311 lines
7.1 KiB
C
311 lines
7.1 KiB
C
#include <linux/list.h>
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#include <linux/compiler.h>
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#include <linux/string.h>
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#include "ordered-events.h"
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#include "session.h"
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#include "asm/bug.h"
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#include "debug.h"
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#define pr_N(n, fmt, ...) \
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eprintf(n, debug_ordered_events, fmt, ##__VA_ARGS__)
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#define pr(fmt, ...) pr_N(1, pr_fmt(fmt), ##__VA_ARGS__)
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static void queue_event(struct ordered_events *oe, struct ordered_event *new)
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{
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struct ordered_event *last = oe->last;
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u64 timestamp = new->timestamp;
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struct list_head *p;
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++oe->nr_events;
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oe->last = new;
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pr_oe_time2(timestamp, "queue_event nr_events %u\n", oe->nr_events);
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if (!last) {
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list_add(&new->list, &oe->events);
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oe->max_timestamp = timestamp;
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return;
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}
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/*
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* last event might point to some random place in the list as it's
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* the last queued event. We expect that the new event is close to
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* this.
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*/
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if (last->timestamp <= timestamp) {
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while (last->timestamp <= timestamp) {
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p = last->list.next;
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if (p == &oe->events) {
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list_add_tail(&new->list, &oe->events);
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oe->max_timestamp = timestamp;
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return;
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}
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last = list_entry(p, struct ordered_event, list);
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}
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list_add_tail(&new->list, &last->list);
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} else {
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while (last->timestamp > timestamp) {
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p = last->list.prev;
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if (p == &oe->events) {
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list_add(&new->list, &oe->events);
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return;
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}
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last = list_entry(p, struct ordered_event, list);
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}
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list_add(&new->list, &last->list);
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}
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}
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static union perf_event *__dup_event(struct ordered_events *oe,
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union perf_event *event)
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{
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union perf_event *new_event = NULL;
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if (oe->cur_alloc_size < oe->max_alloc_size) {
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new_event = memdup(event, event->header.size);
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if (new_event)
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oe->cur_alloc_size += event->header.size;
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}
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return new_event;
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}
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static union perf_event *dup_event(struct ordered_events *oe,
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union perf_event *event)
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{
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return oe->copy_on_queue ? __dup_event(oe, event) : event;
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}
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static void free_dup_event(struct ordered_events *oe, union perf_event *event)
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{
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if (oe->copy_on_queue) {
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oe->cur_alloc_size -= event->header.size;
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free(event);
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}
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}
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#define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct ordered_event))
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static struct ordered_event *alloc_event(struct ordered_events *oe,
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union perf_event *event)
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{
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struct list_head *cache = &oe->cache;
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struct ordered_event *new = NULL;
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union perf_event *new_event;
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new_event = dup_event(oe, event);
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if (!new_event)
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return NULL;
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if (!list_empty(cache)) {
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new = list_entry(cache->next, struct ordered_event, list);
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list_del(&new->list);
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} else if (oe->buffer) {
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new = oe->buffer + oe->buffer_idx;
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if (++oe->buffer_idx == MAX_SAMPLE_BUFFER)
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oe->buffer = NULL;
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} else if (oe->cur_alloc_size < oe->max_alloc_size) {
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size_t size = MAX_SAMPLE_BUFFER * sizeof(*new);
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oe->buffer = malloc(size);
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if (!oe->buffer) {
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free_dup_event(oe, new_event);
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return NULL;
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}
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pr("alloc size %" PRIu64 "B (+%zu), max %" PRIu64 "B\n",
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oe->cur_alloc_size, size, oe->max_alloc_size);
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oe->cur_alloc_size += size;
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list_add(&oe->buffer->list, &oe->to_free);
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/* First entry is abused to maintain the to_free list. */
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oe->buffer_idx = 2;
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new = oe->buffer + 1;
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} else {
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pr("allocation limit reached %" PRIu64 "B\n", oe->max_alloc_size);
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}
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new->event = new_event;
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return new;
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}
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static struct ordered_event *
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ordered_events__new_event(struct ordered_events *oe, u64 timestamp,
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union perf_event *event)
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{
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struct ordered_event *new;
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new = alloc_event(oe, event);
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if (new) {
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new->timestamp = timestamp;
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queue_event(oe, new);
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}
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return new;
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}
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void ordered_events__delete(struct ordered_events *oe, struct ordered_event *event)
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{
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list_move(&event->list, &oe->cache);
