docs: proc: remove description of prof_cpu_mask
Subsystems (3)
PATCH 1/1 docs: proc: remove description of prof_cpu_mask
From: "Zenghui Yu (Huawei)" <[email protected]>
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 Remove the outdated description.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/).
--- Documentation/filesystems/proc.rst | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-)
Documentation/filesystems/proc.rst +4 -8
@@ -727,7 +727,7 @@ 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)
@@ -861,14 +861,13 @@ 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
@@ -899,9 +898,6 @@ 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
Signature · 1 line
2.53.0
Hi Jon,
Quoted 46 lines · Zenghui Yu
From: "Zenghui Yu (Huawei)" <[email protected]>
Commit
2e5449f4f21a("profiling: Removecreate_prof_cpu_mask().") said that no one would create/proc/irq/prof_cpu_masksince commit1f44a225777e("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) <[email protected]>--- Documentation/filesystems/proc.rst | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-)Documentation/filesystems/proc.rst +4
-5@@ -727,7 +727,7 @@ 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)@@ -861,14 +861,13 @@ 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
Documentation/filesystems/proc.rst The node file on an SMP system shows the node to which the device using the IRQ · line 903
Quoted 9 lines
Documentation/filesystems/proc.rst +0
-3@@ -899,9 +898,6 @@ 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
Will you pick this patch up for 7.1? Or please let me know if there are any points that need improvement.
Thanks,
Zenghui
Quoted 7 lines · Zenghui Yu
From: "Zenghui Yu (Huawei)" <[email protected]>
Commit
2e5449f4f21a("profiling: Removecreate_prof_cpu_mask().") said that no one would create/proc/irq/prof_cpu_masksince commit1f44a225777e("s390: convert interrupt handling to use generic hardirq", 2013). Remove the outdated description.
Quoted 6 lines
While at it, fix another minor typo (s/DMS/DMA/).
Signed-off-by Zenghui Yu (Huawei) <[email protected]>--- Documentation/filesystems/proc.rst | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-)
Applied, thanks.
jon