diff options
author | Greg Kroah-Hartman <gregkh@google.com> | 2016-02-17 16:30:38 -0800 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@google.com> | 2016-02-17 16:30:38 -0800 |
commit | 2422d36696f36ea92f17bb34a129a74f9b173891 (patch) | |
tree | 0eb597e9af0eadb0672a0556d5e2d2081a3f4e53 | |
parent | b07868bda2fb61b784dc260dd075d84ac994d599 (diff) |
greybus: Revert "gb_loopback: Fix throughput calculations"
This reverts commit 9b9b046af237f5674c2f7ca991dc62332b2d4041
Bryan wants more feedback first.
Reported-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
-rw-r--r-- | drivers/staging/greybus/loopback.c | 57 |
1 files changed, 15 insertions, 42 deletions
diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c index c022edbfb135..f3ae2e9fc1bb 100644 --- a/drivers/staging/greybus/loopback.c +++ b/drivers/staging/greybus/loopback.c @@ -81,7 +81,6 @@ struct gb_loopback { atomic_t outstanding_operations; /* Per connection stats */ - struct timeval ts; struct gb_loopback_stats latency; struct gb_loopback_stats throughput; struct gb_loopback_stats requests_per_second; @@ -521,6 +520,7 @@ static void gb_loopback_async_operation_callback(struct gb_operation *operation) gb_loopback_push_latency_ts(gb, &op_async->ts, &te); gb->elapsed_nsecs = gb_loopback_calc_latency(&op_async->ts, &te); + gb_loopback_calculate_stats(gb); } if (op_async->pending) { @@ -529,7 +529,6 @@ static void gb_loopback_async_operation_callback(struct gb_operation *operation) del_timer_sync(&op_async->timer); gb_loopback_async_operation_put(op_async); } - gb_loopback_calculate_stats(gb); mutex_unlock(&gb->mutex); dev_dbg(&gb->connection->bundle->dev, "complete operation %d\n", @@ -847,7 +846,6 @@ static void gb_loopback_reset_stats(struct gb_loopback *gb) /* Should be initialized at least once per transaction set */ gb->apbridge_latency_ts = 0; gb->gpbridge_latency_ts = 0; - memset(&gb->ts, 0, sizeof(struct timeval)); } static void gb_loopback_update_stats(struct gb_loopback_stats *stats, u32 val) @@ -862,15 +860,15 @@ static void gb_loopback_update_stats(struct gb_loopback_stats *stats, u32 val) static void gb_loopback_requests_update(struct gb_loopback *gb, u32 latency) { - u64 req = gb->requests_completed * USEC_PER_SEC; + u32 req = USEC_PER_SEC; do_div(req, latency); - gb_loopback_update_stats(&gb->requests_per_second, (u32)req); + gb_loopback_update_stats(&gb->requests_per_second, req); } static void gb_loopback_throughput_update(struct gb_loopback *gb, u32 latency) { - u64 throughput; + u32 throughput; u32 aggregate_size = sizeof(struct gb_operation_msg_hdr) * 2; switch (gb->type) { @@ -889,13 +887,14 @@ static void gb_loopback_throughput_update(struct gb_loopback *gb, u32 latency) return; } - aggregate_size *= gb->requests_completed; - throughput = aggregate_size * USEC_PER_SEC; + /* Calculate bytes per second */ + throughput = USEC_PER_SEC; do_div(throughput, latency); - gb_loopback_update_stats(&gb->throughput, (u32)throughput); + throughput *= aggregate_size; + gb_loopback_update_stats(&gb->throughput, throughput); } -static void gb_loopback_calculate_latency_stats(struct gb_loopback *gb) +static void gb_loopback_calculate_stats(struct gb_loopback *gb) { u32 lat; @@ -908,6 +907,10 @@ static void gb_loopback_calculate_latency_stats(struct gb_loopback *gb) /* Raw latency log on a per thread basis */ kfifo_in(&gb->kfifo_lat, (unsigned char *)&lat, sizeof(lat)); + /* Log throughput and requests using latency as benchmark */ + gb_loopback_throughput_update(gb, lat); + gb_loopback_requests_update(gb, lat); + /* Log the firmware supplied latency values */ gb_loopback_update_stats(&gb->apbridge_unipro_latency, gb->apbridge_latency_ts); @@ -915,27 +918,6 @@ static void gb_loopback_calculate_latency_stats(struct gb_loopback *gb) gb->gpbridge_latency_ts); } -static void gb_loopback_calculate_stats(struct gb_loopback *gb) -{ - u64 nlat; - u32 lat; - struct timeval te; - - gb_loopback_calculate_latency_stats(gb); - - if (gb->iteration_count == gb->iteration_max) { - do_gettimeofday(&te); - nlat = gb_loopback_calc_latency(&gb->ts, &te); - lat = gb_loopback_nsec_to_usec_latency(nlat); - - gb_loopback_throughput_update(gb, lat); - gb_loopback_requests_update(gb, lat); - - memset(&gb->ts, 0, sizeof(struct timeval)); - gb->type = 0; - } -} - static void gb_loopback_async_wait_to_send(struct gb_loopback *gb) { if (!(gb->async && gb->outstanding_operations_max)) @@ -973,10 +955,8 @@ static int gb_loopback_fn(void *data) /* Optionally terminate */ if (send_count == gb->iteration_max) { - if (!gb->async) - send_count = 0; - else if (gb->iteration_count == gb->iteration_max) - send_count = 0; + gb->type = 0; + send_count = 0; mutex_unlock(&gb->mutex); continue; } @@ -985,15 +965,10 @@ static int gb_loopback_fn(void *data) type = gb->type; mutex_unlock(&gb->mutex); - if (gb->ts.tv_usec == 0 && gb->ts.tv_sec == 0) - do_gettimeofday(&gb->ts); - /* Else operations to perform */ if (gb->async) { if (type == GB_LOOPBACK_TYPE_PING) { error = gb_loopback_async_ping(gb); - if (!error) - gb->requests_completed++; gb_loopback_calculate_stats(gb); } else if (type == GB_LOOPBACK_TYPE_TRANSFER) { error = gb_loopback_async_transfer(gb, size); @@ -1014,8 +989,6 @@ static int gb_loopback_fn(void *data) if (error) gb->error++; - else - gb->requests_completed++; gb->iteration_count++; gb_loopback_calculate_stats(gb); } |