From 1109dc392ea0248f7bfca3537011aa7afaa05cee Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Wed, 14 Dec 2016 20:46:58 +0100 Subject: [PATCH] mac80211: minstrel: remove cur_prob from debugfs This field is redundant, because it is simply last success divided by last attempt count. Removing it from the rate stats struct saves about 1.2 KiB per HT station. Signed-off-by: Felix Fietkau Signed-off-by: Johannes Berg --- net/mac80211/rc80211_minstrel.c | 10 ++++++---- net/mac80211/rc80211_minstrel.h | 2 -- net/mac80211/rc80211_minstrel_debugfs.c | 16 ++++++---------- net/mac80211/rc80211_minstrel_ht_debugfs.c | 16 ++++++---------- 4 files changed, 18 insertions(+), 26 deletions(-) diff --git a/net/mac80211/rc80211_minstrel.c b/net/mac80211/rc80211_minstrel.c index 14c5ba3a1b1c..a284ea08f048 100644 --- a/net/mac80211/rc80211_minstrel.c +++ b/net/mac80211/rc80211_minstrel.c @@ -159,21 +159,23 @@ minstrel_update_rates(struct minstrel_priv *mp, struct minstrel_sta_info *mi) void minstrel_calc_rate_stats(struct minstrel_rate_stats *mrs) { + unsigned int cur_prob; + if (unlikely(mrs->attempts > 0)) { mrs->sample_skipped = 0; - mrs->cur_prob = MINSTREL_FRAC(mrs->success, mrs->attempts); + cur_prob = MINSTREL_FRAC(mrs->success, mrs->attempts); if (unlikely(!mrs->att_hist)) { - mrs->prob_ewma = mrs->cur_prob; + mrs->prob_ewma = cur_prob; } else { /* update exponential weighted moving variance */ mrs->prob_ewmsd = minstrel_ewmsd(mrs->prob_ewmsd, - mrs->cur_prob, + cur_prob, mrs->prob_ewma, EWMA_LEVEL); /*update exponential weighted moving avarage */ mrs->prob_ewma = minstrel_ewma(mrs->prob_ewma, - mrs->cur_prob, + cur_prob, EWMA_LEVEL); } mrs->att_hist += mrs->attempts; diff --git a/net/mac80211/rc80211_minstrel.h b/net/mac80211/rc80211_minstrel.h index 209961cbb7e8..94b89b1b406c 100644 --- a/net/mac80211/rc80211_minstrel.h +++ b/net/mac80211/rc80211_minstrel.h @@ -62,10 +62,8 @@ struct minstrel_rate_stats { u32 att_hist, succ_hist; /* statistis of packet delivery probability - * cur_prob - current prob within last update intervall * prob_ewma - exponential weighted moving average of prob * prob_ewmsd - exp. weighted moving standard deviation of prob */ - unsigned int cur_prob; unsigned int prob_ewma; u16 prob_ewmsd; diff --git a/net/mac80211/rc80211_minstrel_debugfs.c b/net/mac80211/rc80211_minstrel_debugfs.c index 820b0abc9c0d..ca0bafd6a44e 100644 --- a/net/mac80211/rc80211_minstrel_debugfs.c +++ b/net/mac80211/rc80211_minstrel_debugfs.c @@ -75,7 +75,7 @@ minstrel_stats_open(struct inode *inode, struct file *file) { struct minstrel_sta_info *mi = inode->i_private; struct minstrel_debugfs_info *ms; - unsigned int i, tp_max, tp_avg, prob, eprob; + unsigned int i, tp_max, tp_avg, eprob; char *p; ms = kmalloc(2048, GFP_KERNEL); @@ -86,9 +86,9 @@ minstrel_stats_open(struct inode *inode, struct file *file) p = ms->buf; p += sprintf(p, "\n"); p += sprintf(p, - "best __________rate_________ ________statistics________ ________last_______ ______sum-of________\n"); + "best __________rate_________ ________statistics________ ____last_____ ______sum-of________\n"); p += sprintf(p, - "rate [name idx airtime max_tp] [avg(tp) avg(prob) sd(prob)] [prob.|retry|suc|att] [#success | #attempts]\n"); + "rate [name idx airtime max_tp] [avg(tp) avg(prob) sd(prob)] [retry|suc|att] [#success | #attempts]\n"); for (i = 0; i < mi->n_rates; i++) { struct minstrel_rate *mr = &mi->r[i]; @@ -107,17 +107,15 @@ minstrel_stats_open(struct inode *inode, struct file *file) tp_max = minstrel_get_tp_avg(mr, MINSTREL_FRAC(100,100)); tp_avg = minstrel_get_tp_avg(mr, mrs->prob_ewma); - prob = MINSTREL_TRUNC(mrs->cur_prob * 1000); eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000); p += sprintf(p, "%4u.%1u %4u.%1u %3u.%1u %3u.%1u" - " %3u.