From de4d1db369785c29d68915edfee0cb70e8199f4c Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Wed, 21 Nov 2007 22:02:58 +0800 Subject: [LIB]: Introduce struct pcounter This just generalises what was introduced by Eric Dumazet for the struct proto inuse field in 286ab3d46058840d68e5d7d52e316c1f7e98c59f: [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 Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- lib/Makefile | 1 + lib/pcounter.c | 26 ++++++++++++++++++++++++++ 2 files changed, 27 insertions(+) create mode 100644 lib/pcounter.c (limited to 'lib') diff --git a/lib/Makefile b/lib/Makefile index 89841dc9d91..543f2502b60 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -61,6 +61,7 @@ obj-$(CONFIG_TEXTSEARCH_KMP) += ts_kmp.o obj-$(CONFIG_TEXTSEARCH_BM) += ts_bm.o obj-$(CONFIG_TEXTSEARCH_FSM) += ts_fsm.o obj-$(CONFIG_SMP) += percpu_counter.o +obj-$(CONFIG_SMP) += pcounter.o obj-$(CONFIG_AUDIT_GENERIC) += audit.o obj-$(CONFIG_SWIOTLB) += swiotlb.o diff --git a/lib/pcounter.c b/lib/pcounter.c new file mode 100644 index 00000000000..93feea59825 --- /dev/null +++ b/lib/pcounter.c @@ -0,0 +1,26 @@ +/* + * Define default pcounter functions + * Note that often used pcounters use dedicated functions to get a speed increase. + * (see DEFINE_PCOUNTER/REF_PCOUNTER_MEMBER) + */ + +#include +#include +#include + +void pcounter_def_add(struct pcounter *self, int inc) +{ + per_cpu_ptr(self->per_cpu_values, smp_processor_id())[0] += inc; +} + +EXPORT_SYMBOL_GPL(pcounter_def_add); + +int pcounter_def_getval(const struct pcounter *self) +{ + int res = 0, cpu; + for_each_possible_cpu(cpu) + res += per_cpu_ptr(self->per_cpu_values, cpu)[0]; + return res; +} + +EXPORT_SYMBOL_GPL(pcounter_def_getval); -- cgit v1.2.3