diff options
| author | Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com> | 2014-06-16 19:37:05 +0300 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2014-06-19 15:49:24 -0400 |
| commit | 7c0acf868d2e470c9d6a40091acf8d6444c01b57 (patch) | |
| tree | 20b89ce3af714877c6444a41b9a036c919e75265 /drivers/net/wireless/ath/wil6210/debugfs.c | |
| parent | 67c3e1b41efe4dd400f444c6dccc4538b627758c (diff) | |
wil6210: Tx performance monitoring
For performance monitoring, trace time intervals when Tx vring
is idle/not idle. Use CPU cycle counter for this, because jiffies is
too rough, and other precise time measurement methods involve
overhead while get_cycles() should be fast.
This used to provide some estimation for percentage when Tx vring
was idle, i.e. when hardware is under-utilized.
Estimation is not precise because of many reasons - CPU frequency scaling,
grt_cycles() may be per core etc. But still, it is good estimation
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/ath/wil6210/debugfs.c')
| -rw-r--r-- | drivers/net/wireless/ath/wil6210/debugfs.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/net/wireless/ath/wil6210/debugfs.c b/drivers/net/wireless/ath/wil6210/debugfs.c index d90aa28ec7bd1..9c1102304b938 100644 --- a/drivers/net/wireless/ath/wil6210/debugfs.c +++ b/drivers/net/wireless/ath/wil6210/debugfs.c @@ -69,6 +69,8 @@ static int wil_vring_debugfs_show(struct seq_file *s, void *data) for (i = 0; i < ARRAY_SIZE(wil->vring_tx); i++) { struct vring *vring = &(wil->vring_tx[i]); + struct vring_tx_data *txdata = &wil->vring_tx_data[i]; + if (vring->va) { int cid = wil->vring2cid_tid[i][0]; int tid = wil->vring2cid_tid[i][1]; @@ -78,10 +80,20 @@ static int wil_vring_debugfs_show(struct seq_file *s, void *data) % vring->size; int avail = vring->size - used - 1; char name[10]; + /* performance monitoring */ + cycles_t now = get_cycles(); + cycles_t idle = txdata->idle; + cycles_t total = now - txdata->begin; + + txdata->begin = now; + txdata->idle = 0ULL; + snprintf(name, sizeof(name), "tx_%2d", i); - seq_printf(s, "\n%pM CID %d TID %d [%3d|%3d]\n", - wil->sta[cid].addr, cid, tid, used, avail); + seq_printf(s, "\n%pM CID %d TID %d [%3d|%3d] idle %3d%%\n", + wil->sta[cid].addr, cid, tid, used, avail, + (int)((idle*100)/total)); + wil_print_vring(s, wil, name, vring, '_', 'H'); } } |