dmatest: add basic performance metrics
Add iops and throughput to the summary output.
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index d07b732..26b5020 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -325,6 +325,29 @@
current->comm, n, err, src_off, dst_off, len, data);
}
+static unsigned long long dmatest_persec(s64 runtime, unsigned int val)
+{
+ unsigned long long per_sec = 1000000;
+
+ if (runtime <= 0)
+ return 0;
+
+ /* drop precision until runtime is 32-bits */
+ while (runtime > UINT_MAX) {
+ runtime >>= 1;
+ per_sec <<= 1;
+ }
+
+ per_sec *= val;
+ do_div(per_sec, runtime);
+ return per_sec;
+}
+
+static unsigned long long dmatest_KBs(s64 runtime, unsigned long long len)
+{
+ return dmatest_persec(runtime, len >> 10);
+}
+
/*
* This function repeatedly tests DMA transfers of various lengths and
* offsets for a given operation type until it is told to exit by
@@ -360,6 +383,9 @@
int src_cnt;
int dst_cnt;
int i;
+ ktime_t ktime;
+ s64 runtime = 0;
+ unsigned long long total_len = 0;
set_freezable();
@@ -417,6 +443,7 @@
*/
flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
+ ktime = ktime_get();
while (!kthread_should_stop()
&& !(params->iterations && total_tests >= params->iterations)) {
struct dma_async_tx_descriptor *tx = NULL;
@@ -464,6 +491,7 @@
len = (len >> align) << align;
if (!len)
len = 1 << align;
+ total_len += len;
for (i = 0; i < src_cnt; i++) {
u8 *buf = thread->srcs[i] + src_off;
@@ -607,6 +635,7 @@
len, 0);
}
}
+ runtime = ktime_us_delta(ktime_get(), ktime);
ret = 0;
for (i = 0; thread->dsts[i]; i++)
@@ -621,8 +650,10 @@
err_srcs:
kfree(pq_coefs);
err_thread_type:
- pr_info("%s: terminating after %u tests, %u failures (status %d)\n",
- current->comm, total_tests, failed_tests, ret);
+ pr_info("%s: summary %u tests, %u failures %llu iops %llu KB/s (%d)\n",
+ current->comm, total_tests, failed_tests,
+ dmatest_persec(runtime, total_tests),
+ dmatest_KBs(runtime, total_len), ret);
/* terminate all transfers on specified channels */
if (ret)