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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-18 17:39:57 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-18 17:39:57 +0000 |
commit | dc50eab76b709d68175a358d6e23a5a3890764d3 (patch) | |
tree | c754d0390db060af0213ff994f0ac310e4cfd6e9 /fs/bcachefs/util.c | |
parent | Adding debian version 6.6.15-2. (diff) | |
download | linux-dc50eab76b709d68175a358d6e23a5a3890764d3.tar.xz linux-dc50eab76b709d68175a358d6e23a5a3890764d3.zip |
Merging upstream version 6.7.7.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/bcachefs/util.c')
-rw-r--r-- | fs/bcachefs/util.c | 1160 |
1 files changed, 1160 insertions, 0 deletions
diff --git a/fs/bcachefs/util.c b/fs/bcachefs/util.c new file mode 100644 index 0000000000..3b7c349f26 --- /dev/null +++ b/fs/bcachefs/util.c @@ -0,0 +1,1160 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * random utiility code, for bcache but in theory not specific to bcache + * + * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com> + * Copyright 2012 Google, Inc. + */ + +#include <linux/bio.h> +#include <linux/blkdev.h> +#include <linux/console.h> +#include <linux/ctype.h> +#include <linux/debugfs.h> +#include <linux/freezer.h> +#include <linux/kthread.h> +#include <linux/log2.h> +#include <linux/math64.h> +#include <linux/percpu.h> +#include <linux/preempt.h> +#include <linux/random.h> +#include <linux/seq_file.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/sched/clock.h> + +#include "eytzinger.h" +#include "mean_and_variance.h" +#include "util.h" + +static const char si_units[] = "?kMGTPEZY"; + +/* string_get_size units: */ +static const char *const units_2[] = { + "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB" +}; +static const char *const units_10[] = { + "B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" +}; + +static int parse_u64(const char *cp, u64 *res) +{ + const char *start = cp; + u64 v = 0; + + if (!isdigit(*cp)) + return -EINVAL; + + do { + if (v > U64_MAX / 10) + return -ERANGE; + v *= 10; + if (v > U64_MAX - (*cp - '0')) + return -ERANGE; + v += *cp - '0'; + cp++; + } while (isdigit(*cp)); + + *res = v; + return cp - start; +} + +static int bch2_pow(u64 n, u64 p, u64 *res) +{ + *res = 1; + + while (p--) { + if (*res > div_u64(U64_MAX, n)) + return -ERANGE; + *res *= n; + } + return 0; +} + +static int parse_unit_suffix(const char *cp, u64 *res) +{ + const char *start = cp; + u64 base = 1024; + unsigned u; + int ret; + + if (*cp == ' ') + cp++; + + for (u = 1; u < strlen(si_units); u++) + if (*cp == si_units[u]) { + cp++; + goto got_unit; + } + + for (u = 0; u < ARRAY_SIZE(units_2); u++) + if (!strncmp(cp, units_2[u], strlen(units_2[u]))) { + cp += strlen(units_2[u]); + goto got_unit; + } + + for (u = 0; u < ARRAY_SIZE(units_10); u++) + if (!strncmp(cp, units_10[u], strlen(units_10[u]))) { + cp += strlen(units_10[u]); + base = 1000; + goto got_unit; + } + + *res = 1; + return 0; +got_unit: + ret = bch2_pow(base, u, res); + if (ret) + return ret; + + return cp - start; +} + +#define parse_or_ret(cp, _f) \ +do { \ + int _ret = _f; \ + if (_ret < 0) \ + return _ret; \ + cp += _ret; \ +} while (0) + +static int __bch2_strtou64_h(const char *cp, u64 *res) +{ + const char *start = cp; + u64 v = 0, b, f_n = 0, f_d = 1; + int ret; + + parse_or_ret(cp, parse_u64(cp, &v)); + + if (*cp == '.') { + cp++; + ret = parse_u64(cp, &f_n); + if (ret < 0) + return ret; + cp += ret; + + ret = bch2_pow(10, ret, &f_d); + if (ret) + return ret; + } + + parse_or_ret(cp, parse_unit_suffix(cp, &b)); + + if (v > div_u64(U64_MAX, b)) + return -ERANGE; + v *= b; + + if (f_n > div_u64(U64_MAX, b)) + return -ERANGE; + + f_n = div_u64(f_n * b, f_d); + if (v + f_n < v) + return -ERANGE; + v += f_n; + + *res = v; + return cp - start; +} + +static int __bch2_strtoh(const char *cp, u64 *res, + u64 t_max, bool t_signed) +{ + bool positive = *cp != '-'; + u64 v = 0; + + if (*cp == '+' || *cp == '-') + cp++; + + parse_or_ret(cp, __bch2_strtou64_h(cp, &v)); + + if (*cp == '\n') + cp++; + if (*cp) + return -EINVAL; + + if (positive) { + if (v > t_max) + return -ERANGE; + } else { + if (v && !t_signed) + return -ERANGE; + + if (v > t_max + 1) + return -ERANGE; + v = -v; + } + + *res = v; + return 0; +} + +#define STRTO_H(name, type) \ +int bch2_ ## name ## _h(const char *cp, type *res) \ +{ \ + u64 v = 0; \ + int ret = __bch2_strtoh(cp, &v, ANYSINT_MAX(type), \ + ANYSINT_MAX(type) != ((type) ~0ULL)); \ + *res = v; \ + return ret; \ +} + +STRTO_H(strtoint, int) +STRTO_H(strtouint, unsigned int) +STRTO_H(strtoll, long long) +STRTO_H(strtoull, unsigned long long) +STRTO_H(strtou64, u64) + +u64 bch2_read_flag_list(char *opt, const char * const list[]) +{ + u64 ret = 0; + char *p, *s, *d = kstrdup(opt, GFP_KERNEL); + + if (!d) + return -ENOMEM; + + s = strim(d); + + while ((p = strsep(&s, ","))) { + int flag = match_string(list, -1, p); + + if (flag < 0) { + ret = -1; + break; + } + + ret |= 1 << flag; + } + + kfree(d); + + return ret; +} + +bool bch2_is_zero(const void *_p, size_t n) +{ + const char *p = _p; + size_t i; + + for (i = 0; i < n; i++) + if (p[i]) + return false; + return true; +} + +void bch2_prt_u64_binary(struct printbuf *out, u64 v, unsigned nr_bits) +{ + while (nr_bits) + prt_char(out, '0' + ((v >> --nr_bits) & 1)); +} + +void bch2_print_string_as_lines(const char *prefix, const char *lines) +{ + const char *p; + + if (!lines) { + printk("%s (null)\n", prefix); + return; + } + + console_lock(); + while (1) { + p = strchrnul(lines, '\n'); + printk("%s%.*s\n", prefix, (int) (p - lines), lines); + if (!*p) + break; + lines = p + 1; + } + console_unlock(); +} + +int bch2_save_backtrace(bch_stacktrace *stack, struct task_struct *task) +{ +#ifdef CONFIG_STACKTRACE + unsigned nr_entries = 0; + int ret = 0; + + stack->nr = 0; + ret = darray_make_room(stack, 32); + if (ret) + return ret; + + if (!down_read_trylock(&task->signal->exec_update_lock)) + return -1; + + do { + nr_entries = stack_trace_save_tsk(task, stack->data, stack->size, 0); + } while (nr_entries == stack->size && + !(ret = darray_make_room(stack, stack->size * 2))); + + stack->nr = nr_entries; + up_read(&task->signal->exec_update_lock); + + return ret; +#else + return 0; +#endif +} + +void bch2_prt_backtrace(struct printbuf *out, bch_stacktrace *stack) +{ + unsigned long *i; + + darray_for_each(*stack, i) { + prt_printf(out, "[<0>] %pB", (void *) *i); + prt_newline(out); + } +} + +int bch2_prt_task_backtrace(struct printbuf *out, struct task_struct *task) +{ + bch_stacktrace stack = { 0 }; + int ret = bch2_save_backtrace(&stack, task); + + bch2_prt_backtrace(out, &stack); + darray_exit(&stack); + return ret; +} + +/* 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); + 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 