Messages in this thread | | | Date | Thu, 28 Oct 2010 14:01:03 +0200 | From | Tejun Heo <> | Subject | Re: [PATCH] x86-32: Allocate irq stacks seperate from percpu area |
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Hello, Eric.
On 10/27/2010 10:55 PM, Eric Dumazet wrote: > I changed the User/Kernel split from 3G/1G to 1G/3G so that I have > LOWMEM on both nodes. Still pcpu allocates all percpu from node0. ... > [ 0.000000] setup_percpu: NR_CPUS:64 nr_cpumask_bits:64 nr_cpu_ids:16 nr_node_ids:8 > [ 0.000000] PERCPU: Embedded 16 pages/cpu @bea00000 s41984 r0 d23552 u131072 > [ 0.000000] pcpu-alloc: s41984 r0 d23552 u131072 alloc=1*2097152 > [ 0.000000] pcpu-alloc: [0] 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 > [ 0.000000] setup_percpu: cpu=0 early_cpu_to_node()=0 > [ 0.000000] setup_percpu: cpu=1 early_cpu_to_node()=0 > [ 0.000000] setup_percpu: cpu=2 early_cpu_to_node()=0 > [ 0.000000] setup_percpu: cpu=3 early_cpu_to_node()=0 > [ 0.000000] setup_percpu: cpu=4 early_cpu_to_node()=0 > [ 0.000000] setup_percpu: cpu=5 early_cpu_to_node()=0 > [ 0.000000] setup_percpu: cpu=6 early_cpu_to_node()=0 > [ 0.000000] setup_percpu: cpu=7 early_cpu_to_node()=0 > [ 0.000000] setup_percpu: cpu=8 early_cpu_to_node()=0 > [ 0.000000] setup_percpu: cpu=9 early_cpu_to_node()=0 > [ 0.000000] setup_percpu: cpu=10 early_cpu_to_node()=0 > [ 0.000000] setup_percpu: cpu=11 early_cpu_to_node()=0 > [ 0.000000] setup_percpu: cpu=12 early_cpu_to_node()=0 > [ 0.000000] setup_percpu: cpu=13 early_cpu_to_node()=0 > [ 0.000000] setup_percpu: cpu=14 early_cpu_to_node()=0 > [ 0.000000] setup_percpu: cpu=15 early_cpu_to_node()=0
So, this is the problem. percpu uses early_cpu_to_node() to determine which cpu belongs to which NUMA node and according to it all CPUs are on node 0, so percpu is configured accordingly. I have no idea why early_cpu_to_node() is set up like that tho. Ingo, Thomas, any ideas?
-- tejun
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