On Wed, Oct 27, 2021 at 12:06:20AM +0200, Daniel Bristot de Oliveira wrote:
> +/*
> + * osnoise_set_cpus - configure osnoise to run on *cpus
> + *
> + * "osnoise/cpus" file is used to set the cpus in which osnoise/timerlat
> + * will run. This function opens this file, saves the current value,
> + * and set the cpus passed as argument.
> + */
> +int osnoise_set_cpus(struct osnoise_context *context, char *cpus)
> +{
> + char *osnoise_cpus = tracefs_get_tracing_file("osnoise/cpus");
> + char curr_cpus[1024];
> + int retval;
> +
> + context->cpus_fd = open(osnoise_cpus, O_RDWR);
> + if (!context->cpus_fd)
> + goto out_err;
The above check should be "context->cpus_fd < 0".
> + retval = read(context->cpus_fd, &curr_cpus, sizeof(curr_cpus));
> + if (!retval)
> + goto out_close;
> + context->orig_cpus = strdup(curr_cpus);
> + if (!context->orig_cpus)
> + goto out_err;
Need to close ->cpus_fd;
if (!context->orig_cpus)
goto out_close;
> + retval = write(context->cpus_fd, cpus, strlen(cpus) + 1);
> + if (!retval)
> + goto out_err;
Same as above. Use "goto out_close" instead.
> + tracefs_put_tracing_file(osnoise_cpus);
> +
> + return 0;
> +
> +out_close:
> + close(context->cpus_fd);
> + context->cpus_fd = -1;
> +out_err:
> + tracefs_put_tracing_file(osnoise_cpus);
> + return 1;
> +}
> +
> +/*
> + * osnoise_restore_cpus - restore the original "osnoise/cpus"
> + *
> + * osnoise_set_cpus() saves the original data for the "osnoise/cpus"
> + * file. This function restore the original config it was previously
> + * modified.
> + */
> +void osnoise_restore_cpus(struct osnoise_context *context)
> +{
> + int retval;
> +
> + if (!context->orig_cpus)
> + return;
> +
> + retval = write(context->cpus_fd, context->orig_cpus, strlen(context->orig_cpus));
__osnoise_write_runtime() check "context->cpus_fd == -1".
Is it possible here we need to check "context->cpus_fd == -1".
> + if (!retval)
> + err_msg("could not restore original osnoise cpus\n");
> +
> + free(context->orig_cpus);
> +}
> +
> +/*
> + * osnoise_get_runtime - return the original "osnoise/runtime_us" value
> + *
> + * It also saves the value to be restored.
> + */
> +unsigned long long osnoise_get_runtime(struct osnoise_context *context)
> +{
> + char buffer[BUFF_U64_STR_SIZE];
> + char *runtime_path;
> + int retval;
> +
> + if (context->runtime_us)
> + return context->runtime_us;
> +
> + runtime_path = tracefs_get_tracing_file("osnoise/runtime_us");
> +
> + context->runtime_fd = open(runtime_path, O_RDWR);
> + if (!context->runtime_fd)
> + goto out_err;
To check context->runtime_fd < 0.
> + retval = read(context->runtime_fd, &buffer, sizeof(buffer));
> + if (!retval)
> + goto out_close;
> +
> + context->runtime_us = get_long_from_str(buffer);
> + if (!context->runtime_us)
> + goto out_close;
> +
> + context->orig_runtime_us = context->runtime_us;
> +
> + tracefs_put_tracing_file(runtime_path);
> +
> + return context->runtime_us;
> +
> +out_close:
> + close(context->runtime_fd);
> + context->runtime_fd = -1;
> +out_err:
> + tracefs_put_tracing_file(runtime_path);
> + return 0;
> +}
> +
> +/*
> + * osnoise_get_period - return the original "osnoise/period_us" value
> + *
> + * It also saves the value to be restored.