noinline void bch2_time_stats_clear_buffer(struct bch2_time_stats *stats, + struct bch2_time_stat_buffer *b) +{ + struct bch2_time_stat_buffer_entry *i; + unsigned long flags; + + spin_lock_irqsave(&stats->lock, flags); + for (i = b->entries; + i < b->entries + ARRAY_SIZE(b->entries); + i++) + bch2_time_stats_update_one(stats, i->start, i->end); + spin_unlock_irqrestore(&stats->lock, flags); + + b->nr = 0; +} + +void __bch2_time_stats_update(struct bch2_time_stats *stats, u64 start, u64 end) +{ + unsigned long flags; + + WARN_RATELIMIT(!stats->min_duration || !stats->min_freq, + "time_stats: min_duration = %llu, min_freq = %llu", + stats->min_duration, stats->min_freq); + + 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(); + } +} +#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); + + prt_printf(out, "%llu %s", div_u64(ns, u->nsecs), u->name); +} + +static void bch2_pr_time_units_aligned(struct printbuf *out, u64 ns) +{ + const struct time_unit *u = pick_time_units(ns); + + prt_printf(out, "%llu ", div64_u64(ns, u->nsecs)); + prt_tab_rjust(out); + prt_printf(out, "%s", u->name); +} + +#ifndef __KERNEL__ +#include <time.h> +void bch2_prt_datetime(struct printbuf *out, time64_t sec) +{ + time_t t = sec; + char buf[64]; + ctime_r(&t, buf); + prt_str(out, buf); +} +#else +void bch2_prt_datetime(struct printbuf *out, time64_t sec) +{ + char buf[64]; + snprintf(buf, sizeof(buf), "%ptT", &sec); + prt_u64(out, sec); +} +#endif + +#define TABSTOP_SIZE 12 + +static inline void pr_name_and_units(struct printbuf *out, const char *name, u64 ns) +{ + prt_str(out, name); + prt_tab(out); + bch2_pr_time_units_aligned(out, ns); + prt_newline(out); +} + +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; + /* + * avoid divide by zero + */ + if (stats->freq_stats.n) { + f_mean = mean_and_variance_get_mean(stats->freq_stats); + f_stddev = mean_and_variance_get_stddev(stats->freq_stats); + d_mean = mean_and_variance_get_mean(stats->duration_stats); + d_stddev = mean_and_variance_get_stddev(stats->duration_stats); + } + + printbuf_tabstop_push(out, out->indent + TABSTOP_SIZE); + prt_printf(out, "count:"); + prt_tab(out); + prt_printf(out, "%llu ", + stats->duration_stats.n); + printbuf_tabstop_pop(out); + prt_newline(out); + + printbuf_tabstops_reset(out); + + printbuf_tabstop_push(out, out->indent + 20); + printbuf_tabstop_push(out, TABSTOP_SIZE + 2); + printbuf_tabstop_push(out, 0); + printbuf_tabstop_push(out, TABSTOP_SIZE + 2); + + prt_tab(out); + prt_printf(out, "since mount"); + prt_tab_rjust(out); + prt_tab(out); + prt_printf(out, "recent"); + prt_tab_rjust(out); + prt_newline(out); + + printbuf_tabstops_reset(out); + printbuf_tabstop_push(out, out->indent + 20); + printbuf_tabstop_push(out, TABSTOP_SIZE); + printbuf_tabstop_push(out, 2); + printbuf_tabstop_push(out, TABSTOP_SIZE); + + prt_printf(out, "duration of events"); + prt_newline(out); + printbuf_indent_add(out, 2); + + pr_name_and_units(out, "min:", stats->min_duration); + pr_name_and_units(out, "max:", stats->max_duration); + + prt_printf(out, "mean:"); + prt_tab(out); + bch2_pr_time_units_aligned(out, d_mean); + prt_tab(out); + bch2_pr_time_units_aligned(out, mean_and_variance_weighted_get_mean(stats->duration_stats_weighted)); + prt_newline(out); + + prt_printf(out, "stddev:"); + prt_tab(out); + bch2_pr_time_units_aligned(out, d_stddev); + prt_tab(out); + bch2_pr_time_units_aligned(out, mean_and_variance_weighted_get_stddev(stats->duration_stats_weighted)); + + printbuf_indent_sub(out, 