[LIB] pcounter : unline too big functions
Before pushing pcounter to Linus tree, I would like to make some adjustments.
Goal is to reduce kernel text size, by unlining too big functions.
When a pcounter is bound to a statically defined per_cpu variable,
we define two small helpers functions. (No more folding function
using the fat for_each_possible_cpu(cpu) ... )
static DEFINE_PER_CPU(int, NAME##_pcounter_values);
static void NAME##_pcounter_add(struct pcounter *self, int val)
{
__get_cpu_var(NAME##_pcounter_values) += val;
}
static int NAME##_pcounter_getval(const struct pcounter *self, int cpu)
{
return per_cpu(NAME##_pcounter_values, cpu);
}
Fast path is therefore unchanged, while folding/alloc/free is now unlined.
This saves 228 bytes on i386
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/lib/pcounter.c b/lib/pcounter.c
index 93feea5..9b56807 100644
--- a/lib/pcounter.c
+++ b/lib/pcounter.c
@@ -7,20 +7,52 @@
#include <linux/module.h>
#include <linux/pcounter.h>
#include <linux/smp.h>
+#include <linux/cpumask.h>
-void pcounter_def_add(struct pcounter *self, int inc)
+static void pcounter_dyn_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)
+static int pcounter_dyn_getval(const struct pcounter *self, int cpu)
{
- int res = 0, cpu;
- for_each_possible_cpu(cpu)
- res += per_cpu_ptr(self->per_cpu_values, cpu)[0];
- return res;
+ return per_cpu_ptr(self->per_cpu_values, cpu)[0];
}
-EXPORT_SYMBOL_GPL(pcounter_def_getval);
+int pcounter_getval(const struct pcounter *self)
+{
+ int res = 0, cpu;
+
+ for_each_possible_cpu(cpu)
+ res += self->getval(self, cpu);
+
+ return res;
+}
+EXPORT_SYMBOL_GPL(pcounter_getval);
+
+int pcounter_alloc(struct pcounter *self)
+{
+ int rc = 0;
+ if (self->add == NULL) {
+ self->per_cpu_values = alloc_percpu(int);
+ if (self->per_cpu_values != NULL) {
+ self->add = pcounter_dyn_add;
+ self->getval = pcounter_dyn_getval;
+ } else
+ rc = 1;
+ }
+ return rc;
+}
+EXPORT_SYMBOL_GPL(pcounter_alloc);
+
+void pcounter_free(struct pcounter *self)
+{
+ if (self->per_cpu_values != NULL) {
+ free_percpu(self->per_cpu_values);
+ self->per_cpu_values = NULL;
+ self->getval = NULL;
+ self->add = NULL;
+ }
+}
+EXPORT_SYMBOL_GPL(pcounter_free);
+