> + */
> +unsigned long long osnoise_get_period(struct osnoise_context *context)
> +{
> + char buffer[BUFF_U64_STR_SIZE];
> + char *period_path;
> + int retval;
> +
> + if (context->period_us)
> + return context->period_us;
> +
> + period_path = tracefs_get_tracing_file("osnoise/period_us");
> +
> + context->period_fd = open(period_path, O_RDWR);
> + if (!context->period_fd)
> + goto out_err;
To check context->period_fd < 0.
> + retval = read(context->period_fd, &buffer, sizeof(buffer));
> + if (!retval)
> + goto out_close;
> +
> + context->period_us = get_long_from_str(buffer);
> + if (!context->period_us)
> + goto out_close;
> +
> + context->orig_period_us = context->period_us;
> +
> + tracefs_put_tracing_file(period_path);
> +
> + return context->period_us;
> +
> +out_close:
> + close(context->period_fd);
> + context->period_fd = -1;
> +out_err:
> + tracefs_put_tracing_file(period_path);
> + return 0;
> +}
> +
> +static int __osnoise_write_runtime(struct osnoise_context *context,
> + unsigned long long runtime)
> +{
> + char buffer[BUFF_U64_STR_SIZE];
> + int retval;
> +
> + if (context->runtime_fd == -1) {
> + err_msg("tried to write osnoise runtime before getting it\n");
> + return 0;
> + }
> +
> + snprintf(buffer, sizeof(buffer), "%llu\n", runtime);
> +
> + retval = write(context->runtime_fd, buffer, strlen(buffer) + 1);
> + if (retval < 0)
> + return -1;
> +
> + context->runtime_us = runtime;
> + return 0;
> +}
> +
> +static int __osnoise_write_period(struct osnoise_context *context,
> + unsigned long long period)
> +{
> + char buffer[BUFF_U64_STR_SIZE];
> + int retval;
> +
> + if (context->period_fd == -1)
> + return 0;
> +
> + snprintf(buffer, sizeof(buffer), "%llu\n", period);
> +
> + retval = write(context->period_fd, buffer, strlen(buffer) + 1);
> + if (retval < 0)
> + return -1;
> +
> + context->period_us = period;
> + return 0;
> +}
> +
> +/*
> + * osnoise_set_runtime_period - set osnoise runtime and period
> + *
> + * Osnoise's runtime and period are related as runtime <= period.
> + * Thus, this function saves the original values, and then tries
> + * to set the runtime and period if they are != 0.
> + */
> +int osnoise_set_runtime_period(struct osnoise_context *context,
> + unsigned long long runtime,
> + unsigned long long period)
> +{
> + unsigned long long curr_runtime_us;
> + unsigned long long curr_period_us;
> + int retval;
> +
> + if (!period && !runtime)
> + return 0;
> +
> + curr_runtime_us = osnoise_get_runtime(context);
> + curr_period_us = osnoise_get_period(context);
> +
> + if (!curr_period_us || !curr_runtime_us)
> + return -1;
> +
> + if (!period) {
> + if (runtime > curr_period_us)
> + return -1;
> + return __osnoise_write_runtime(context, runtime);
> + } else if (!runtime) {
> + if (period < curr_runtime_us)
> + return -1;
> + return __osnoise_write_period(context, period);
> + }
> +
> + if (runtime > curr_period_us) {
> + retval = __osnoise_write_period(context, period);
> + if (retval)
> + return -1;
> + retval = __osnoise_write_runtime(context, runtime);
> + if (retval)
> + return -1;
> + } else {
> + retval = __osnoise_write_runtime(context, runtime);
> + if (retval)
> + return -1;
> + retval = __osnoise_write_period(context, period);
> + if (retval)
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * osnoise_restore_runtime_period - restore the original runtime and period
> + */
> +void osnoise_restore_runtime_period(struct osnoise_context *context)
> +{
> + unsigned long long runtime = context->orig_runtime_us;
> + unsigned long long period = context->orig_period_us;
> + int retval;
> +
> + if (context->runtime_fd < 0 && context->period_fd < 0)
> + return;
> +
> + retval = osnoise_set_runtime_period(context, runtime, period);
> + if (retval)
> + err_msg("Could not restore original osnoise runtime/period\n");
> +}
> +
> +/*
> + * osnoise_get_stop_us - read and save the original "stop_tracing_us"
> + */
> +static long long
> +osnoise_get_stop_us(struct osnoise_context *context)
> +{
> + char buffer[BUFF_U64_STR_SIZE];
> + char *stop_path;
> + int retval;
> +
> + if (context->stop_us_fd > 0)
> + return context->stop_us;
> +
> + stop_path = tracefs_get_tracing_file("osnoise/stop_tracing_us");
> +
> + context->stop_us_fd = open(stop_path, O_RDWR);
> + if (!context->stop_us_fd)
> + goto out_err;
To check "context->stop_us_fd < 0".
