diff options
Diffstat (limited to 'tools/perf/util/evsel.c')
| -rw-r--r-- | tools/perf/util/evsel.c | 37 |
1 files changed, 23 insertions, 14 deletions
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 4a5947625c5c..7fb4ae82f34c 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -35,10 +35,11 @@ #include "debug.h" #include "trace-event.h" #include "stat.h" +#include "string2.h" #include "memswap.h" #include "util/parse-branch-options.h" -#include "sane_ctype.h" +#include <linux/ctype.h> struct perf_missing_features perf_missing_features; @@ -589,6 +590,9 @@ const char *perf_evsel__name(struct perf_evsel *evsel) { char bf[128]; + if (!evsel) + goto out_unknown; + if (evsel->name) return evsel->name; @@ -628,7 +632,10 @@ const char *perf_evsel__name(struct perf_evsel *evsel) evsel->name = strdup(bf); - return evsel->name ?: "unknown"; + if (evsel->name) + return evsel->name; +out_unknown: + return "unknown"; } const char *perf_evsel__group_name(struct perf_evsel *evsel) @@ -679,6 +686,10 @@ static void __perf_evsel__config_callchain(struct perf_evsel *evsel, attr->sample_max_stack = param->max_stack; + if (opts->kernel_callchains) + attr->exclude_callchain_user = 1; + if (opts->user_callchains) + attr->exclude_callchain_kernel = 1; if (param->record_mode == CALLCHAIN_LBR) { if (!opts->branch_stack) { if (attr->exclude_user) { @@ -701,7 +712,14 @@ static void __perf_evsel__config_callchain(struct perf_evsel *evsel, if (!function) { perf_evsel__set_sample_bit(evsel, REGS_USER); perf_evsel__set_sample_bit(evsel, STACK_USER); - attr->sample_regs_user |= PERF_REGS_MASK; + if (opts->sample_user_regs && DWARF_MINIMAL_REGS != PERF_REGS_MASK) { + attr->sample_regs_user |= DWARF_MINIMAL_REGS; + pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, " + "specifying a subset with --user-regs may render DWARF unwinding unreliable, " + "so the minimal registers set (IP, SP) is explicitly forced.\n"); + } else { + attr->sample_regs_user |= PERF_REGS_MASK; + } attr->sample_stack_user = param->dump_size; attr->exclude_callchain_user = 1; } else { @@ -1136,9 +1154,6 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts, static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads) { - if (evsel->system_wide) - nthreads = 1; - evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int)); if (evsel->fd) { @@ -1785,14 +1800,8 @@ static int perf_event_open(struct perf_evsel *evsel, if (fd >= 0) break; - /* - * Do quick precise_ip fallback if: - * - there is precise_ip set in perf_event_attr - * - maximum precise is requested - * - sys_perf_event_open failed with ENOTSUP error, - * which is associated with wrong precise_ip - */ - if (!precise_ip || !evsel->precise_max || (errno != ENOTSUP)) + /* Do not try less precise if not requested. */ + if (!evsel->precise_max) break; /* |