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1840475676
Current IRQ affinity interface does not provide a way to set affinity for the IRQs that will be allocated/activated in the future. This patch creates /proc/irq/default_smp_affinity that lets users set default affinity mask for the newly allocated IRQs. Changing the default does not affect affinity masks for the currently active IRQs, they have to be changed explicitly. Updated based on Paul J's comments and added some more documentation. Signed-off-by: Max Krasnyansky <maxk@qualcomm.com> Cc: pj@sgi.com Cc: a.p.zijlstra@chello.nl Cc: tglx@linutronix.de Cc: rdunlap@xenotime.net Cc: mingo@elte.hu Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
57 lines
2.1 KiB
Plaintext
57 lines
2.1 KiB
Plaintext
ChangeLog:
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Started by Ingo Molnar <mingo@redhat.com>
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Update by Max Krasnyansky <maxk@qualcomm.com>
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SMP IRQ affinity
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/proc/irq/IRQ#/smp_affinity specifies which target CPUs are permitted
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for a given IRQ source. It's a bitmask of allowed CPUs. It's not allowed
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to turn off all CPUs, and if an IRQ controller does not support IRQ
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affinity then the value will not change from the default 0xffffffff.
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/proc/irq/default_smp_affinity specifies default affinity mask that applies
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to all non-active IRQs. Once IRQ is allocated/activated its affinity bitmask
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will be set to the default mask. It can then be changed as described above.
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Default mask is 0xffffffff.
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Here is an example of restricting IRQ44 (eth1) to CPU0-3 then restricting
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it to CPU4-7 (this is an 8-CPU SMP box):
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[root@moon 44]# cd /proc/irq/44
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[root@moon 44]# cat smp_affinity
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ffffffff
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[root@moon 44]# echo 0f > smp_affinity
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[root@moon 44]# cat smp_affinity
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0000000f
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[root@moon 44]# ping -f h
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PING hell (195.4.7.3): 56 data bytes
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...
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--- hell ping statistics ---
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6029 packets transmitted, 6027 packets received, 0% packet loss
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round-trip min/avg/max = 0.1/0.1/0.4 ms
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[root@moon 44]# cat /proc/interrupts | grep 'CPU\|44:'
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CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7
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44: 1068 1785 1785 1783 0 0 0 0 IO-APIC-level eth1
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As can be seen from the line above IRQ44 was delivered only to the first four
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processors (0-3).
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Now lets restrict that IRQ to CPU(4-7).
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[root@moon 44]# echo f0 > smp_affinity
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[root@moon 44]# cat smp_affinity
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000000f0
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[root@moon 44]# ping -f h
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PING hell (195.4.7.3): 56 data bytes
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..
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--- hell ping statistics ---
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2779 packets transmitted, 2777 packets received, 0% packet loss
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round-trip min/avg/max = 0.1/0.5/585.4 ms
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[root@moon 44]# cat /proc/interrupts | 'CPU\|44:'
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CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7
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44: 1068 1785 1785 1783 1784 1069 1070 1069 IO-APIC-level eth1
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This time around IRQ44 was delivered only to the last four processors.
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i.e counters for the CPU0-3 did not change.
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