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authorDan Williams <dan.j.williams@intel.com>2013-11-06 16:30:07 -0800
committerDan Williams <dan.j.williams@intel.com>2013-11-14 11:04:40 -0800
commit86727443a04fdb25397041188efd2527f2b7237b (patch)
tree0f3f19ad4946cb63607c2576add482133d311e9b
parente3b9c347316fe243bea6abd08681050c43ca22ee (diff)
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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>
-rw-r--r--Documentation/dmatest.txt4
-rw-r--r--drivers/dma/dmatest.c35
2 files changed, 37 insertions, 2 deletions
diff --git a/Documentation/dmatest.txt b/Documentation/dmatest.txt
index e6e16a7f3706..0beb4b68d81f 100644
--- a/Documentation/dmatest.txt
+++ b/Documentation/dmatest.txt
@@ -77,5 +77,9 @@ the parens represents additional information, e.g. error code, error counter,
or status. A test thread also emits a summary line at completion listing the
number of tests executed, number that failed, and a result code.
+Example:
+ % dmesg | tail -n 1
+ dmatest: dma3chan0-copy0: summary 400000 tests, 0 failures iops: 61524 KB/s 246098 (0)
+
The details of a data miscompare error are also emitted, but do not follow the
above format.
diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index d07b73275d0f..26b502069638 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -325,6 +325,29 @@ static void dbg_result(const char *err, unsigned int n, unsigned int src_off,
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 @@ static int dmatest_func(void *data)
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 @@ static int dmatest_func(void *data)
*/
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 @@ static int dmatest_func(void *data)
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 @@ static int dmatest_func(void *data)
len, 0);
}
}
+ runtime = ktime_us_delta(ktime_get(), ktime);
ret = 0;
for (i = 0; thread->dsts[i]; i++)
@@ -621,8 +650,10 @@ err_srcbuf:
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)