2); + prt_newline(out); + + prt_printf(out, "time between events"); + prt_newline(out); + printbuf_indent_add(out, 2); + + pr_name_and_units(out, "min:", stats->min_freq); + pr_name_and_units(out, "max:", stats->max_freq); + + prt_printf(out, "mean:"); + prt_tab(out); + bch2_pr_time_units_aligned(out, f_mean); + prt_tab(out); + bch2_pr_time_units_aligned(out, mean_and_variance_weighted_get_mean(stats->freq_stats_weighted)); + prt_newline(out); + + prt_printf(out, "stddev:"); + prt_tab(out); + bch2_pr_time_units_aligned(out, f_stddev); + prt_tab(out); + bch2_pr_time_units_aligned(out, mean_and_variance_weighted_get_stddev(stats->freq_stats_weighted)); + + printbuf_indent_sub(out, 2); + prt_newline(out); + + 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; + } +} + +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: */ + +/** + * bch2_ratelimit_delay() - return how long to delay until the next time to do + * some work + * @d: the struct bch_ratelimit to update + * Returns: the amount of time to delay by, in jiffies + */ +u64 bch2_ratelimit_delay(struct bch_ratelimit *d) +{ + u64 now = local_clock(); + + return time_after64(d->next, now) + ? nsecs_to_jiffies(d->next - now) + : 0; +} + +/** + * bch2_ratelimit_increment() - increment @d by the amount of work done + * @d: the struct bch_ratelimit to update + * @done: the amount of work done, in arbitrary units + */ +void bch2_ratelimit_increment(struct bch_ratelimit *d, u64 done) +{ + u64 now = local_clock(); + + d->next += div_u64(done * NSEC_PER_SEC, d->rate); + + if (time_before64(now + NSEC_PER_SEC, d->next)) + d->next = now + NSEC_PER_SEC; + + if (time_after64(now - NSEC_PER_SEC * 2, d->next)) + d->next = now - NSEC_PER_SEC * 2; +} + +/* pd controller: */ + +/* + * Updates pd_controller. Attempts to scale inputed values to units per second. + * @target: desired value + * @actual: current value + * + * @sign: 1 or -1; 1 if increasing the rate makes actual go up, -1 if increasing + * it makes actual go down. + */ +void bch2_pd_controller_update(struct bch_pd_controller *pd, + s64 target, s64 actual, int sign) +{ + s64 proportional, derivative, change; + + unsigned long seconds_since_update = (jiffies - pd->last_update) / HZ; + + if (seconds_since_update == 0) + return; + + pd->last_update = jiffies; + + proportional = actual - target; + proportional *= seconds_since_update; + proportional = div_s64(proportional, pd->p_term_inverse); + + derivative = actual - pd->last_actual; + derivative = div_s64(derivative, seconds_since_update); + derivative = ewma_add(pd->smoothed_derivative, derivative, + (pd->d_term / seconds_since_update) ?: 1); + derivative = derivative * pd->d_term; + derivative = div_s64(derivative, pd->p_term_inverse); + + change = proportional + derivative; + + /* Don't increase rate if not keeping up */ + if (change > 0 && + pd->backpressure && + time_after64(local_clock(), + pd->rate.next + NSEC_PER_MSEC)) + change = 0; + + change *= (sign * -1); + + pd->rate.rate = clamp_t(s64, (s64) pd->rate.rate + change, + 1, UINT_MAX); + + pd->last_actual = actual; + pd->last_derivative = derivative; + pd->last_proportional = proportional; + pd->last_change = change; + pd->last_target = target; +} + +void bch2_pd_controller_init(struct bch_pd_controller *pd) +{ + pd->rate.rate = 