125 lines
3.0 KiB
C
125 lines
3.0 KiB
C
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#include <stdbool.h>
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#include <stdlib.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/bitops.h>
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#include <linux/log2.h>
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#include <linux/zalloc.h>
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#include "../../util/evlist.h"
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#include "../../util/auxtrace.h"
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#include "../../util/evsel.h"
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#include "../../util/record.h"
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#define PERF_EVENT_CPUM_SF 0xB0000 /* Event: Basic-sampling */
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#define PERF_EVENT_CPUM_SF_DIAG 0xBD000 /* Event: Combined-sampling */
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#define DEFAULT_AUX_PAGES 128
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#define DEFAULT_FREQ 4000
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static void cpumsf_free(struct auxtrace_record *itr)
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{
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free(itr);
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}
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static size_t cpumsf_info_priv_size(struct auxtrace_record *itr __maybe_unused,
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struct evlist *evlist __maybe_unused)
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{
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return 0;
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}
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static int
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cpumsf_info_fill(struct auxtrace_record *itr __maybe_unused,
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struct perf_session *session __maybe_unused,
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struct perf_record_auxtrace_info *auxtrace_info __maybe_unused,
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size_t priv_size __maybe_unused)
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{
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auxtrace_info->type = PERF_AUXTRACE_S390_CPUMSF;
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return 0;
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}
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static unsigned long
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cpumsf_reference(struct auxtrace_record *itr __maybe_unused)
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{
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return 0;
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}
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static int
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cpumsf_recording_options(struct auxtrace_record *ar __maybe_unused,
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struct evlist *evlist __maybe_unused,
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struct record_opts *opts)
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{
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unsigned int factor = 1;
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unsigned int pages;
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opts->full_auxtrace = true;
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/*
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* The AUX buffer size should be set properly to avoid
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* overflow of samples if it is not set explicitly.
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* DEFAULT_AUX_PAGES is an proper size when sampling frequency
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* is DEFAULT_FREQ. It is expected to hold about 1/2 second
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* of sampling data. The size used for AUX buffer will scale
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* according to the specified frequency and DEFAULT_FREQ.
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*/
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if (!opts->auxtrace_mmap_pages) {
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if (opts->user_freq != UINT_MAX)
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factor = (opts->user_freq + DEFAULT_FREQ
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- 1) / DEFAULT_FREQ;
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pages = DEFAULT_AUX_PAGES * factor;
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opts->auxtrace_mmap_pages = roundup_pow_of_two(pages);
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}
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return 0;
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}
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static int
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cpumsf_parse_snapshot_options(struct auxtrace_record *itr __maybe_unused,
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struct record_opts *opts __maybe_unused,
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const char *str __maybe_unused)
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{
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return 0;
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}
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/*
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* auxtrace_record__init is called when perf record
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* check if the event really need auxtrace
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*/
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struct auxtrace_record *auxtrace_record__init(struct evlist *evlist,
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int *err)
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{
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struct auxtrace_record *aux;
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struct evsel *pos;
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int diagnose = 0;
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*err = 0;
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if (evlist->core.nr_entries == 0)
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return NULL;
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evlist__for_each_entry(evlist, pos) {
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if (pos->core.attr.config == PERF_EVENT_CPUM_SF_DIAG) {
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diagnose = 1;
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pos->needs_auxtrace_mmap = true;
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break;
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}
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}
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if (!diagnose)
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return NULL;
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/* sampling in diagnose mode. alloc aux buffer */
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aux = zalloc(sizeof(*aux));
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if (aux == NULL) {
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*err = -ENOMEM;
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return NULL;
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}
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aux->parse_snapshot_options = cpumsf_parse_snapshot_options;
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aux->recording_options = cpumsf_recording_options;
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aux->info_priv_size = cpumsf_info_priv_size;
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aux->info_fill = cpumsf_info_fill;
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aux->free = cpumsf_free;
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aux->reference = cpumsf_reference;
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return aux;
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}
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