1 // SPDX-License-Identifier: GPL-2.0
3 * dlfilter-show-cycles.c: Print the number of cycles at the start of each line
4 * Copyright (c) 2021, Intel Corporation.
6 #include <perf/perf_dlfilter.h>
19 static __u64 cycles[MAX_CPU][MAX_ENTRY];
20 static __u64 cycles_rpt[MAX_CPU][MAX_ENTRY];
23 #define TABLESZ (1 << BITS)
24 #define TABLEMAX (TABLESZ / 2)
25 #define MASK (TABLESZ - 1)
30 __u64 cycles[MAX_ENTRY];
31 __u64 cycles_rpt[MAX_ENTRY];
36 static int event_entry(const char *event)
40 if (!strncmp(event, "instructions", 12))
42 if (!strncmp(event, "branches", 8))
47 static struct entry *find_entry(__s32 tid)
49 __u32 pos = tid & MASK;
61 if (tid_cnt >= TABLEMAX) {
62 fprintf(stderr, "Too many threads\n");
72 static void add_entry(__s32 tid, int pos, __u64 cnt)
74 struct entry *e = find_entry(tid);
77 e->cycles[pos] += cnt;
80 int filter_event_early(void *data, const struct perf_dlfilter_sample *sample, void *ctx)
82 __s32 cpu = sample->cpu;
83 __s32 tid = sample->tid;
89 pos = event_entry(sample->event);
91 if (cpu >= 0 && cpu < MAX_CPU)
92 cycles[cpu][pos] += sample->cyc_cnt;
94 add_entry(tid, pos, sample->cyc_cnt);
98 static void print_vals(__u64 cycles, __u64 delta)
101 printf("%10llu %10llu ", (unsigned long long)cycles, (unsigned long long)delta);
103 printf("%10llu %10s ", (unsigned long long)cycles, "");
106 int filter_event(void *data, const struct perf_dlfilter_sample *sample, void *ctx)
108 __s32 cpu = sample->cpu;
109 __s32 tid = sample->tid;
112 pos = event_entry(sample->event);
114 if (cpu >= 0 && cpu < MAX_CPU) {
115 print_vals(cycles[cpu][pos], cycles[cpu][pos] - cycles_rpt[cpu][pos]);
116 cycles_rpt[cpu][pos] = cycles[cpu][pos];
121 struct entry *e = find_entry(tid);
124 print_vals(e->cycles[pos], e->cycles[pos] - e->cycles_rpt[pos]);
125 e->cycles_rpt[pos] = e->cycles[pos];
134 const char *filter_description(const char **long_description)
136 static char *long_desc = "Cycle counts are accumulated per CPU (or "
137 "per thread if CPU is not recorded) from IPC information, and "
138 "printed together with the change since the last print, at the "
139 "start of each line. Separate counts are kept for branches, "
140 "instructions or other events.";
142 *long_description = long_desc;
143 return "Print the number of cycles at the start of each line";