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Date: Thu, 1 Sep 2016 10:02:55 -0400 From: Sinan Kaya <okaya@...eaurora.org> To: dmaengine@...r.kernel.org, timur@...eaurora.org, cov@...eaurora.org Cc: linux-arm-msm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, Sinan Kaya <okaya@...eaurora.org>, linux-kernel@...r.kernel.org Subject: [PATCH V3] dmaengine: dmatest: exclude compare and fill time during perf report Dmatest is currently including compare and fill time into the calculated performance numbers. This does not reflect the HW capability and the results vary based on the CPU speed instead of the HW speed. Signed-off-by: Sinan Kaya <okaya@...eaurora.org> --- drivers/dma/dmatest.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c index 1245db5..738fbd1 100644 --- a/drivers/dma/dmatest.c +++ b/drivers/dma/dmatest.c @@ -426,7 +426,9 @@ static int dmatest_func(void *data) int src_cnt; int dst_cnt; int i; - ktime_t ktime; + ktime_t ktime, start, diff; + ktime_t filltime = ktime_set(0, 0); + ktime_t comparetime = ktime_set(0, 0); s64 runtime = 0; unsigned long long total_len = 0; @@ -531,6 +533,7 @@ static int dmatest_func(void *data) src_off = 0; dst_off = 0; } else { + start = ktime_get(); src_off = dmatest_random() % (params->buf_size - len + 1); dst_off = dmatest_random() % (params->buf_size - len + 1); @@ -541,6 +544,9 @@ static int dmatest_func(void *data) params->buf_size); dmatest_init_dsts(thread->dsts, dst_off, len, params->buf_size); + + diff = ktime_sub(ktime_get(), start); + filltime = ktime_add(filltime, diff); } um = dmaengine_get_unmap_data(dev->dev, src_cnt+dst_cnt, @@ -683,6 +689,7 @@ static int dmatest_func(void *data) continue; } + start = ktime_get(); pr_debug("%s: verifying source buffer...\n", current->comm); error_count = dmatest_verify(thread->srcs, 0, src_off, 0, PATTERN_SRC, true); @@ -703,6 +710,9 @@ static int dmatest_func(void *data) params->buf_size, dst_off + len, PATTERN_DST, false); + diff = ktime_sub(ktime_get(), start); + comparetime = ktime_add(comparetime, diff); + if (error_count) { result("data error", total_tests, src_off, dst_off, len, error_count); @@ -712,7 +722,10 @@ static int dmatest_func(void *data) dst_off, len, 0); } } - runtime = ktime_us_delta(ktime_get(), ktime); + ktime = ktime_sub(ktime_get(), ktime); + ktime = ktime_sub(ktime, comparetime); + ktime = ktime_sub(ktime, filltime); + runtime = ktime_to_us(ktime); ret = 0; err_dstbuf: -- 1.9.1
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