affinity_proc_show(struct seq_file *m, void *v)
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if (irqd_is_setaffinity_pending(&desc->irq_data))
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mask = desc->pending_mask;
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#endif
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seq_cpumask(m, mask);
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if (type)
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seq_cpumask_list(m, mask);
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else
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seq_cpumask(m, mask);
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seq_putc(m, '\n');
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return 0;
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}
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@@ -59,7 +62,18 @@ static int irq_affinity_hint_proc_show(struct seq_file *m, void *v)
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#endif
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int no_irq_affinity;
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static ssize_t irq_affinity_proc_write(struct file *file,
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static int irq_affinity_proc_show(struct seq_file *m, void *v)
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{
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return show_irq_affinity(0, m, v);
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}
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static int irq_affinity_list_proc_show(struct seq_file *m, void *v)
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{
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return show_irq_affinity(1, m, v);
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}
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static ssize_t write_irq_affinity(int type, struct file *file,
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const char __user *buffer, size_t count, loff_t *pos)
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{
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unsigned int irq = (int)(long)PDE(file->f_path.dentry->d_inode)->data;
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@@ -72,7 +86,10 @@ static ssize_t irq_affinity_proc_write(struct file *file,
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if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
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return -ENOMEM;
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err = cpumask_parse_user(buffer, count, new_value);
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if (type)
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err = cpumask_parselist_user(buffer, count, new_value);
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else
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err = cpumask_parse_user(buffer, count, new_value);
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if (err)
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goto free_cpumask;
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@@ -100,11 +117,28 @@ free_cpumask:
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return err;
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}
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static ssize_t irq_affinity_proc_write(struct file *file,
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const char __user *buffer, size_t count, loff_t *pos)
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{
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return write_irq_affinity(0, file, buffer, count, pos);
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}
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static ssize_t irq_affinity_list_proc_write(struct file *file,
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const char __user *buffer, size_t count, loff_t *pos)
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{
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return write_irq_affinity(1, file, buffer, count, pos);
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}
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static int irq_affinity_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, irq_affinity_proc_show, PDE(inode)->data);
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}
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static int irq_affinity_list_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, irq_affinity_list_proc_show, PDE(inode)->data);
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}
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static int irq_affinity_hint_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, irq_affinity_hint_proc_show, PDE(inode)->data);
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@@ -125,6 +159,14 @@ static const struct file_operations irq_affinity_hint_proc_fops = {
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.release = single_release,
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};
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static const struct file_operations irq_affinity_list_proc_fops = {
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.open = irq_affinity_list_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.write = irq_affinity_list_proc_write,
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};
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static int default_affinity_show(struct seq_file *m, void *v)
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{
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seq_cpumask(m, irq_default_affinity);
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@@ -289,6 +331,10 @@ void register_irq_proc(unsigned int irq, struct irq_desc *desc)
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proc_create_data("affinity_hint", 0400, desc->dir,
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&irq_affinity_hint_proc_fops, (void *)(long)irq);
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/* create /proc/irq/<irq>/smp_affinity_list */
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proc_create_data("smp_affinity_list", 0600, desc->dir,
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&irq_affinity_list_proc_fops, (void *)(long)irq);
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proc_create_data("node", 0444, desc->dir,
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&irq_node_proc_fops, (void *)(long)irq);
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#endif
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