[RFC v2 8/9] sysfs: Add cpu_avoid file
From: Shrikanth Hegde <hidden>
Date: 2025-06-25 19:12:22
Also in:
lkml
Subsystem:
driver core, kobjects, debugfs and sysfs, the rest · Maintainers:
Greg Kroah-Hartman, "Rafael J. Wysocki", Danilo Krummrich, Linus Torvalds
Add a sysfs file called "avoid" which prints the current CPUs makred as avoid. This could be used by userspace components or tools such as irqbalance. /sys/devices/system/cpu # cat avoid 70-479 Signed-off-by: Shrikanth Hegde <redacted> --- drivers/base/cpu.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 7779ab0ca7ce..51c1207f6f33 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c@@ -300,6 +300,13 @@ static ssize_t print_cpus_isolated(struct device *dev, } static DEVICE_ATTR(isolated, 0444, print_cpus_isolated, NULL); +static ssize_t print_cpus_avoid(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sysfs_emit(buf, "%*pbl\n", cpumask_pr_args(cpu_avoid_mask)); +} +static DEVICE_ATTR(avoid, 0444, print_cpus_avoid, NULL); + #ifdef CONFIG_NO_HZ_FULL static ssize_t print_cpus_nohz_full(struct device *dev, struct device_attribute *attr, char *buf)
@@ -505,6 +512,7 @@ static struct attribute *cpu_root_attrs[] = { &dev_attr_offline.attr, &dev_attr_enabled.attr, &dev_attr_isolated.attr, + &dev_attr_avoid.attr, #ifdef CONFIG_NO_HZ_FULL &dev_attr_nohz_full.attr, #endif
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2.43.0