diff options
Diffstat (limited to 'src/vppinfra/perfmon/perfmon.c')
| -rw-r--r-- | src/vppinfra/perfmon/perfmon.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/src/vppinfra/perfmon/perfmon.c b/src/vppinfra/perfmon/perfmon.c new file mode 100644 index 00000000000..f44f225a86c --- /dev/null +++ b/src/vppinfra/perfmon/perfmon.c @@ -0,0 +1,230 @@ +/* SPDX-License-Identifier: Apache-2.0 + * Copyright(c) 2022 Cisco Systems, Inc. + */ + +#include <vppinfra/format.h> +#include <vppinfra/error.h> +#include <vppinfra/perfmon/perfmon.h> +#include <vppinfra/format_table.h> + +clib_perfmon_main_t clib_perfmon_main; + +__clib_export clib_error_t * +clib_perfmon_init_by_bundle_name (clib_perfmon_ctx_t *ctx, char *fmt, ...) +{ + clib_perfmon_main_t *pm = &clib_perfmon_main; + clib_perfmon_bundle_t *b = 0; + int group_fd = -1; + clib_error_t *err = 0; + va_list va; + char *bundle_name; + + struct perf_event_attr pe = { + .size = sizeof (struct perf_event_attr), + .disabled = 1, + .exclude_kernel = 1, + .exclude_hv = 1, + .pinned = 1, + .exclusive = 1, + .read_format = (PERF_FORMAT_GROUP | PERF_FORMAT_TOTAL_TIME_ENABLED | + PERF_FORMAT_TOTAL_TIME_RUNNING), + }; + + va_start (va, fmt); + bundle_name = (char *) va_format (0, fmt, &va); + va_end (va); + vec_add1 (bundle_name, 0); + + for (clib_perfmon_bundle_reg_t *r = pm->bundle_regs; r; r = r->next) + { + if (strncmp (r->bundle->name, bundle_name, vec_len (bundle_name) - 1)) + continue; + b = r->bundle; + break; + } + + if (b == 0) + { + err = clib_error_return (0, "Unknown bundle '%s'", bundle_name); + goto done; + } + + clib_memset_u8 (ctx, 0, sizeof (clib_perfmon_ctx_t)); + vec_validate_init_empty (ctx->fds, b->n_events - 1, -1); + ctx->bundle = b; + + for (int i = 0; i < b->n_events; i++) + { + pe.config = b->config[i]; + pe.type = b->type; + int fd = syscall (__NR_perf_event_open, &pe, /* pid */ 0, /* cpu */ -1, + /* group_fd */ group_fd, /* flags */ 0); + if (fd < 0) + { + err = clib_error_return_unix (0, "perf_event_open[%u]", i); + goto done; + } + + if (ctx->debug) + fformat (stderr, "perf event %u open, fd %d\n", i, fd); + + if (group_fd == -1) + { + group_fd = fd; + pe.pinned = 0; + pe.exclusive = 0; + } + + ctx->fds[i] = fd; + } + + ctx->group_fd = group_fd; + ctx->data = vec_new (u64, 3 + b->n_events); + ctx->ref_clock = os_cpu_clock_frequency (); + vec_validate (ctx->capture_groups, 0); + +done: + if (err) + clib_perfmon_free (ctx); + + vec_free (bundle_name); + return err; +} + +__clib_export void +clib_perfmon_free (clib_perfmon_ctx_t *ctx) +{ + clib_perfmon_clear (ctx); + vec_free (ctx->captures); + vec_free (ctx->capture_groups); + + for (int i = 0; i < vec_len (ctx->fds); i++) + if (ctx->fds[i] > -1) + close (ctx->fds[i]); + vec_free (ctx->fds); + vec_free (ctx->data); +} + +__clib_export void +clib_perfmon_clear (clib_perfmon_ctx_t *ctx) +{ + for (int i = 0; i < vec_len (ctx->captures); i++) + vec_free (ctx->captures[i].desc); + vec_reset_length (ctx->captures); + for (int i = 0; i < vec_len (ctx->capture_groups); i++) + vec_free (ctx->capture_groups[i].name); + vec_reset_length (ctx->capture_groups); +} + +__clib_export u64 * +clib_perfmon_capture (clib_perfmon_ctx_t *ctx, u32 n_ops, char *fmt, ...) +{ + u32 read_size = (ctx->bundle->n_events + 3) * sizeof (u64); + clib_perfmon_capture_t *c; + u64 d[CLIB_PERFMON_MAX_EVENTS + 3]; + va_list va; + + if ((read (ctx->group_fd, d, read_size) != read_size)) + { + if (ctx->debug) + fformat (stderr, "reading of %u bytes failed, %s (%d)\n", read_size, + strerror (errno), errno); + return 0; + } + + if (ctx->debug) + { + fformat (stderr, "read events: %lu enabled: %lu running: %lu ", d[0], + d[1], d[2]); + fformat (stderr, "data: [%lu", d[3]); + for (int i = 1; i < ctx->bundle->n_events; i++) + fformat (stderr, ", %lu", d[i + 3]); + fformat (stderr, "]\n"); + } + + vec_add2 (ctx->captures, c, 1); + + va_start (va, fmt); + c->desc = va_format (0, fmt, &va); + va_end (va); + + c->n_ops = n_ops; + c->group = vec_len (ctx->capture_groups) - 1; + c->time_enabled = d[1]; + c->time_running = d[2]; + for (int i = 0; i < CLIB_PERFMON_MAX_EVENTS; i++) + c->data[i] = d[i + 3]; + + return ctx->data + vec_len (ctx->data) - ctx->bundle->n_events; +} + +__clib_export void +clib_perfmon_capture_group (clib_perfmon_ctx_t *ctx, char *fmt, ...) +{ + clib_perfmon_capture_group_t *cg; + va_list va; + + cg = vec_end (ctx->capture_groups) - 1; + + if (cg->name != 0) + vec_add2 (ctx->capture_groups, cg, 1); + + va_start (va, fmt); + cg->name = va_format (0, fmt, &va); + va_end (va); + ASSERT (cg->name); +} + +__clib_export void +clib_perfmon_warmup (clib_perfmon_ctx_t *ctx) +{ + for (u64 i = 0; i < (u64) ctx->ref_clock; i++) + asm volatile("" : : "r"(i * i) : "memory"); +} + +__clib_export u8 * +format_perfmon_bundle (u8 *s, va_list *args) +{ + clib_perfmon_ctx_t *ctx = va_arg (*args, clib_perfmon_ctx_t *); + clib_perfmon_capture_t *c; + clib_perfmon_capture_group_t *cg = 0; + char **hdr = ctx->bundle->column_headers; + table_t _t = {}, *t = &_t; + u32 n_row = 0, col = 0; + + table_add_header_row (t, 0); + + for (char **h = ctx->bundle->column_headers; h[0]; h++) + n_row++; + + vec_foreach (c, ctx->captures) + { + if (cg != ctx->capture_groups + c->group) + { + cg = ctx->capture_groups + c->group; + table_format_cell (t, col, -1, "%v", cg->name); + table_set_cell_align (t, col, -1, TTAA_LEFT); + table_set_cell_fg_color (t, col, -1, TTAC_BRIGHT_RED); + + table_format_cell (t, col, 0, "Ops"); + table_set_cell_fg_color (t, col, 0, TTAC_BRIGHT_YELLOW); + + for (int i = 0; i < n_row; i++) + { + table_format_cell (t, col, i + 1, "%s", hdr[i]); + table_set_cell_fg_color (t, col, i + 1, TTAC_BRIGHT_YELLOW); + } + col++; + } + table_format_cell (t, col, -1, "%v", c->desc); + table_format_cell (t, col, 0, "%7u", c->n_ops); + for (int i = 0; i < n_row; i++) + table_format_cell (t, col, i + 1, "%U", ctx->bundle->format_fn, ctx, c, + i); + col++; + } + + s = format (s, "%U", format_table, t); + table_free (t); + return s; +} |