tuna: Make --isolate/--include operations affect /proc/irq/default_smp_affinity
When isolating CPUs we affect the IRQ smp_affinity masks, but that will not
affect new devices, to make the isolation operation to stick for that case too we
need to remove the isolated CPUs from the /proc/irq/default_smp_affinity file,
that is what is used to set the initial affinity mask for new device IRQs.
E.g.:
[root@emilia git]# tuna -q enp21s0f0-* -Q
# users affinity
66 enp21s0f0-TxRx-0 0xff ixgbe
67 enp21s0f0-TxRx-1 0xff ixgbe
68 enp21s0f0-TxRx-2 0xff ixgbe
69 enp21s0f0-TxRx-3 0xff ixgbe
[root@emilia git]# cat /proc/irq/default_smp_affinity
ff
[root@emilia git]# tuna -S1 --isolate
[root@emilia git]# tuna -q enp21s0f0-* -Q
# users affinity
66 enp21s0f0-TxRx-0 0,2,4,6 ixgbe
67 enp21s0f0-TxRx-1 0,2,4,6 ixgbe
68 enp21s0f0-TxRx-2 0,2,4,6 ixgbe
69 enp21s0f0-TxRx-3 0,2,4,6 ixgbe
[root@emilia git]# cat /proc/irq/default_smp_affinity
55
>>> hex((1 << 0) | (1 << 2) | (1 << 4) | (1 << 6))
'0x55'
[root@emilia git]# tuna --cpu 6 --isolate
[root@emilia git]# tuna -q enp21s0f0-* -Q
# users affinity
66 enp21s0f0-TxRx-0 0,2,4 ixgbe
67 enp21s0f0-TxRx-1 0,2,4 ixgbe
68 enp21s0f0-TxRx-2 0,2,4 ixgbe
69 enp21s0f0-TxRx-3 0,2,4 ixgbe
[root@emilia git]# cat /proc/irq/default_smp_affinity
15
>>> hex((1 << 0) | (1 << 2) | (1 << 4))
'0x15'
[root@emilia git]# tuna --cpu 1 --include
[root@emilia git]# tuna -q enp21s0f0-* -Q
# users affinity
66 enp21s0f0-TxRx-0 0,1,2,4 ixgbe
67 enp21s0f0-TxRx-1 0,1,2,4 ixgbe
68 enp21s0f0-TxRx-2 0,1,2,4 ixgbe
69 enp21s0f0-TxRx-3 0,1,2,4 ixgbe
[root@emilia git]# cat /proc/irq/default_smp_affinity
17
>>> hex((1 << 0) | (1 << 1) | (1 << 2) | (1 << 4))
'0x17'
Requested-by: Luiz Capitulino <lcapitulino@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Guy Streeter <streeter@redhat.com>
Cc: Jeremy Eder <jeder@redhat.com>
Cc: Jiri Kastner <jkastner@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
1 file changed
