/* * sampleip: sample instruction pointer and frequency count in a BPF map. * * Copyright 2016 Netflix, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include #include #include #include #include "libbpf.h" #include "bpf_load.h" #include "perf-sys.h" #define DEFAULT_FREQ 99 #define DEFAULT_SECS 5 #define MAX_IPS 8192 #define PAGE_OFFSET 0xffff880000000000 static int nr_cpus; static void usage(void) { printf("USAGE: sampleip [-F freq] [duration]\n"); printf(" -F freq # sample frequency (Hertz), default 99\n"); printf(" duration # sampling duration (seconds), default 5\n"); } static int sampling_start(int *pmu_fd, int freq) { int i; struct perf_event_attr pe_sample_attr = { .type = PERF_TYPE_SOFTWARE, .freq = 1, .sample_period = freq, .config = PERF_COUNT_SW_CPU_CLOCK, .inherit = 1, }; for (i = 0; i < nr_cpus; i++) { pmu_fd[i] = sys_perf_event_open(&pe_sample_attr, -1 /* pid */, i, -1 /* group_fd */, 0 /* flags */); if (pmu_fd[i] < 0) { fprintf(stderr, "ERROR: Initializing perf sampling\n"); return 1; } assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0); assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE, 0) == 0); } return 0; } static void sampling_end(int *pmu_fd) { int i; for (i = 0; i < nr_cpus; i++) close(pmu_fd[i]); } struct ipcount { __u64 ip; __u32 count; }; /* used for sorting */ struct ipcount counts[MAX_IPS]; static int count_cmp(const void *p1, const void *p2) { return ((struct ipcount *)p1)->count - ((struct ipcount *)p2)->count; } static void print_ip_map(int fd) { struct ksym *sym; __u64 key, next_key; __u32 value; int i, max; printf("%-19s %-32s %s\n", "ADDR", "KSYM", "COUNT"); /* fetch IPs and counts */ key = 0, i = 0; while (bpf_map_get_next_key(fd, &key, &next_key) == 0) { bpf_map_lookup_elem(fd, &next_key, &value); counts[i].ip = next_key; counts[i++].count = value; key = next_key; } max = i; /* sort and print */ qsort(counts, max, sizeof(struct ipcount), count_cmp); for (i = 0; i < max; i++) { if (counts[i].ip > PAGE_OFFSET) { sym = ksym_search(counts[i].ip); printf("0x%-17llx %-32s %u\n", counts[i].ip, sym->name, counts[i].count); } else { printf("0x%-17llx %-32s %u\n", counts[i].ip, "(user)", counts[i].count); } } if (max == MAX_IPS) { printf("WARNING: IP hash was full (max %d entries); ", max); printf("may have dropped samples\n"); } } static void int_exit(int sig) { printf("\n"); print_ip_map(map_fd[0]); exit(0); } int main(int argc, char **argv) { char filename[256]; int *pmu_fd, opt, freq = DEFAULT_FREQ, secs = DEFAULT_SECS; /* process arguments */ while ((opt = getopt(argc, argv, "F:h")) != -1) { switch (opt) { case 'F': freq = atoi(optarg); break; case 'h': default: usage(); return 0; } } if (argc - optind == 1) secs = atoi(argv[optind]); if (freq == 0 || secs == 0) { usage(); return 1; } /* initialize kernel symbol translation */ if (load_kallsyms()) { fprintf(stderr, "ERROR: loading /proc/kallsyms\n"); return 2; } /* create perf FDs for each CPU */ nr_cpus = sysconf(_SC_NPROCESSORS_CONF); pmu_fd = malloc(nr_cpus * sizeof(int)); if (pmu_fd == NULL) { fprintf(stderr, "ERROR: malloc of pmu_fd\n"); return 1; } /* load BPF program */ snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); if (load_bpf_file(filename)) { fprintf(stderr, "ERROR: loading BPF program (errno %d):\n", errno); if (strcmp(bpf_log_buf, "") == 0) fprintf(stderr, "Try: ulimit -l unlimited\n"); else fprintf(stderr, "%s", bpf_log_buf); return 1; } signal(SIGINT, int_exit); /* do sampling */ printf("Sampling at %d Hertz for %d seconds. Ctrl-C also ends.\n", freq, secs); if (sampling_start(pmu_fd, freq) != 0) return 1; sleep(secs); sampling_end(pmu_fd); free(pmu_fd); /* output sample counts */ print_ip_map(map_fd[0]); return 0; } td class='ctrl'>mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2017-02-03 13:46:38 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-03 13:46:38 -0800
commit3f67790d2b7e322bcf363ec717085dd78c3ea7cd (patch)
tree7be20232078a2e801ed93bcdb72f0d955dd9836f /drivers/usb/gadget/udc/at91_udc.c
parentcd44691f7177b2c1e1509d1a17d9b198ebaa34eb (diff)
parent206c4720092d2a24bfefc041b377e889a220ffbf (diff)
Merge tag 'regulator-fix-v4.10-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator
Pull regulator fixes from Mark Brown: "Three changes here: two run of the mill driver specific fixes and a change from Mark Rutland which reverts some new device specific ACPI binding code which was added during the merge window as there are concerns about this sending the wrong signal about usage of regulators in ACPI systems" * tag 'regulator-fix-v4.10-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator: regulator: fixed: Revert support for ACPI interface regulator: axp20x: AXP806: Fix dcdcb being set instead of dcdce regulator: twl6030: fix range comparison, allowing vsel = 59
Diffstat (limited to 'drivers/usb/gadget/udc/at91_udc.c')