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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/perf/util/ordered-events.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | tools/perf/util/ordered-events.c | 416 |
1 files changed, 416 insertions, 0 deletions
diff --git a/tools/perf/util/ordered-events.c b/tools/perf/util/ordered-events.c new file mode 100644 index 000000000..48c8f6094 --- /dev/null +++ b/tools/perf/util/ordered-events.c @@ -0,0 +1,416 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <errno.h> +#include <inttypes.h> +#include <linux/list.h> +#include <linux/compiler.h> +#include <linux/string.h> +#include "ordered-events.h" +#include "session.h" +#include "asm/bug.h" +#include "debug.h" +#include "ui/progress.h" + +#define pr_N(n, fmt, ...) \ + eprintf(n, debug_ordered_events, fmt, ##__VA_ARGS__) + +#define pr(fmt, ...) pr_N(1, pr_fmt(fmt), ##__VA_ARGS__) + +static void queue_event(struct ordered_events *oe, struct ordered_event *new) +{ + struct ordered_event *last = oe->last; + u64 timestamp = new->timestamp; + struct list_head *p; + + ++oe->nr_events; + oe->last = new; + + pr_oe_time2(timestamp, "queue_event nr_events %u\n", oe->nr_events); + + if (!last) { + list_add(&new->list, &oe->events); + oe->max_timestamp = timestamp; + return; + } + + /* + * last event might point to some random place in the list as it's + * the last queued event. We expect that the new event is close to + * this. + */ + if (last->timestamp <= timestamp) { + while (last->timestamp <= timestamp) { + p = last->list.next; + if (p == &oe->events) { + list_add_tail(&new->list, &oe->events); + oe->max_timestamp = timestamp; + return; + } + last = list_entry(p, struct ordered_event, list); + } + list_add_tail(&new->list, &last->list); + } else { + while (last->timestamp > timestamp) { + p = last->list.prev; + if (p == &oe->events) { + list_add(&new->list, &oe->events); + return; + } + last = list_entry(p, struct ordered_event, list); + } + list_add(&new->list, &last->list); + } +} + +static union perf_event *__dup_event(struct ordered_events *oe, + union perf_event *event) +{ + union perf_event *new_event = NULL; + + if (oe->cur_alloc_size < oe->max_alloc_size) { + new_event = memdup(event, event->header.size); + if (new_event) + oe->cur_alloc_size += event->header.size; + } + + return new_event; +} + +static union perf_event *dup_event(struct ordered_events *oe, + union perf_event *event) +{ + return oe->copy_on_queue ? __dup_event(oe, event) : event; +} + +static void __free_dup_event(struct ordered_events *oe, union perf_event *event) +{ + if (event) { + oe->cur_alloc_size -= event->header.size; + free(event); + } +} + +static void free_dup_event(struct ordered_events *oe, union perf_event *event) +{ + if (oe->copy_on_queue) + __free_dup_event(oe, event); +} + +#define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct ordered_event)) +static struct ordered_event *alloc_event(struct ordered_events *oe, + union perf_event *event) +{ + struct list_head *cache = &oe->cache; + struct ordered_event *new = NULL; + union perf_event *new_event; + size_t size; + + new_event = dup_event(oe, event); + if (!new_event) + return NULL; + + /* + * We maintain the following scheme of buffers for ordered + * event allocation: + * + * to_free list -> buffer1 (64K) + * buffer2 (64K) + * ... + * + * Each buffer keeps an array of ordered events objects: + * buffer -> event[0] + * event[1] + * ... + * + * Each allocated ordered event is linked to one of + * following lists: + * - time ordered list 'events' + * - list of currently removed events 'cache' + * + * Allocation of the ordered event uses the following order + * to get the memory: + * - use recently removed object from 'cache' list + * - use available object in current allocation buffer + * - allocate new buffer if the current buffer is full + * + * Removal of ordered event object moves it from events to + * the cache list. + */ + size = sizeof(*oe->buffer) + MAX_SAMPLE_BUFFER * sizeof(*new); + + if (!list_empty(cache)) { + new = list_entry(cache->next, struct ordered_event, list); + list_del_init(&new->list); + } else if (oe->buffer) { + new = &oe->buffer->event[oe->buffer_idx]; + if (++oe->buffer_idx == MAX_SAMPLE_BUFFER) + oe->buffer = NULL; + } else if ((oe->cur_alloc_size + size) < oe->max_alloc_size) { + oe->buffer = malloc(size); + if (!oe->buffer) { + free_dup_event(oe, new_event); + return NULL; + } + + pr("alloc size %" PRIu64 "B (+%zu), max %" PRIu64 "B\n", + oe->cur_alloc_size, size, oe->max_alloc_size); + + oe->cur_alloc_size += size; + list_add(&oe->buffer->list, &oe->to_free); + + oe->buffer_idx = 1; + new = &oe->buffer->event[0]; + } else { + pr("allocation limit reached %" PRIu64 "B\n", oe->max_alloc_size); + return NULL; + } + + new->event = new_event; + return new; +} + +static struct ordered_event * +ordered_events__new_event(struct ordered_events *oe, u64 timestamp, + union perf_event *event) +{ + struct ordered_event *new; + + new = alloc_event(oe, event); + if (new) { + new->timestamp = timestamp; + queue_event(oe, new); + } + + return new; +} + +void ordered_events__delete(struct ordered_events *oe, struct ordered_event *event) +{ + list_move(&event->list, &oe->cache); + oe->nr_events--; + free_dup_event(oe, event->event); + event->event = NULL; +} + +int ordered_events__queue(struct ordered_events *oe, union perf_event *event, + u64 timestamp, u64 file_offset) +{ + struct ordered_event *oevent; + + if (!timestamp || timestamp == ~0ULL) + return -ETIME; + + if (timestamp < oe->last_flush) { + pr_oe_time(timestamp, "out of order event\n"); + pr_oe_time(oe->last_flush, "last flush, last_flush_type %d\n", + oe->last_flush_type); + + oe->nr_unordered_events++; + } + + oevent = ordered_events__new_event(oe, timestamp, event); + if (!oevent) { + ordered_events__flush(oe, OE_FLUSH__HALF); + oevent = ordered_events__new_event(oe, timestamp, event); + } + + if (!oevent) + return -ENOMEM; + + oevent->file_offset = file_offset; + return 0; +} + +static int do_flush(struct ordered_events *oe, bool show_progress) +{ + struct list_head *head = &oe->events; + struct ordered_event *tmp, *iter; + u64 limit = oe->next_flush; + u64 last_ts = oe->last ? oe->last->timestamp : 0ULL; + struct ui_progress prog; + int ret; + + if (!limit) + return 0; + + if (show_progress) + ui_progress__init(&prog, oe->nr_events, "Processing time ordered events..."); + + list_for_each_entry_safe(iter, tmp, head, list) { + if (session_done()) + return 0; + + if (iter->timestamp > limit) + break; + ret = oe->deliver(oe, iter); + if (ret) + return ret; + + ordered_events__delete(oe, iter); + oe->last_flush = iter->timestamp; + + if (show_progress) + ui_progress__update(&prog, 1); + } + + if (list_empty(head)) + oe->last = NULL; + else if (last_ts <= limit) + oe->last = list_entry(head->prev, struct ordered_event, list); + + if (show_progress) + ui_progress__finish(); + + return 0; +} + +static int __ordered_events__flush(struct ordered_events *oe, enum oe_flush how, + u64 timestamp) +{ + static const char * const str[] = { + "NONE", + "FINAL", + "ROUND", + "HALF ", + "TOP ", + "TIME ", + }; + int err; + bool show_progress = false; + + if (oe->nr_events == 0) + return 0; + + switch (how) { + case OE_FLUSH__FINAL: + show_progress = true; + __fallthrough; + case OE_FLUSH__TOP: + oe->next_flush = ULLONG_MAX; + break; + + case OE_FLUSH__HALF: + { + struct ordered_event *first, *last; + struct list_head *head = &oe->events; + + first = list_entry(head->next, struct ordered_event, list); + last = oe->last; + + /* Warn if we are called before any event got allocated. */ + if (WARN_ONCE(!last || list_empty(head), "empty queue")) + return 0; + + oe->next_flush = first->timestamp; + oe->next_flush += (last->timestamp - first->timestamp) / 2; + break; + } + + case OE_FLUSH__TIME: + oe->next_flush = timestamp; + show_progress = false; + break; + + case OE_FLUSH__ROUND: + case OE_FLUSH__NONE: + default: + break; + } + + pr_oe_time(oe->next_flush, "next_flush - ordered_events__flush PRE %s, nr_events %u\n", + str[how], oe->nr_events); + pr_oe_time(oe->max_timestamp, "max_timestamp\n"); + + err = do_flush(oe, show_progress); + + if (!err) { + if (how == OE_FLUSH__ROUND) + oe->next_flush = oe->max_timestamp; + + oe->last_flush_type = how; + } + + pr_oe_time(oe->next_flush, "next_flush - ordered_events__flush POST %s, nr_events %u\n", + str[how], oe->nr_events); + pr_oe_time(oe->last_flush, "last_flush\n"); + + return err; +} + +int ordered_events__flush(struct ordered_events *oe, enum oe_flush how) +{ + return __ordered_events__flush(oe, how, 0); +} + +int ordered_events__flush_time(struct ordered_events *oe, u64 timestamp) +{ + return __ordered_events__flush(oe, OE_FLUSH__TIME, timestamp); +} + +u64 ordered_events__first_time(struct ordered_events *oe) +{ + struct ordered_event *event; + + if (list_empty(&oe->events)) + return 0; + + event = list_first_entry(&oe->events, struct ordered_event, list); + return event->timestamp; +} + +void ordered_events__init(struct ordered_events *oe, ordered_events__deliver_t deliver, + void *data) +{ + INIT_LIST_HEAD(&oe->events); + INIT_LIST_HEAD(&oe->cache); + INIT_LIST_HEAD(&oe->to_free); + oe->max_alloc_size = (u64) -1; + oe->cur_alloc_size = 0; + oe->deliver = deliver; + oe->data = data; +} + +static void +ordered_events_buffer__free(struct ordered_events_buffer *buffer, + unsigned int max, struct ordered_events *oe) +{ + if (oe->copy_on_queue) { + unsigned int i; + + for (i = 0; i < max; i++) + __free_dup_event(oe, buffer->event[i].event); + } + + free(buffer); +} + +void ordered_events__free(struct ordered_events *oe) +{ + struct ordered_events_buffer *buffer, *tmp; + + if (list_empty(&oe->to_free)) + return; + + /* + * Current buffer might not have all the events allocated + * yet, we need to free only allocated ones ... + */ + if (oe->buffer) { + list_del_init(&oe->buffer->list); + ordered_events_buffer__free(oe->buffer, oe->buffer_idx, oe); + } + + /* ... and continue with the rest */ + list_for_each_entry_safe(buffer, tmp, &oe->to_free, list) { + list_del_init(&buffer->list); + ordered_events_buffer__free(buffer, MAX_SAMPLE_BUFFER, oe); + } +} + +void ordered_events__reinit(struct ordered_events *oe) +{ + ordered_events__deliver_t old_deliver = oe->deliver; + + ordered_events__free(oe); + memset(oe, '\0', sizeof(*oe)); + ordered_events__init(oe, old_deliver, oe->data); +} |