1024; + pd->last_update = jiffies; + pd->p_term_inverse = 6000; + pd->d_term = 30; + pd->d_smooth = pd->d_term; + pd->backpressure = 1; +} + +void bch2_pd_controller_debug_to_text(struct printbuf *out, struct bch_pd_controller *pd) +{ + if (!out->nr_tabstops) + printbuf_tabstop_push(out, 20); + + prt_printf(out, "rate:"); + prt_tab(out); + prt_human_readable_s64(out, pd->rate.rate); + prt_newline(out); + + prt_printf(out, "target:"); + prt_tab(out); + prt_human_readable_u64(out, pd->last_target); + prt_newline(out); + + prt_printf(out, "actual:"); + prt_tab(out); + prt_human_readable_u64(out, pd->last_actual); + prt_newline(out); + + prt_printf(out, "proportional:"); + prt_tab(out); + prt_human_readable_s64(out, pd->last_proportional); + prt_newline(out); + + prt_printf(out, "derivative:"); + prt_tab(out); + prt_human_readable_s64(out, pd->last_derivative); + prt_newline(out); + + prt_printf(out, "change:"); + prt_tab(out); + prt_human_readable_s64(out, pd->last_change); + prt_newline(out); + + prt_printf(out, "next io:"); + prt_tab(out); + prt_printf(out, "%llims", div64_s64(pd->rate.next - local_clock(), NSEC_PER_MSEC)); + prt_newline(out); +} + +/* misc: */ + +void bch2_bio_map(struct bio *bio, void *base, size_t size) +{ + while (size) { + struct page *page = is_vmalloc_addr(base) + ? vmalloc_to_page(base) + : virt_to_page(base); + unsigned offset = offset_in_page(base); + unsigned len = min_t(size_t, PAGE_SIZE - offset, size); + + BUG_ON(!bio_add_page(bio, page, len, offset)); + size -= len; + base += len; + } +} + +int bch2_bio_alloc_pages(struct bio *bio, size_t size, gfp_t gfp_mask) +{ + while (size) { + struct page *page = alloc_pages(gfp_mask, 0); + unsigned len = min_t(size_t, PAGE_SIZE, size); + + if (!page) + return -ENOMEM; + + if (unlikely(!bio_add_page(bio, page, len, 0))) { + __free_page(page); + break; + } + + size -= len; + } + + return 0; +} + +size_t bch2_rand_range(size_t max) +{ + size_t rand; + + if (!max) + return 0; + + do { + rand = get_random_long(); + rand &= roundup_pow_of_two(max) - 1; + } while (rand >= max); + + return rand; +} + +void memcpy_to_bio(struct bio *dst, struct bvec_iter dst_iter, const void *src) +{ + struct bio_vec bv; + struct bvec_iter iter; + + __bio_for_each_segment(bv, dst, iter, dst_iter) { + void *dstp = kmap_local_page(bv.bv_page); + + memcpy(dstp + bv.bv_offset, src, bv.bv_len); + kunmap_local(dstp); + + src += bv.bv_len; + } +} + +void memcpy_from_bio(void *dst, struct bio *src, struct bvec_iter src_iter) +{ + struct bio_vec bv; + struct bvec_iter iter; + + __bio_for_each_segment(bv, src, iter, src_iter) { + void *srcp = kmap_local_page(bv.bv_page); + + memcpy(dst, srcp + bv.bv_offset, bv.bv_len); + kunmap_local(srcp); + + dst += bv.bv_len; + } +} + +static int alignment_ok(const void *base, size_t align) +{ + return IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) || + ((unsigned long)base & (align - 1)) == 0; +} + +static void u32_swap(void *a, void *b, size_t size) +{ + u32 t = *(u32 *)a; + *(u32 *)a = *(u32 *)b; + *(u32 *)b = t; +} + +static void u64_swap(void *a, void *b, size_t size) +{ + u64 t = *(u64 *)a; + *(u64 *)a = *(u64 *)b; + *(u64 *)b = t; +} + +static void generic_swap(void *a, void *b, size_t size) +{ + char t; + + do { + t = *(char *)a; + *(char *)a++ = *(char *)b; + *(char *)b++ = t; + } while (--size > 0); +} + +static inline int do_cmp(void *base, size_t n, size_t