de4d1db369
This just generalises what was introduced by Eric Dumazet for the struct proto
inuse field in 286ab3d460:
[NET]: Define infrastructure to keep 'inuse' changes in an efficent SMP/NUMA way.
Please look at the comment in there to see the rationale.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
26 lines
624 B
C
26 lines
624 B
C
/*
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* Define default pcounter functions
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* Note that often used pcounters use dedicated functions to get a speed increase.
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* (see DEFINE_PCOUNTER/REF_PCOUNTER_MEMBER)
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*/
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#include <linux/module.h>
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#include <linux/pcounter.h>
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#include <linux/smp.h>
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void pcounter_def_add(struct pcounter *self, int inc)
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{
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per_cpu_ptr(self->per_cpu_values, smp_processor_id())[0] += inc;
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}
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EXPORT_SYMBOL_GPL(pcounter_def_add);
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int pcounter_def_getval(const struct pcounter *self)
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{
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int res = 0, cpu;
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for_each_possible_cpu(cpu)
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res += per_cpu_ptr(self->per_cpu_values, cpu)[0];
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return res;
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}
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EXPORT_SYMBOL_GPL(pcounter_def_getval);
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