* [dpdk-dev] [PATCH] event/octeontx2: use c11 atomics for statistics
@ 2020-03-27 8:55 pbhagavatula
2020-03-30 6:25 ` Phil Yang
0 siblings, 1 reply; 3+ messages in thread
From: pbhagavatula @ 2020-03-27 8:55 UTC (permalink / raw)
To: jerinj, Honnappa.Nagarahalli, Phil.Yang, Pavan Nikhilesh; +Cc: dev
From: Pavan Nikhilesh <pbhagavatula@marvell.com>
Use c11 atomics with RELAXED ordering instead of rte_atomic ops which
enforce unnessary barries on arm64.
Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
---
drivers/event/octeontx2/otx2_tim_evdev.c | 5 +++--
drivers/event/octeontx2/otx2_tim_evdev.h | 2 +-
drivers/event/octeontx2/otx2_tim_worker.c | 5 +++--
3 files changed, 7 insertions(+), 5 deletions(-)
diff --git a/drivers/event/octeontx2/otx2_tim_evdev.c b/drivers/event/octeontx2/otx2_tim_evdev.c
index cd0dcde24..4c24cc8a6 100644
--- a/drivers/event/octeontx2/otx2_tim_evdev.c
+++ b/drivers/event/octeontx2/otx2_tim_evdev.c
@@ -526,7 +526,8 @@ otx2_tim_stats_get(const struct rte_event_timer_adapter *adapter,
uint64_t bkt_cyc = rte_rdtsc() - tim_ring->ring_start_cyc;
- stats->evtim_exp_count = rte_atomic64_read(&tim_ring->arm_cnt);
+ stats->evtim_exp_count = __atomic_load_n(&tim_ring->arm_cnt,
+ __ATOMIC_RELAXED);
stats->ev_enq_count = stats->evtim_exp_count;
stats->adapter_tick_count = rte_reciprocal_divide_u64(bkt_cyc,
&tim_ring->fast_div);
@@ -538,7 +539,7 @@ otx2_tim_stats_reset(const struct rte_event_timer_adapter *adapter)
{
struct otx2_tim_ring *tim_ring = adapter->data->adapter_priv;
- rte_atomic64_clear(&tim_ring->arm_cnt);
+ __atomic_store_n(&tim_ring->arm_cnt, 0, __ATOMIC_RELAXED);
return 0;
}
diff --git a/drivers/event/octeontx2/otx2_tim_evdev.h b/drivers/event/octeontx2/otx2_tim_evdev.h
index 56895dcbf..44e3c7b51 100644
--- a/drivers/event/octeontx2/otx2_tim_evdev.h
+++ b/drivers/event/octeontx2/otx2_tim_evdev.h
@@ -149,7 +149,7 @@ struct otx2_tim_ring {
struct otx2_tim_bkt *bkt;
struct rte_mempool *chunk_pool;
struct rte_reciprocal_u64 fast_div;
- rte_atomic64_t arm_cnt;
+ uint64_t arm_cnt;
uint8_t prod_type_sp;
uint8_t enable_stats;
uint8_t disable_npa;
diff --git a/drivers/event/octeontx2/otx2_tim_worker.c b/drivers/event/octeontx2/otx2_tim_worker.c
index 104674c79..4b5cfdc72 100644
--- a/drivers/event/octeontx2/otx2_tim_worker.c
+++ b/drivers/event/octeontx2/otx2_tim_worker.c
@@ -88,7 +88,7 @@ tim_timer_arm_burst(const struct rte_event_timer_adapter *adptr,
}
if (flags & OTX2_TIM_ENA_STATS)
- rte_atomic64_add(&tim_ring->arm_cnt, index);
+ __atomic_fetch_add(&tim_ring->arm_cnt, index, __ATOMIC_RELAXED);
return index;
}
@@ -130,7 +130,8 @@ tim_timer_arm_tmo_brst(const struct rte_event_timer_adapter *adptr,
break;
}
if (flags & OTX2_TIM_ENA_STATS)
- rte_atomic64_add(&tim_ring->arm_cnt, set_timers);
+ __atomic_fetch_add(&tim_ring->arm_cnt, set_timers,
+ __ATOMIC_RELAXED);
return set_timers;
}
--
2.17.1
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [dpdk-dev] [PATCH] event/octeontx2: use c11 atomics for statistics
2020-03-27 8:55 [dpdk-dev] [PATCH] event/octeontx2: use c11 atomics for statistics pbhagavatula
@ 2020-03-30 6:25 ` Phil Yang
2020-04-04 16:39 ` Jerin Jacob
0 siblings, 1 reply; 3+ messages in thread
From: Phil Yang @ 2020-03-30 6:25 UTC (permalink / raw)
To: pbhagavatula, jerinj, Honnappa Nagarahalli; +Cc: dev, nd, nd
> -----Original Message-----
> From: pbhagavatula@marvell.com <pbhagavatula@marvell.com>
> Sent: Friday, March 27, 2020 4:56 PM
> To: jerinj@marvell.com; Honnappa Nagarahalli
> <Honnappa.Nagarahalli@arm.com>; Phil Yang <Phil.Yang@arm.com>; Pavan
> Nikhilesh <pbhagavatula@marvell.com>
> Cc: dev@dpdk.org
> Subject: [dpdk-dev] [PATCH] event/octeontx2: use c11 atomics for statistics
>
> From: Pavan Nikhilesh <pbhagavatula@marvell.com>
>
> Use c11 atomics with RELAXED ordering instead of rte_atomic ops which
> enforce unnessary barries on arm64.
