| Pu Hou | a3f22d5 | 2016-09-01 10:48:22 +0200 | [diff] [blame^] | 1 | #include <stdbool.h> |
| 2 | #include <linux/kernel.h> |
| 3 | #include <linux/types.h> |
| 4 | #include <linux/bitops.h> |
| 5 | #include <linux/log2.h> |
| 6 | |
| 7 | #include "../../util/evlist.h" |
| 8 | #include "../../util/auxtrace.h" |
| 9 | #include "../../util/evsel.h" |
| 10 | |
| 11 | #define PERF_EVENT_CPUM_SF 0xB0000 /* Event: Basic-sampling */ |
| 12 | #define PERF_EVENT_CPUM_SF_DIAG 0xBD000 /* Event: Combined-sampling */ |
| 13 | #define DEFAULT_AUX_PAGES 128 |
| 14 | #define DEFAULT_FREQ 4000 |
| 15 | |
| 16 | static void cpumsf_free(struct auxtrace_record *itr) |
| 17 | { |
| 18 | free(itr); |
| 19 | } |
| 20 | |
| 21 | static size_t cpumsf_info_priv_size(struct auxtrace_record *itr __maybe_unused, |
| 22 | struct perf_evlist *evlist __maybe_unused) |
| 23 | { |
| 24 | return 0; |
| 25 | } |
| 26 | |
| 27 | static int |
| 28 | cpumsf_info_fill(struct auxtrace_record *itr __maybe_unused, |
| 29 | struct perf_session *session __maybe_unused, |
| 30 | struct auxtrace_info_event *auxtrace_info __maybe_unused, |
| 31 | size_t priv_size __maybe_unused) |
| 32 | { |
| 33 | return 0; |
| 34 | } |
| 35 | |
| 36 | static unsigned long |
| 37 | cpumsf_reference(struct auxtrace_record *itr __maybe_unused) |
| 38 | { |
| 39 | return 0; |
| 40 | } |
| 41 | |
| 42 | static int |
| 43 | cpumsf_recording_options(struct auxtrace_record *ar __maybe_unused, |
| 44 | struct perf_evlist *evlist __maybe_unused, |
| 45 | struct record_opts *opts) |
| 46 | { |
| 47 | unsigned int factor = 1; |
| 48 | unsigned int pages; |
| 49 | |
| 50 | opts->full_auxtrace = true; |
| 51 | |
| 52 | /* |
| 53 | * The AUX buffer size should be set properly to avoid |
| 54 | * overflow of samples if it is not set explicitly. |
| 55 | * DEFAULT_AUX_PAGES is an proper size when sampling frequency |
| 56 | * is DEFAULT_FREQ. It is expected to hold about 1/2 second |
| 57 | * of sampling data. The size used for AUX buffer will scale |
| 58 | * according to the specified frequency and DEFAULT_FREQ. |
| 59 | */ |
| 60 | if (!opts->auxtrace_mmap_pages) { |
| 61 | if (opts->user_freq != UINT_MAX) |
| 62 | factor = (opts->user_freq + DEFAULT_FREQ |
| 63 | - 1) / DEFAULT_FREQ; |
| 64 | pages = DEFAULT_AUX_PAGES * factor; |
| 65 | opts->auxtrace_mmap_pages = roundup_pow_of_two(pages); |
| 66 | } |
| 67 | |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | static int |
| 72 | cpumsf_parse_snapshot_options(struct auxtrace_record *itr __maybe_unused, |
| 73 | struct record_opts *opts __maybe_unused, |
| 74 | const char *str __maybe_unused) |
| 75 | { |
| 76 | return 0; |
| 77 | } |
| 78 | |
| 79 | /* |
| 80 | * auxtrace_record__init is called when perf record |
| 81 | * check if the event really need auxtrace |
| 82 | */ |
| 83 | struct auxtrace_record *auxtrace_record__init(struct perf_evlist *evlist, |
| 84 | int *err) |
| 85 | { |
| 86 | struct auxtrace_record *aux; |
| 87 | struct perf_evsel *pos; |
| 88 | int diagnose = 0; |
| 89 | |
| 90 | if (evlist->nr_entries == 0) |
| 91 | return NULL; |
| 92 | |
| 93 | evlist__for_each_entry(evlist, pos) { |
| 94 | if (pos->attr.config == PERF_EVENT_CPUM_SF_DIAG) { |
| 95 | diagnose = 1; |
| 96 | break; |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | if (!diagnose) |
| 101 | return NULL; |
| 102 | |
| 103 | /* sampling in diagnose mode. alloc aux buffer */ |
| 104 | aux = zalloc(sizeof(*aux)); |
| 105 | if (aux == NULL) { |
| 106 | *err = -ENOMEM; |
| 107 | return NULL; |
| 108 | } |
| 109 | |
| 110 | aux->parse_snapshot_options = cpumsf_parse_snapshot_options; |
| 111 | aux->recording_options = cpumsf_recording_options; |
| 112 | aux->info_priv_size = cpumsf_info_priv_size; |
| 113 | aux->info_fill = cpumsf_info_fill; |
| 114 | aux->free = cpumsf_free; |
| 115 | aux->reference = cpumsf_reference; |
| 116 | |
| 117 | return aux; |
| 118 | } |