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>
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@ -77,5 +77,9 @@ the parens represents additional information, e.g. error code, error counter,
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or status. A test thread also emits a summary line at completion listing the
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number of tests executed, number that failed, and a result code.
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Example:
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% dmesg | tail -n 1
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dmatest: dma3chan0-copy0: summary 400000 tests, 0 failures iops: 61524 KB/s 246098 (0)
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The details of a data miscompare error are also emitted, but do not follow the
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above format.
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@ -325,6 +325,29 @@ static void dbg_result(const char *err, unsigned int n, unsigned int src_off,
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current->comm, n, err, src_off, dst_off, len, data);
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}
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static unsigned long long dmatest_persec(s64 runtime, unsigned int val)
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{
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unsigned long long per_sec = 1000000;
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if (runtime <= 0)
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return 0;
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/* drop precision until runtime is 32-bits */
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while (runtime > UINT_MAX) {
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runtime >>= 1;
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per_sec <<= 1;
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}
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per_sec *= val;
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do_div(per_sec, runtime);
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return per_sec;
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}
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static unsigned long long dmatest_KBs(s64 runtime, unsigned long long len)
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{
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return dmatest_persec(runtime, len >> 10);
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}
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/*
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* This function repeatedly tests DMA transfers of various lengths and
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* offsets for a given operation type until it is told to exit by
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@ -360,6 +383,9 @@ static int dmatest_func(void *data)
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int src_cnt;
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int dst_cnt;
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int i;
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ktime_t ktime;
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s64 runtime = 0;
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unsigned long long total_len = 0;
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set_freezable();
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@ -417,6 +443,7 @@ static int dmatest_func(void *data)
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*/
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flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
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ktime = ktime_get();
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while (!kthread_should_stop()
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&& !(params->iterations && total_tests >= params->iterations)) {
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struct dma_async_tx_descriptor *tx = NULL;
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@ -464,6 +491,7 @@ static int dmatest_func(void *data)
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len = (len >> align) << align;
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if (!len)
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len = 1 << align;
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total_len += len;
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for (i = 0; i < src_cnt; i++) {
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u8 *buf = thread->srcs[i] + src_off;
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@ -607,6 +635,7 @@ static int dmatest_func(void *data)
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len, 0);
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}
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}
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runtime = ktime_us_delta(ktime_get(), ktime);
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ret = 0;
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for (i = 0; thread->dsts[i]; i++)
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@ -621,8 +650,10 @@ err_srcbuf:
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err_srcs:
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kfree(pq_coefs);
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err_thread_type:
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pr_info("%s: terminating after %u tests, %u failures (status %d)\n",
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current->comm, total_tests, failed_tests, ret);
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pr_info("%s: summary %u tests, %u failures %llu iops %llu KB/s (%d)\n",
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current->comm, total_tests, failed_tests,
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dmatest_persec(runtime, total_tests),
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dmatest_KBs(runtime, total_len), ret);
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/* terminate all transfers on specified channels */
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if (ret)
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