>
> Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
> ---
> drivers/event/octeontx2/otx2_tim_evdev.c | 5 +++--
> drivers/event/octeontx2/otx2_tim_evdev.h | 2 +-
> drivers/event/octeontx2/otx2_tim_worker.c | 5 +++--
> 3 files changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/event/octeontx2/otx2_tim_evdev.c
> b/drivers/event/octeontx2/otx2_tim_evdev.c
> index cd0dcde24..4c24cc8a6 100644
> --- a/drivers/event/octeontx2/otx2_tim_evdev.c
> +++ b/drivers/event/octeontx2/otx2_tim_evdev.c
> @@ -526,7 +526,8 @@ otx2_tim_stats_get(const struct
> rte_event_timer_adapter *adapter,
> uint64_t bkt_cyc = rte_rdtsc() - tim_ring->ring_start_cyc;
>
>
> - stats->evtim_exp_count = rte_atomic64_read(&tim_ring->arm_cnt);
> + stats->evtim_exp_count = __atomic_load_n(&tim_ring->arm_cnt,
> + __ATOMIC_RELAXED);
> stats->ev_enq_count = stats->evtim_exp_count;
> stats->adapter_tick_count = rte_reciprocal_divide_u64(bkt_cyc,
> &tim_ring->fast_div);
> @@ -538,7 +539,7 @@ otx2_tim_stats_reset(const struct
> rte_event_timer_adapter *adapter)
> {
> struct otx2_tim_ring *tim_ring = adapter->data->adapter_priv;
>
> - rte_atomic64_clear(&tim_ring->arm_cnt);
> + __atomic_store_n(&tim_ring->arm_cnt, 0, __ATOMIC_RELAXED);
Both otx2_tim_stats_get & otx2_tim_stats_reset operations are handled in the same thread,
and the arm_cmn read & store operations are sequential consistent in this case.
So RELAXED memory ordering here is enough.
> return 0;
> }
>
> diff --git a/drivers/event/octeontx2/otx2_tim_evdev.h
> b/drivers/event/octeontx2/otx2_tim_evdev.h
> index 56895dcbf..44e3c7b51 100644
> --- a/drivers/event/octeontx2/otx2_tim_evdev.h
> +++ b/drivers/event/octeontx2/otx2_tim_evdev.h
> @@ -149,7 +149,7 @@ struct otx2_tim_ring {
> struct otx2_tim_bkt *bkt;
> struct rte_mempool *chunk_pool;
> struct rte_reciprocal_u64 fast_div;
> - rte_atomic64_t arm_cnt;
> + uint64_t arm_cnt;
> uint8_t prod_type_sp;
> uint8_t enable_stats;
> uint8_t disable_npa;
> diff --git a/drivers/event/octeontx2/otx2_tim_worker.c
> b/drivers/event/octeontx2/otx2_tim_worker.c
> index 104674c79..4b5cfdc72 100644
> --- a/drivers/event/octeontx2/otx2_tim_worker.c
> +++ b/drivers/event/octeontx2/otx2_tim_worker.c
> @@ -88,7 +88,7 @@ tim_timer_arm_burst(const struct
> rte_event_timer_adapter *adptr,
> }
>
> if (flags & OTX2_TIM_ENA_STATS)
> - rte_atomic64_add(&tim_ring->arm_cnt, index);
> + __atomic_fetch_add(&tim_ring->arm_cnt, index,
> __ATOMIC_RELAXED);
>
> return index;
> }
> @@ -130,7 +130,8 @@ tim_timer_arm_tmo_brst(const struct
> rte_event_timer_adapter *adptr,
> break;
> }
> if (flags & OTX2_TIM_ENA_STATS)
> - rte_atomic64_add(&tim_ring->arm_cnt, set_timers);
> + __atomic_fetch_add(&tim_ring->arm_cnt, set_timers,
> + __ATOMIC_RELAXED);
>
> return set_timers;
> }
> --
> 2.17.1
It goods good to me.
Reviewed-by: Phil Yang <phil.yang@arm.com>
Thanks,
Phil
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [dpdk-dev] [PATCH] event/octeontx2: use c11 atomics for statistics
2020-03-30 6:25 ` Phil Yang
@ 2020-04-04 16:39 ` Jerin Jacob
0 siblings, 0 replies; 3+ messages in thread
From: Jerin Jacob @ 2020-04-04 16:39 UTC (permalink / raw)
To: Phil Yang; +Cc: pbhagavatula, jerinj, Honnappa Nagarahalli, dev, nd
On Mon, Mar 30, 2020 at 11:56 AM Phil Yang <Phil.Yang@arm.com> wrote:
> > if (flags & OTX2_TIM_ENA_STATS)
> > - rte_atomic64_add(&tim_ring->arm_cnt, index);
> > + __atomic_fetch_add(&tim_ring->arm_cnt, index,
> > __ATOMIC_RELAXED);
> >
> > return index;
> > }
> > @@ -130,7 +130,8 @@ tim_timer_arm_tmo_brst(const struct
> > rte_event_timer_adapter *adptr,
> > break;
> > }
> > if (flags & OTX2_TIM_ENA_STATS)
> > - rte_atomic64_add(&tim_ring->arm_cnt, set_timers);
> > + __atomic_fetch_add(&tim_ring->arm_cnt, set_timers,
> > + __ATOMIC_RELAXED);
> >
> > return set_timers;
> > }
> > --
> > 2.17.1
>
> It goods good to me.
>
> Reviewed-by: Phil Yang <phil.yang@arm.com>
Applied to dpdk-next-eventdev/master. Thanks.
>
> Thanks,
> Phil
^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-03-30 6:25 ` Phil Yang
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