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authorEric Dumazet <eric.dumazet@gmail.com>2010-05-06 22:07:48 -0700
committerDavid S. Miller <davem@davemloft.net>2010-05-06 22:07:48 -0700
commiteecfd7c4e36ff532d895885971d01d049bd3e014 (patch)
treef75ee9904f29f9fd8d5a019766e41d3c07066903
parent39e0786d3cf39c6d2f47b4818ae2da8b8ebc9ce2 (diff)
downloadblackbird-op-linux-eecfd7c4e36ff532d895885971d01d049bd3e014.tar.gz
blackbird-op-linux-eecfd7c4e36ff532d895885971d01d049bd3e014.zip
rps: Various optimizations
Introduce ____napi_schedule() helper for callers in irq disabled contexts. rps_trigger_softirq() becomes a leaf function. Use container_of() in process_backlog() instead of accessing per_cpu address. Use a custom inlined version of __napi_complete() in process_backlog() to avoid one locked instruction : only current cpu owns and manipulates this napi, and NAPI_STATE_SCHED is the only possible flag set on backlog. we can use a plain write instead of clear_bit(), and we dont need an smp_mb() memory barrier, since RPS is on, backlog is protected by a spinlock. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/core/dev.c28
1 files changed, 22 insertions, 6 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 36d53be4fca6..32611c8f1219 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2205,6 +2205,14 @@ int netdev_max_backlog __read_mostly = 1000;
int netdev_budget __read_mostly = 300;
int weight_p __read_mostly = 64; /* old backlog weight */
+/* Called with irq disabled */
+static inline void ____napi_schedule(struct softnet_data *sd,
+ struct napi_struct *napi)
+{
+ list_add_tail(&napi->poll_list, &sd->poll_list);
+ __raise_softirq_irqoff(NET_RX_SOFTIRQ);
+}
+
#ifdef CONFIG_RPS
/* One global table that all flow-based protocols share. */
@@ -2363,7 +2371,7 @@ static void rps_trigger_softirq(void *data)
{
struct softnet_data *sd = data;
- __napi_schedule(&sd->backlog);
+ ____napi_schedule(sd, &sd->backlog);
sd->received_rps++;
}
@@ -2421,7 +2429,7 @@ enqueue:
/* Schedule NAPI for backlog device */
if (napi_schedule_prep(&sd->backlog)) {
if (!rps_ipi_queued(sd))
- __napi_schedule(&sd->backlog);
+ ____napi_schedule(sd, &sd->backlog);
}
goto enqueue;
}
@@ -3280,7 +3288,7 @@ static void net_rps_action_and_irq_enable(struct softnet_data *sd)
static int process_backlog(struct napi_struct *napi, int quota)
{
int work = 0;
- struct softnet_data *sd = &__get_cpu_var(softnet_data);
+ struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
#ifdef CONFIG_RPS
/* Check if we have pending ipi, its better to send them now,
@@ -3313,7 +3321,16 @@ static int process_backlog(struct napi_struct *napi, int quota)
&sd->process_queue);
}
if (qlen < quota - work) {
- __napi_complete(napi);
+ /*
+ * Inline a custom version of __napi_complete().
+ * only current cpu owns and manipulates this napi,
+ * and NAPI_STATE_SCHED is the only possible flag set on backlog.
+ * we can use a plain write instead of clear_bit(),
+ * and we dont need an smp_mb() memory barrier.
+ */
+ list_del(&napi->poll_list);
+ napi->state = 0;
+
quota = work + qlen;
}
rps_unlock(sd);
@@ -3334,8 +3351,7 @@ void __napi_schedule(struct napi_struct *n)
unsigned long flags;
local_irq_save(flags);
- list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
- __raise_softirq_irqoff(NET_RX_SOFTIRQ);
+ ____napi_schedule(&__get_cpu_var(softnet_data), n);
local_irq_restore(flags);
}
EXPORT_SYMBOL(__napi_schedule);
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