size, + int (*cmp_func)(const void *, const void *, size_t), + size_t l, size_t r) +{ + return cmp_func(base + inorder_to_eytzinger0(l, n) * size, + base + inorder_to_eytzinger0(r, n) * size, + size); +} + +static inline void do_swap(void *base, size_t n, size_t size, + void (*swap_func)(void *, void *, size_t), + size_t l, size_t r) +{ + swap_func(base + inorder_to_eytzinger0(l, n) * size, + base + inorder_to_eytzinger0(r, n) * size, + size); +} + +void eytzinger0_sort(void *base, size_t n, size_t size, + int (*cmp_func)(const void *, const void *, size_t), + void (*swap_func)(void *, void *, size_t)) +{ + int i, c, r; + + if (!swap_func) { + if (size == 4 && alignment_ok(base, 4)) + swap_func = u32_swap; + else if (size == 8 && alignment_ok(base, 8)) + swap_func = u64_swap; + else + swap_func = generic_swap; + } + + /* heapify */ + for (i = n / 2 - 1; i >= 0; --i) { + for (r = i; r * 2 + 1 < n; r = c) { + c = r * 2 + 1; + + if (c + 1 < n && + do_cmp(base, n, size, cmp_func, c, c + 1) < 0) + c++; + + if (do_cmp(base, n, size, cmp_func, r, c) >= 0) + break; + + do_swap(base, n, size, swap_func, r, c); + } + } + + /* sort */ + for (i = n - 1; i > 0; --i) { + do_swap(base, n, size, swap_func, 0, i); + + for (r = 0; r * 2 + 1 < i; r = c) { + c = r * 2 + 1; + + if (c + 1 < i && + do_cmp(base, n, size, cmp_func, c, c + 1) < 0) + c++; + + if (do_cmp(base, n, size, cmp_func, r, c) >= 0) + break; + + do_swap(base, n, size, swap_func, r, c); + } + } +} + +void sort_cmp_size(void *base, size_t num, size_t size, + int (*cmp_func)(const void *, const void *, size_t), + void (*swap_func)(void *, void *, size_t size)) +{ + /* pre-scale counters for performance */ + int i = (num/2 - 1) * size, n = num * size, c, r; + + if (!swap_func) { + if (size == 4 && alignment_ok(base, 4)) + swap_func = u32_swap; + else if (size == 8 && alignment_ok(base, 8)) + swap_func = u64_swap; + else + swap_func = generic_swap; + } + + /* heapify */ + for ( ; i >= 0; i -= size) { + for (r = i; r * 2 + size < n; r = c) { + c = r * 2 + size; + if (c < n - size && + cmp_func(base + c, base + c + size, size) < 0) + c += size; + if (cmp_func(base + r, base + c, size) >= 0) + break; + swap_func(base + r, base + c, size); + } + } + + /* sort */ + for (i = n - size; i > 0; i -= size) { + swap_func(base, base + i, size); + for (r = 0; r * 2 + size < i; r = c) { + c = r * 2 + size; + if (c < i - size && + cmp_func(base + c, base + c + size, size) < 0) + c += size; + if (cmp_func(base + r, base + c, size) >= 0) + break; + swap_func(base + r, base + c, size); + } + } +} + +static void mempool_free_vp(void *element, void *pool_data) +{ + size_t size = (size_t) pool_data; + + vpfree(element, size); +} + +static void *mempool_alloc_vp(gfp_t gfp_mask, void *pool_data) +{ + size_t size = (size_t) pool_data; + + return vpmalloc(size, gfp_mask); +} + +int mempool_init_kvpmalloc_pool(mempool_t *pool, int min_nr, size_t size) +{ + return size < PAGE_SIZE + ? mempool_init_kmalloc_pool(pool, min_nr, size) + : mempool_init(pool, min_nr, mempool_alloc_vp, + mempool_free_vp, (void *) size); +} + +#if 0 +void eytzinger1_test(void) +{ + unsigned inorder, eytz, size; + + pr_info("1 based eytzinger test:"); + + for (size = 2; + size < 65536; + size++) { + unsigned extra = eytzinger1_extra(size); + + if (!