%1u %3u %3u %-3u " + " %3u %3u %-3u " "%9llu %-9llu\n", tp_max / 10, tp_max % 10, tp_avg / 10, tp_avg % 10, eprob / 10, eprob % 10, mrs->prob_ewmsd / 10, mrs->prob_ewmsd % 10, - prob / 10, prob % 10, mrs->retry_count, mrs->last_success, mrs->last_attempts, @@ -148,7 +146,7 @@ minstrel_stats_csv_open(struct inode *inode, struct file *file) { struct minstrel_sta_info *mi = inode->i_private; struct minstrel_debugfs_info *ms; - unsigned int i, tp_max, tp_avg, prob, eprob; + unsigned int i, tp_max, tp_avg, eprob; char *p; ms = kmalloc(2048, GFP_KERNEL); @@ -175,16 +173,14 @@ minstrel_stats_csv_open(struct inode *inode, struct file *file) tp_max = minstrel_get_tp_avg(mr, MINSTREL_FRAC(100,100)); tp_avg = minstrel_get_tp_avg(mr, mrs->prob_ewma); - prob = MINSTREL_TRUNC(mrs->cur_prob * 1000); eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000); - p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u.%u,%u.%u,%u,%u,%u," + p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u.%u,%u,%u,%u," "%llu,%llu,%d,%d\n", tp_max / 10, tp_max % 10, tp_avg / 10, tp_avg % 10, eprob / 10, eprob % 10, mrs->prob_ewmsd / 10, mrs->prob_ewmsd % 10, - prob / 10, prob % 10, mrs->retry_count, mrs->last_success, mrs->last_attempts, diff --git a/net/mac80211/rc80211_minstrel_ht_debugfs.c b/net/mac80211/rc80211_minstrel_ht_debugfs.c index 1942d4b3cd18..0cecd23bb834 100644 --- a/net/mac80211/rc80211_minstrel_ht_debugfs.c +++ b/net/mac80211/rc80211_minstrel_ht_debugfs.c @@ -19,7 +19,7 @@ static char * minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p) { const struct mcs_group *mg; - unsigned int j, tp_max, tp_avg, prob, eprob, tx_time; + unsigned int j, tp_max, tp_avg, eprob, tx_time; char htmode = '2'; char gimode = 'L'; u32 gflags; @@ -83,17 +83,15 @@ minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p) tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100)); tp_avg = minstrel_ht_get_tp_avg(mi, i, j, mrs->prob_ewma); - prob = MINSTREL_TRUNC(mrs->cur_prob * 1000); eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000); p += sprintf(p, "%4u.%1u %4u.%1u %3u.%1u %3u.%1u" - " %3u.%1u %3u %3u %-3u " + " %3u %3u %-3u " "%9llu %-9llu\n", tp_max / 10, tp_max % 10, tp_avg / 10, tp_avg % 10, eprob / 10, eprob % 10, mrs->prob_ewmsd / 10, mrs->prob_ewmsd % 10, - prob / 10, prob % 10, mrs->retry_count, mrs->last_success, mrs->last_attempts, @@ -130,9 +128,9 @@ minstrel_ht_stats_open(struct inode *inode, struct file *file) p += sprintf(p, "\n"); p += sprintf(p, - " best ____________rate__________ ________statistics________ ________last_______ ______sum-of________\n"); + " best ____________rate__________ ________statistics________ _____last____ ______sum-of________\n"); p += sprintf(p, - "mode guard # rate [name idx airtime max_tp] [avg(tp) avg(prob) sd(prob)] [prob.|retry|suc|att] [#success | #attempts]\n"); + "mode guard # rate [name idx airtime max_tp] [avg(tp) avg(prob) sd(prob)] [retry|suc|att] [#success | #attempts]\n"); p = minstrel_ht_stats_dump(mi, MINSTREL_CCK_GROUP, p); for (i = 0; i < MINSTREL_CCK_GROUP; i++) @@ -165,7 +163,7 @@ static char * minstrel_ht_stats_csv_dump(struct minstrel_ht_sta *mi, int i, char *p) { const struct mcs_group *mg; - unsigned int j, tp_max, tp_avg, prob, eprob, tx_time; + unsigned int j, tp_max, tp_avg, eprob, tx_time; char htmode = '2'; char gimode = 'L'; u32 gflags; @@ -226,16 +224,14 @@ minstrel_ht_stats_csv_dump(struct minstrel_ht_sta *mi, int i, char *p) tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100)); tp_avg = minstrel_ht_get_tp_avg(mi, i, j, mrs->prob_ewma); - prob = MINSTREL_TRUNC(mrs->cur_prob * 1000); eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000); - p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u.%u,%u.%u,%u,%u," + p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u.%u,%u,%u," "%u,%llu,%llu,", tp_max / 10, tp_max % 10, tp_avg / 10, tp_avg % 10, eprob / 10, eprob % 10, mrs->prob_ewmsd / 10, mrs->prob_ewmsd % 10, - prob / 10, prob % 10, mrs->retry_count, mrs->last_success, mrs->last_attempts, -- 2.20.1