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oe->nr_events--;
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free_dup_event(oe, event->event);
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}
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int ordered_events__queue(struct ordered_events *oe, union perf_event *event,
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struct perf_sample *sample, u64 file_offset)
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{
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u64 timestamp = sample->time;
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struct ordered_event *oevent;
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if (!timestamp || timestamp == ~0ULL)
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return -ETIME;
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if (timestamp < oe->last_flush) {
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pr_oe_time(timestamp, "out of order event\n");
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pr_oe_time(oe->last_flush, "last flush, last_flush_type %d\n",
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oe->last_flush_type);
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oe->nr_unordered_events++;
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}
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oevent = ordered_events__new_event(oe, timestamp, event);
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if (!oevent) {
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ordered_events__flush(oe, OE_FLUSH__HALF);
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oevent = ordered_events__new_event(oe, timestamp, event);
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}
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if (!oevent)
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return -ENOMEM;
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oevent->file_offset = file_offset;
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return 0;
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}
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static int __ordered_events__flush(struct ordered_events *oe)
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{
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struct list_head *head = &oe->events;
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struct ordered_event *tmp, *iter;
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u64 limit = oe->next_flush;
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u64 last_ts = oe->last ? oe->last->timestamp : 0ULL;
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bool show_progress = limit == ULLONG_MAX;
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struct ui_progress prog;
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int ret;
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if (!limit)
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return 0;
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if (show_progress)
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ui_progress__init(&prog, oe->nr_events, "Processing time ordered events...");
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list_for_each_entry_safe(iter, tmp, head, list) {
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if (session_done())
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return 0;
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if (iter->timestamp > limit)
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break;
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ret = oe->deliver(oe, iter);
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if (ret)
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return ret;
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ordered_events__delete(oe, iter);
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oe->last_flush = iter->timestamp;
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if (show_progress)
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ui_progress__update(&prog, 1);
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}
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if (list_empty(head))
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oe->last = NULL;
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else if (last_ts <= limit)
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oe->last = list_entry(head->prev, struct ordered_event, list);
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if (show_progress)
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ui_progress__finish();
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return 0;
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}
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int ordered_events__flush(struct ordered_events *oe, enum oe_flush how)
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{
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static const char * const str[] = {
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"NONE",
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"FINAL",
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"ROUND",
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"HALF ",
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};
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int err;
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if (oe->nr_events == 0)
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return 0;
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switch (how) {
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case OE_FLUSH__FINAL:
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oe->next_flush = ULLONG_MAX;
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break;
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case OE_FLUSH__HALF:
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{
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struct ordered_event *first, *last;
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struct list_head *head = &oe->events;
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first = list_entry(head->next, struct ordered_event, list);
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last = oe->last;
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/* Warn if we are called before any event got allocated. */
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if (WARN_ONCE(!last || list_empty(head), "empty queue"))
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return 0;
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oe->next_flush = first->timestamp;
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oe->next_flush += (last->timestamp - first->timestamp) / 2;
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break;
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}
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case OE_FLUSH__ROUND:
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case OE_FLUSH__NONE:
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default:
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break;
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};
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pr_oe_time(oe->next_flush, "next_flush - ordered_events__flush PRE %s, nr_events %u\n",
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str[how], oe->nr_events);
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pr_oe_time(oe->max_timestamp, "max_timestamp\n");
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err = __ordered_events__flush(oe);
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if (!err) {
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if (how == OE_FLUSH__ROUND)
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oe->next_flush = oe->max_timestamp;
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oe->last_flush_type = how;
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}
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pr_oe_time(oe->next_flush, "next_flush - ordered_events__flush POST %s, nr_events %u\n",
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str[how], oe->nr_events);
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pr_oe_time(oe->last_flush, "last_flush\n");
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return err;
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}
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void ordered_events__init(struct ordered_events *oe, ordered_events__deliver_t deliver)
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{
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INIT_LIST_HEAD(&oe->events);
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INIT_LIST_HEAD(&oe->cache);
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INIT_LIST_HEAD(&oe->to_free);
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oe->max_alloc_size = (u64) -1;
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oe->cur_alloc_size = 0;
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oe->deliver = deliver;
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}
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void ordered_events__free(struct ordered_events *oe)
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{
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while (!list_empty(&oe->to_free)) {
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struct ordered_event *event;
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event = list_entry(oe->to_free.next, struct ordered_event, list);
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list_del(&event->list);
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free_dup_event(oe, event->event);
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free(event);
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}
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}
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