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| author | Zenghui Yu (Huawei) <zenghui.yu@linux.dev> | 2026-03-11 15:09:40 +0800 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2026-03-30 11:02:29 -0600 |
| commit | 4663a5a2a3483b5f6b049cf7e9705773ab35e6c7 (patch) | |
| tree | e5cfaef0fd9df317b9b21e6b2fed7f266abfd47a | |
| parent | 999084ee0b111aaeb3e0b37b25d180c53ff6b702 (diff) | |
| download | lwn-4663a5a2a3483b5f6b049cf7e9705773ab35e6c7.tar.gz lwn-4663a5a2a3483b5f6b049cf7e9705773ab35e6c7.zip | |
docs: proc: remove description of prof_cpu_mask
Commit 2e5449f4f21a ("profiling: Remove create_prof_cpu_mask().") said that
no one would create /proc/irq/prof_cpu_mask since commit 1f44a225777e
("s390: convert interrupt handling to use generic hardirq", 2013). Remove
the outdated description.
While at it, fix another minor typo (s/DMS/DMA/).
Signed-off-by: Zenghui Yu (Huawei) <zenghui.yu@linux.dev>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20260311070940.94838-1-zenghui.yu@linux.dev>
| -rw-r--r-- | Documentation/filesystems/proc.rst | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst index e2d22a424dcd..873761087f8d 100644 --- a/Documentation/filesystems/proc.rst +++ b/Documentation/filesystems/proc.rst @@ -743,7 +743,7 @@ files are there, and which are missing. in the kernel image cpuinfo Info about the CPU devices Available devices (block and character) - dma Used DMS channels + dma Used DMA channels filesystems Supported filesystems driver Various drivers grouped here, currently rtc (2.4) execdomains Execdomains, related to security (2.4) @@ -877,14 +877,13 @@ i386 and x86_64 platforms support the new IRQ vector displays. Of some interest is the introduction of the /proc/irq directory to 2.4. It could be used to set IRQ to CPU affinity. This means that you can "hook" an IRQ to only one CPU, or to exclude a CPU of handling IRQs. The contents of the -irq subdir is one subdir for each IRQ, and two files; default_smp_affinity and -prof_cpu_mask. +irq subdir is one subdir for each IRQ, and default_smp_affinity. For example:: > ls /proc/irq/ - 0 10 12 14 16 18 2 4 6 8 prof_cpu_mask - 1 11 13 15 17 19 3 5 7 9 default_smp_affinity + 0 10 12 14 16 18 2 4 6 8 default_smp_affinity + 1 11 13 15 17 19 3 5 7 9 > ls /proc/irq/0/ smp_affinity @@ -915,9 +914,6 @@ The node file on an SMP system shows the node to which the device using the IRQ reports itself as being attached. This hardware locality information does not include information about any possible driver locality preference. -prof_cpu_mask specifies which CPUs are to be profiled by the system wide -profiler. Default value is ffffffff (all CPUs if there are only 32 of them). - The way IRQs are routed is handled by the IO-APIC, and it's Round Robin between all the CPUs which are allowed to handle it. As usual the kernel has more info than you and does a better job than you, so the defaults are the |