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author | Kent Overstreet <kent.overstreet@linux.dev> | 2024-03-13 20:16:40 -0400 |
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committer | Kent Overstreet <kent.overstreet@linux.dev> | 2024-03-13 21:30:35 -0400 |
commit | f1ca1abfb0275db241363743ed3606b25b2b1a5c (patch) | |
tree | b0574ca611a60ce3b005aff9f7d30ed9244e0d04 /fs/bcachefs/util.c | |
parent | cdce109431f30108665a7de72b542af7f02cf966 (diff) | |
download | linux-stable-f1ca1abfb0275db241363743ed3606b25b2b1a5c.tar.gz linux-stable-f1ca1abfb0275db241363743ed3606b25b2b1a5c.tar.bz2 linux-stable-f1ca1abfb0275db241363743ed3606b25b2b1a5c.zip |
bcachefs: pull out time_stats.[ch]
prep work for lifting out of fs/bcachefs/
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs/bcachefs/util.c')
-rw-r--r-- | fs/bcachefs/util.c | 196 |
1 files changed, 19 insertions, 177 deletions
diff --git a/fs/bcachefs/util.c b/fs/bcachefs/util.c index bd3687a726f7..96de039fc890 100644 --- a/fs/bcachefs/util.c +++ b/fs/bcachefs/util.c @@ -337,157 +337,16 @@ void bch2_prt_datetime(struct printbuf *out, time64_t sec) } #endif -static const struct time_unit { - const char *name; - u64 nsecs; -} time_units[] = { - { "ns", 1 }, - { "us", NSEC_PER_USEC }, - { "ms", NSEC_PER_MSEC }, - { "s", NSEC_PER_SEC }, - { "m", (u64) NSEC_PER_SEC * 60}, - { "h", (u64) NSEC_PER_SEC * 3600}, - { "eon", U64_MAX }, -}; - -static const struct time_unit *pick_time_units(u64 ns) -{ - const struct time_unit *u; - - for (u = time_units; - u + 1 < time_units + ARRAY_SIZE(time_units) && - ns >= u[1].nsecs << 1; - u++) - ; - - return u; -} - void bch2_pr_time_units(struct printbuf *out, u64 ns) { - const struct time_unit *u = pick_time_units(ns); + const struct time_unit *u = bch2_pick_time_units(ns); prt_printf(out, "%llu %s", div_u64(ns, u->nsecs), u->name); } -/* time stats: */ - -#ifndef CONFIG_BCACHEFS_NO_LATENCY_ACCT -static void bch2_quantiles_update(struct bch2_quantiles *q, u64 v) -{ - unsigned i = 0; - - while (i < ARRAY_SIZE(q->entries)) { - struct bch2_quantile_entry *e = q->entries + i; - - if (unlikely(!e->step)) { - e->m = v; - e->step = max_t(unsigned, v / 2, 1024); - } else if (e->m > v) { - e->m = e->m >= e->step - ? e->m - e->step - : 0; - } else if (e->m < v) { - e->m = e->m + e->step > e->m - ? e->m + e->step - : U32_MAX; - } - - if ((e->m > v ? e->m - v : v - e->m) < e->step) - e->step = max_t(unsigned, e->step / 2, 1); - - if (v >= e->m) - break; - - i = eytzinger0_child(i, v > e->m); - } -} - -static inline void bch2_time_stats_update_one(struct bch2_time_stats *stats, - u64 start, u64 end) -{ - u64 duration, freq; - - if (time_after64(end, start)) { - duration = end - start; - mean_and_variance_update(&stats->duration_stats, duration); - mean_and_variance_weighted_update(&stats->duration_stats_weighted, duration); - stats->max_duration = max(stats->max_duration, duration); - stats->min_duration = min(stats->min_duration, duration); - stats->total_duration += duration; - bch2_quantiles_update(&stats->quantiles, duration); - } - - if (stats->last_event && time_after64(end, stats->last_event)) { - freq = end - stats->last_event; - mean_and_variance_update(&stats->freq_stats, freq); - mean_and_variance_weighted_update(&stats->freq_stats_weighted, freq); - stats->max_freq = max(stats->max_freq, freq); - stats->min_freq = min(stats->min_freq, freq); - } - - stats->last_event = end; -} - -static void __bch2_time_stats_clear_buffer(struct bch2_time_stats *stats, - struct bch2_time_stat_buffer *b) -{ - for (struct bch2_time_stat_buffer_entry *i = b->entries; - i < b->entries + ARRAY_SIZE(b->entries); - i++) - bch2_time_stats_update_one(stats, i->start, i->end); - b->nr = 0; -} - -static noinline void bch2_time_stats_clear_buffer(struct bch2_time_stats *stats, - struct bch2_time_stat_buffer *b) -{ - unsigned long flags; - - spin_lock_irqsave(&stats->lock, flags); - __bch2_time_stats_clear_buffer(stats, b); - spin_unlock_irqrestore(&stats->lock, flags); -} - -void __bch2_time_stats_update(struct bch2_time_stats *stats, u64 start, u64 end) -{ - unsigned long flags; - - WARN_ONCE(!stats->duration_stats_weighted.weight || - !stats->freq_stats_weighted.weight, - "uninitialized time_stats"); - - if (!stats->buffer) { - spin_lock_irqsave(&stats->lock, flags); - bch2_time_stats_update_one(stats, start, end); - - if (mean_and_variance_weighted_get_mean(stats->freq_stats_weighted) < 32 && - stats->duration_stats.n > 1024) - stats->buffer = - alloc_percpu_gfp(struct bch2_time_stat_buffer, - GFP_ATOMIC); - spin_unlock_irqrestore(&stats->lock, flags); - } else { - struct bch2_time_stat_buffer *b; - - preempt_disable(); - b = this_cpu_ptr(stats->buffer); - - BUG_ON(b->nr >= ARRAY_SIZE(b->entries)); - b->entries[b->nr++] = (struct bch2_time_stat_buffer_entry) { - .start = start, - .end = end - }; - - if (unlikely(b->nr == ARRAY_SIZE(b->entries))) - bch2_time_stats_clear_buffer(stats, b); - preempt_enable(); - } -} - static void bch2_pr_time_units_aligned(struct printbuf *out, u64 ns) { - const struct time_unit *u = pick_time_units(ns); + const struct time_unit *u = bch2_pick_time_units(ns); prt_printf(out, "%llu ", div64_u64(ns, u->nsecs)); prt_tab_rjust(out); @@ -506,10 +365,8 @@ static inline void pr_name_and_units(struct printbuf *out, const char *name, u64 void bch2_time_stats_to_text(struct printbuf *out, struct bch2_time_stats *stats) { - const struct time_unit *u; s64 f_mean = 0, d_mean = 0; - u64 q, last_q = 0, f_stddev = 0, d_stddev = 0; - int i; + u64 f_stddev = 0, d_stddev = 0; if (stats->buffer) { int cpu; @@ -608,39 +465,24 @@ void bch2_time_stats_to_text(struct printbuf *out, struct bch2_time_stats *stats printbuf_tabstops_reset(out); - i = eytzinger0_first(NR_QUANTILES); - u = pick_time_units(stats->quantiles.entries[i].m); - - prt_printf(out, "quantiles (%s):\t", u->name); - eytzinger0_for_each(i, NR_QUANTILES) { - bool is_last = eytzinger0_next(i, NR_QUANTILES) == -1; - - q = max(stats->quantiles.entries[i].m, last_q); - prt_printf(out, "%llu ", - div_u64(q, u->nsecs)); - if (is_last) - prt_newline(out); - last_q = q; + if (stats->quantiles_enabled) { + int i = eytzinger0_first(NR_QUANTILES); + const struct time_unit *u = + bch2_pick_time_units(stats->quantiles.entries[i].m); + u64 last_q = 0; + + prt_printf(out, "quantiles (%s):\t", u->name); + eytzinger0_for_each(i, NR_QUANTILES) { + bool is_last = eytzinger0_next(i, NR_QUANTILES) == -1; + + u64 q = max(stats->quantiles.entries[i].m, last_q); + prt_printf(out, "%llu ", div_u64(q, u->nsecs)); + if (is_last) + prt_newline(out); + last_q = q; + } } } -#else -void bch2_time_stats_to_text(struct printbuf *out, struct bch2_time_stats *stats) {} -#endif - -void bch2_time_stats_exit(struct bch2_time_stats *stats) -{ - free_percpu(stats->buffer); -} - -void bch2_time_stats_init(struct bch2_time_stats *stats) -{ - memset(stats, 0, sizeof(*stats)); - stats->duration_stats_weighted.weight = 8; - stats->freq_stats_weighted.weight = 8; - stats->min_duration = U64_MAX; - stats->min_freq = U64_MAX; - spin_lock_init(&stats->lock); -} /* ratelimit: */ |