/* * Copyright (C) 2008 Felix Fietkau * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #ifndef __RC_MINSTREL_H #define __RC_MINSTREL_H #define EWMA_LEVEL 96 /* ewma weighting factor [/EWMA_DIV] */ #define EWMA_DIV 128 #define SAMPLE_COLUMNS 10 /* number of columns in sample table */ /* scaled fraction values */ #define MINSTREL_SCALE 12 #define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div) #define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE) /* number of highest throughput rates to consider*/ #define MAX_THR_RATES 4 /* * Perform EWMA (Exponentially Weighted Moving Average) calculation */ static inline int minstrel_ewma(int old, int new, int weight) { int diff, incr; diff = new - old; incr = (EWMA_DIV - weight) * diff / EWMA_DIV; return old + incr; } /* * Perform EWMV (Exponentially Weighted Moving Variance) calculation */ static inline int minstrel_ewmv(int old_ewmv, int cur_prob, int prob_ewma, int weight) { int diff, incr; diff = cur_prob - prob_ewma; incr = (EWMA_DIV - weight) * diff / EWMA_DIV; return weight * (old_ewmv + MINSTREL_TRUNC(diff * incr)) / EWMA_DIV; } struct minstrel_rate_stats { /* current / last sampling period attempts/success counters */ u16 attempts, last_attempts; u16 success, last_success; /* total attempts/success counters */ u32 att_hist, succ_hist; /* statistis of packet delivery probability * prob_ewma - exponential weighted moving average of prob * prob_ewmsd - exp. weighted moving standard deviation of prob */ u16 prob_ewma; u16 prob_ewmv; /* maximum retry counts */ u8 retry_count; u8 retry_count_rtscts; u8 sample_skipped; bool retry_updated; }; struct minstrel_rate { int bitrate; s8 rix; u8 retry_count_cts; u8 adjusted_retry_count; unsigned int perfect_tx_time; unsigned int ack_time; int sample_limit; struct minstrel_rate_stats stats; }; struct minstrel_sta_info { struct ieee80211_sta *sta; unsigned long last_stats_update; unsigned int sp_ack_dur; unsigned int rate_avg; unsigned int lowest_rix; u8 max_tp_rate[MAX_THR_RATES]; u8 max_prob_rate; unsigned int total_packets; unsigned int sample_packets; int sample_deferred; unsigned int sample_row; unsigned int sample_column; int n_rates; struct minstrel_rate *r; bool prev_sample; /* sampling table */ u8 *sample_table; #ifdef CONFIG_MAC80211_DEBUGFS struct dentry *dbg_stats; struct dentry *dbg_stats_csv; #endif }; struct minstrel_priv { struct ieee80211_hw *hw; bool has_mrr; unsigned int cw_min; unsigned int cw_max; unsigned int max_retry; unsigned int segment_size; unsigned int update_interval; unsigned int lookaround_rate; unsigned int lookaround_rate_mrr; u8 cck_rates[4]; #ifdef CONFIG_MAC80211_DEBUGFS /* * enable fixed rate processing per RC * - write static index to debugfs:ieee80211/phyX/rc/fixed_rate_idx * - write -1 to enable RC processing again * - setting will be applied on next update */ u32 fixed_rate_idx; struct dentry *dbg_fixed_rate; #endif }; struct minstrel_debugfs_info { size_t len; char buf[]; }; /* Get EWMSD (Exponentially Weighted Moving Standard Deviation) * 10 */ static inline int minstrel_get_ewmsd10(struct minstrel_rate_stats *mrs) { unsigned int ewmv = mrs->prob_ewmv; return int_sqrt(MINSTREL_TRUNC(ewmv * 1000 * 1000)); } extern const struct rate_control_ops mac80211_minstrel; void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir); void minstrel_remove_sta_debugfs(void *priv, void *priv_sta); /* Recalculate success probabilities and counters for a given rate using EWMA */ void minstrel_calc_rate_stats(struct minstrel_rate_stats *mrs); int minstrel_get_tp_avg(struct minstrel_rate *mr, int prob_ewma); /* debugfs */ int minstrel_stats_open(struct inode *inode, struct file *file); int minstrel_stats_csv_open(struct inode *inode, struct file *file); ssize_t minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos); int minstrel_stats_release(struct inode *inode, struct file *file); #endif option value='1'>ssdiff
authorThomas Gleixner <tglx@linutronix.de>2017-01-31 23:58:38 +0100
committerIngo Molnar <mingo@kernel.org>2017-02-01 08:37:27 +0100
commitdd86e373e09fb16b83e8adf5c48c421a4ca76468 (patch)
tree55703c2ea8584e303e342090614e0aab3509ab21 /net/can/af_can.c
parent0b3589be9b98994ce3d5aeca52445d1f5627c4ba (diff)
perf/x86/intel/rapl: Make package handling more robust
The package management code in RAPL relies on package mapping being available before a CPU is started. This changed with: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust") because the ACPI/BIOS information turned out to be unreliable, but that left RAPL in broken state. This was not noticed because on a regular boot all CPUs are online before RAPL is initialized. A possible fix would be to reintroduce the mess which allocates a package data structure in CPU prepare and when it turns out to already exist in starting throw it away later in the CPU online callback. But that's a horrible hack and not required at all because RAPL becomes functional for perf only in the CPU online callback. That's correct because user space is not yet informed about the CPU being onlined, so nothing caan rely on RAPL being available on that particular CPU. Move the allocation to the CPU online callback and simplify the hotplug handling. At this point the package mapping is established and correct. This also adds a missing check for available package data in the event_init() function. Reported-by: Yasuaki Ishimatsu <yasu.isimatu@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Siewior <bigeasy@linutronix.de> Cc: Stephane Eranian <eranian@google.com> Cc: Vince Weaver <vincent.weaver@maine.edu> Fixes: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust") Link: http://lkml.kernel.org/r/20170131230141.212593966@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'net/can/af_can.c')