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wil6210: Tx performance monitoring

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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>
This commit is contained in:
Vladimir Kondratiev
2014-06-16 19:37:05 +03:00
committed by John W. Linville
parent 67c3e1b41e
commit 7c0acf868d
3 changed files with 23 additions and 4 deletions
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16
drivers/net/wireless/ath/wil6210/debugfs.c
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@@ -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');
}
}