diff options
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/builtin-record.c | 7 | ||||
| -rw-r--r-- | tools/perf/design.txt | 15 | ||||
| -rw-r--r-- | tools/perf/perf.h | 5 | ||||
| -rw-r--r-- | tools/perf/util/parse-events.c | 2 |
4 files changed, 24 insertions, 5 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 29259e7..0f5771f 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -568,8 +568,11 @@ int cmd_record(int argc, const char **argv, const char *prefix) if (!argc && target_pid == -1 && !system_wide) usage_with_options(record_usage, options); - if (!nr_counters) - nr_counters = 1; + if (!nr_counters) { + nr_counters = 1; + attrs[0].type = PERF_TYPE_HARDWARE; + attrs[0].config = PERF_COUNT_HW_CPU_CYCLES; + } for (counter = 0; counter < nr_counters; counter++) { if (attrs[counter].sample_period) diff --git a/tools/perf/design.txt b/tools/perf/design.txt index 860e116..f71e0d2 100644 --- a/tools/perf/design.txt +++ b/tools/perf/design.txt @@ -440,3 +440,18 @@ by this process or by another, and doesn't affect any counters that this process has created on other processes. It only enables or disables the group leaders, not any other members in the groups. + +Arch requirements +----------------- + +If your architecture does not have hardware performance metrics, you can +still use the generic software counters based on hrtimers for sampling. + +So to start with, in order to add HAVE_PERF_COUNTERS to your Kconfig, you +will need at least this: + - asm/perf_counter.h - a basic stub will suffice at first + - support for atomic64 types (and associated helper functions) + - set_perf_counter_pending() implemented + +If your architecture does have hardware capabilities, you can override the +weak stub hw_perf_counter_init() to register hardware counters. diff --git a/tools/perf/perf.h b/tools/perf/perf.h index af0a504..87a1aca 100644 --- a/tools/perf/perf.h +++ b/tools/perf/perf.h @@ -53,11 +53,12 @@ static inline unsigned long long rdclock(void) _min1 < _min2 ? _min1 : _min2; }) static inline int -sys_perf_counter_open(struct perf_counter_attr *attr_uptr, +sys_perf_counter_open(struct perf_counter_attr *attr, pid_t pid, int cpu, int group_fd, unsigned long flags) { - return syscall(__NR_perf_counter_open, attr_uptr, pid, cpu, + attr->size = sizeof(*attr); + return syscall(__NR_perf_counter_open, attr, pid, cpu, group_fd, flags); } diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index 9d5f1ca..5a72586 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -75,7 +75,7 @@ static char *sw_event_names[] = { #define MAX_ALIASES 8 static char *hw_cache [][MAX_ALIASES] = { - { "L1-data" , "l1-d", "l1d", "l1" }, + { "L1-data" , "l1-d", "l1d" }, { "L1-instruction" , "l1-i", "l1i" }, { "L2" , "l2" }, { "Data-TLB" , "dtlb", "d-tlb" }, |