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ntb_perf: Return results by reading the run file 

Instead of having to watch logs, allow the results to be retrieved
by reading back the run file. This file will return "running" when
the test is running and nothing if no tests have been run yet.
It returns 1 line per thread, and will display an error message if the
corresponding thread returns an error.

With the above change, the pr_info calls that returned the results are
then changed to pr_debug calls.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Logan Gunthorpe 2016-06-20 13:15:06 -06:00 committed by Jon Mason
parent da573eaa3a
commit 58fd0f3b15
1 changed files with 55 additions and 12 deletions
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67
drivers/ntb/test/ntb_perf.c
View File

@ -123,6 +123,9 @@ struct pthr_ctx {
int src_idx;
void *srcs[MAX_SRCS];
wait_queue_head_t *wq;
int status;
u64 copied;
u64 diff_us;
};
struct perf_ctx {
@ -305,7 +308,7 @@ static int perf_move_data(struct pthr_ctx *pctx, char __iomem *dst, char *src,
}
if (use_dma) {
pr_info("%s: All DMA descriptors submitted\n", current->comm);
pr_debug("%s: All DMA descriptors submitted\n", current->comm);
while (atomic_read(&pctx->dma_sync) != 0) {
if (kthread_should_stop())
break;
@ -317,13 +320,16 @@ static int perf_move_data(struct pthr_ctx *pctx, char __iomem *dst, char *src,
kdiff = ktime_sub(kstop, kstart);
diff_us = ktime_to_us(kdiff);
pr_info("%s: copied %llu bytes\n", current->comm, copied);
pr_debug("%s: copied %llu bytes\n", current->comm, copied);
pr_info("%s: lasted %llu usecs\n", current->comm, diff_us);
pr_debug("%s: lasted %llu usecs\n", current->comm, diff_us);
perf = div64_u64(copied, diff_us);
pr_info("%s: MBytes/s: %llu\n", current->comm, perf);
pr_debug("%s: MBytes/s: %llu\n", current->comm, perf);
pctx->copied = copied;
pctx->diff_us = diff_us;
return 0;
}
@ -345,7 +351,7 @@ static int ntb_perf_thread(void *data)
int rc, node, i;
struct dma_chan *dma_chan = NULL;
pr_info("kthread %s starting...\n", current->comm);
pr_debug("kthread %s starting...\n", current->comm);
node = dev_to_node(&pdev->dev);
@ -575,19 +581,44 @@ static ssize_t debugfs_run_read(struct file *filp, char __user *ubuf,
{
struct perf_ctx *perf = filp->private_data;
char *buf;
ssize_t ret, out_offset;
int running;
ssize_t ret, out_off = 0;
struct pthr_ctx *pctx;
int i;
u64 rate;
if (!perf)
return 0;
buf = kmalloc(64, GFP_KERNEL);
buf = kmalloc(1024, GFP_KERNEL);
if (!buf)
return -ENOMEM;
running = mutex_is_locked(&perf->run_mutex);
out_offset = snprintf(buf, 64, "%d\n", running);
ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset);
if (mutex_is_locked(&perf->run_mutex)) {
out_off = snprintf(buf, 64, "running\n");
goto read_from_buf;
}
for (i = 0; i < MAX_THREADS; i++) {
pctx = &perf->pthr_ctx[i];
if (pctx->status == -ENODATA)
break;
if (pctx->status) {
out_off += snprintf(buf + out_off, 1024 - out_off,
"%d: error %d\n", i,
pctx->status);
continue;
}
rate = div64_u64(pctx->copied, pctx->diff_us);
out_off += snprintf(buf + out_off, 1024 - out_off,
"%d: copied %llu bytes in %llu usecs, %llu MBytes/s\n",
i, pctx->copied, pctx->diff_us, rate);
}
read_from_buf:
ret = simple_read_from_buffer(ubuf, count, offp, buf, out_off);
kfree(buf);
return ret;
@ -601,12 +632,20 @@ static void threads_cleanup(struct perf_ctx *perf)
for (i = 0; i < MAX_THREADS; i++) {
pctx = &perf->pthr_ctx[i];
if (pctx->thread) {
kthread_stop(pctx->thread);
pctx->status = kthread_stop(pctx->thread);
pctx->thread = NULL;
}
}
}
static void perf_clear_thread_status(struct perf_ctx *perf)
{
int i;
for (i = 0; i < MAX_THREADS; i++)
perf->pthr_ctx[i].status = -ENODATA;
}
static ssize_t debugfs_run_write(struct file *filp, const char __user *ubuf,
size_t count, loff_t *offp)
{
@ -623,6 +662,8 @@ static ssize_t debugfs_run_write(struct file *filp, const char __user *ubuf,
if (!mutex_trylock(&perf->run_mutex))
return -EBUSY;
perf_clear_thread_status(perf);
if (perf->perf_threads > MAX_THREADS) {
perf->perf_threads = MAX_THREADS;
pr_info("Reset total threads to: %u\n", MAX_THREADS);
@ -757,6 +798,8 @@ static int perf_probe(struct ntb_client *client, struct ntb_dev *ntb)
if (rc)
goto err_ctx;
perf_clear_thread_status(perf);
return 0;
err_ctx: