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authorAmir Vadai <amirv@mellanox.com>2014-05-25 17:47:26 +0300
committerDavid S. Miller <davem@davemloft.net>2014-06-01 19:16:29 -0700
commitc8865b64b05b2f4eeefd369373e9c8aeb069e7a1 (patch)
treefef93ad82529c709aeb8d15fb4330631918698d9 /include/linux/cpumask.h
parent90d0e08e574d1aa8553ee6179fcf3bf2b333ca6d (diff)
downloadlwn-c8865b64b05b2f4eeefd369373e9c8aeb069e7a1.tar.gz
lwn-c8865b64b05b2f4eeefd369373e9c8aeb069e7a1.zip
cpumask: Utility function to set n'th cpu - local cpu first
This function sets the n'th cpu - local cpu's first. For example: in a 16 cores server with even cpu's local, will get the following values: cpumask_set_cpu_local_first(0, numa, cpumask) => cpu 0 is set cpumask_set_cpu_local_first(1, numa, cpumask) => cpu 2 is set ... cpumask_set_cpu_local_first(7, numa, cpumask) => cpu 14 is set cpumask_set_cpu_local_first(8, numa, cpumask) => cpu 1 is set cpumask_set_cpu_local_first(9, numa, cpumask) => cpu 3 is set ... cpumask_set_cpu_local_first(15, numa, cpumask) => cpu 15 is set Curently this function will be used by multi queue networking devices to calculate the irq affinity mask, such that as many local cpu's as possible will be utilized to handle the mq device irq's. Signed-off-by: Amir Vadai <amirv@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/cpumask.h')
-rw-r--r--include/linux/cpumask.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index d08e4d2a9b92..3551d667ef9f 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -257,6 +257,8 @@ static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
set_bit(cpumask_check(cpu), cpumask_bits(dstp));
}
+int cpumask_set_cpu_local_first(int i, int numa_node, cpumask_t *dstp);
+
/**
* cpumask_clear_cpu - clear a cpu in a cpumask
* @cpu: cpu number (< nr_cpu_ids)