(size % 4096)) + pr_info("tree size %u", size); + + BUG_ON(eytzinger1_prev(0, size) != eytzinger1_last(size)); + BUG_ON(eytzinger1_next(0, size) != eytzinger1_first(size)); + + BUG_ON(eytzinger1_prev(eytzinger1_first(size), size) != 0); + BUG_ON(eytzinger1_next(eytzinger1_last(size), size) != 0); + + inorder = 1; + eytzinger1_for_each(eytz, size) { + BUG_ON(__inorder_to_eytzinger1(inorder, size, extra) != eytz); + BUG_ON(__eytzinger1_to_inorder(eytz, size, extra) != inorder); + BUG_ON(eytz != eytzinger1_last(size) && + eytzinger1_prev(eytzinger1_next(eytz, size), size) != eytz); + + inorder++; + } + } +} + +void eytzinger0_test(void) +{ + + unsigned inorder, eytz, size; + + pr_info("0 based eytzinger test:"); + + for (size = 1; + size < 65536; + size++) { + unsigned extra = eytzinger0_extra(size); + + if (!(size % 4096)) + pr_info("tree size %u", size); + + BUG_ON(eytzinger0_prev(-1, size) != eytzinger0_last(size)); + BUG_ON(eytzinger0_next(-1, size) != eytzinger0_first(size)); + + BUG_ON(eytzinger0_prev(eytzinger0_first(size), size) != -1); + BUG_ON(eytzinger0_next(eytzinger0_last(size), size) != -1); + + inorder = 0; + eytzinger0_for_each(eytz, size) { + BUG_ON(__inorder_to_eytzinger0(inorder, size, extra) != eytz); + BUG_ON(__eytzinger0_to_inorder(eytz, size, extra) != inorder); + BUG_ON(eytz != eytzinger0_last(size) && + eytzinger0_prev(eytzinger0_next(eytz, size), size) != eytz); + + inorder++; + } + } +} + +static inline int cmp_u16(const void *_l, const void *_r, size_t size) +{ + const u16 *l = _l, *r = _r; + + return (*l > *r) - (*r - *l); +} + +static void eytzinger0_find_test_val(u16 *test_array, unsigned nr, u16 search) +{ + int i, c1 = -1, c2 = -1; + ssize_t r; + + r = eytzinger0_find_le(test_array, nr, + sizeof(test_array[0]), + cmp_u16, &search); + if (r >= 0) + c1 = test_array[r]; + + for (i = 0; i < nr; i++) + if (test_array[i] <= search && test_array[i] > c2) + c2 = test_array[i]; + + if (c1 != c2) { + eytzinger0_for_each(i, nr) + pr_info("[%3u] = %12u", i, test_array[i]); + pr_info("find_le(%2u) -> [%2zi] = %2i should be %2i", + i, r, c1, c2); + } +} + +void eytzinger0_find_test(void) +{ + unsigned i, nr, allocated = 1 << 12; + u16 *test_array = kmalloc_array(allocated, sizeof(test_array[0]), GFP_KERNEL); + + for (nr = 1; nr < allocated; nr++) { + pr_info("testing %u elems", nr); + + get_random_bytes(test_array, nr * sizeof(test_array[0])); + eytzinger0_sort(test_array, nr, sizeof(test_array[0]), cmp_u16, NULL); + + /* verify array is sorted correctly: */ + eytzinger0_for_each(i, nr) + BUG_ON(i != eytzinger0_last(nr) && + test_array[i] > test_array[eytzinger0_next(i, nr)]); + + for (i = 0; i < U16_MAX; i += 1 << 12) + eytzinger0_find_test_val(test_array, nr, i); + + for (i = 0; i < nr; i++) { + eytzinger0_find_test_val(test_array, nr, test_array[i] - 1); + eytzinger0_find_test_val(test_array, nr, test_array[i]); + eytzinger0_find_test_val(test_array, nr, test_array[i] + 1); + } + } + + kfree(test_array); +} +#endif + +/* + * Accumulate percpu counters onto one cpu's copy - only valid when access + * against any percpu counter is guarded against + */ +u64 *bch2_acc_percpu_u64s(u64 __percpu *p, unsigned nr) +{ + u64 *ret; + int cpu; + + /* access to pcpu vars has to be blocked by other locking */ + preempt_disable(); + ret = this_cpu_ptr(p); + preempt_enable(); + + for_each_possible_cpu(cpu) { + u64 *i = per_cpu_ptr(p, cpu); + + if (i != ret) { + acc_u64s(ret, i, nr); + memset(i, 0, nr * sizeof(u64)); + } + } + + return ret; +} |