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pfunct: Use load stealer to speed up --class 

We were loading everything to then iterate looking for functions with
pointers to the --class argument, do it in the stealer and go on
ditching the already processed data, greatly speeding up the process.

  $ pfunct -c perf_event_attr
  security_perf_event_open
  register_user_hw_breakpoint
  modify_user_hw_breakpoint
  perf_event_create_kernel_counter
  register_wide_hw_breakpoint
  bpf_lsm_perf_event_open
  modify_user_hw_breakpoint_check
  perf_event_create_kernel_counter
  $
  $
  $ pfunct bpf_lsm_perf_event_open
  int bpf_lsm_perf_event_open(struct perf_event_attr * attr, int type);
  $

  $ for function in `pfunct -c perf_event_attr` ; do pfunct $function ; done
  int security_perf_event_open(struct perf_event_attr * attr, int type);
  struct perf_event * register_user_hw_breakpoint(struct perf_event_attr * attr, perf_overflow_handler_t triggered, void * context, struct task_struct * tsk);
  int modify_user_hw_breakpoint(struct perf_event * bp, struct perf_event_attr * attr);
  struct perf_event * perf_event_create_kernel_counter(struct perf_event_attr * attr, int cpu, struct task_struct * task, perf_overflow_handler_t callback, void * context);
  struct perf_event * * register_wide_hw_breakpoint(struct perf_event_attr * attr, perf_overflow_handler_t triggered, void * context);
  int bpf_lsm_perf_event_open(struct perf_event_attr * attr, int type);
  int modify_user_hw_breakpoint_check(struct perf_event * bp, struct perf_event_attr * attr, bool check);
  struct perf_event * perf_event_create_kernel_counter(struct perf_event_attr * attr, int cpu, struct task_struct * task, perf_overflow_handler_t callback, void * context);
  $

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2020-11-16 08:15:23 -03:00
parent aa8fb8c091
commit 25753e0396
1 changed files with 4 additions and 4 deletions
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8
pfunct.c
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@ -33,6 +33,7 @@ static bool expand_types;
static bool compilable_output;
static struct type_emissions emissions;
static uint64_t addr;
static char *class_name;
static char *function_name;
static struct conf_fprintf conf;
@ -505,6 +506,8 @@ static enum load_steal_kind pfunct_stealer(struct cu *cu, struct conf_load *conf
function__show(tag__function(tag), cu);
return LSK__STOP_LOADING;
}
} else if (class_name) {
cu_class_iterator(cu, class_name);
}
return LSK__DELETE;
@ -647,7 +650,6 @@ static const struct argp_option pfunct__options[] = {
};
static void (*formatter)(const struct fn_stats *f) = fn_stats_fmtr;
static char *class_name;
static int show_total_inline_expansion_stats;
static error_t pfunct__options_parser(int key, char *arg,
@ -737,7 +739,7 @@ int main(int argc, char *argv[])
goto out_dwarves_exit;
}
if (function_name)
if (function_name || class_name)
conf_load.steal = pfunct_stealer;
try_sole_arg_as_function_name:
@ -773,8 +775,6 @@ try_sole_arg_as_function_name:
function__show(f, cu);
} else if (show_total_inline_expansion_stats)
print_total_inline_stats();
else if (class_name != NULL)
cus__for_each_cu(cus, cu_class_iterator, class_name, NULL);
else if (function_name != NULL || expand_types)
cus__for_each_cu(cus, cu_function_iterator,
function_name, NULL);