> + retval = read(context->stop_us_fd, &buffer, sizeof(buffer));
> + if (!retval)
> + goto out_close;
> +
> + context->stop_us = get_long_from_str(buffer);
> + context->orig_stop_us = context->stop_us;
> +
> + tracefs_put_tracing_file(stop_path);
> +
> + return context->stop_us;
> +
> +out_close:
> + close(context->stop_us_fd);
> + context->stop_us_fd = -1;
> +out_err:
> + tracefs_put_tracing_file(stop_path);
> + return -1;
> +}
> +
> +/*
> + * osnoise_set_stop_us - set "stop_tracing_us"
> + */
> +int osnoise_set_stop_us(struct osnoise_context *context, long long stop_us)
> +{
> + long long curr_stop_us = osnoise_get_stop_us(context);
> + char buffer[BUFF_U64_STR_SIZE];
> + int retval;
> +
> + if (curr_stop_us < 0)
> + return -1;
> +
> + snprintf(buffer, BUFF_U64_STR_SIZE, "%lld\n", stop_us);
> +
> + retval = write(context->stop_us_fd, buffer, strlen(buffer) + 1);
> + if (retval < 0)
> + return -1;
> +
> + context->stop_us = stop_us;
> +
> + return 0;
> +}
> +
> +/*
> + * osnoise_restore_stop_us - restore the original stop_tracing_us
> + */
> +void osnoise_restore_stop_us(struct osnoise_context *context)
> +{
> + char buffer[BUFF_U64_STR_SIZE];
> + int retval;
> +
> + if (context->stop_us_fd < 0)
> + return;
> +
> + if (context->orig_stop_us == context->stop_us)
> + return;
> +
> + snprintf(buffer, BUFF_U64_STR_SIZE, "%lld\n", context->orig_stop_us);
> +
> + retval = write(context->stop_us_fd, buffer, strlen(buffer) + 1);
> + if (retval < 0)
> + err_msg("Could not restore original osnoise stop_us\n");
> +}
> +
> +/*
> + * osnoise_get_stop_us - read and save the original "stop_tracing_total_us"
osnoise_get_stop_total_us is this function name. Use it in comment.
> + */
> +static long long
> +osnoise_get_stop_total_us(struct osnoise_context *context)
> +{
> + char buffer[BUFF_U64_STR_SIZE];
> + char *stop_path;
> + int retval;
> +
> + if (context->stop_total_us_fd > 0)
> + return context->stop_total_us;
> +
> + stop_path = tracefs_get_tracing_file("osnoise/stop_tracing_total_us");
> +
> + context->stop_total_us_fd = open(stop_path, O_RDWR);
> + if (!context->stop_total_us_fd)
> + goto out_err;
Should check "context->stop_total_us_fd < 0".
All these fd check is checking it is not zero. But if error happens,
it should return -1. Or am I wrong.
> + retval = read(context->stop_total_us_fd, &buffer, sizeof(buffer));
> + if (!retval)
> + goto out_close;
> +
> + context->stop_total_us = get_long_from_str(buffer);
> + context->orig_stop_total_us = context->stop_total_us;
> +
> + tracefs_put_tracing_file(stop_path);
> +
> + return context->stop_total_us;
> +
> +out_close:
> + close(context->stop_total_us_fd);
> + context->stop_total_us_fd = -1;
> +out_err:
> + tracefs_put_tracing_file(stop_path);
> + return -1;
> +}
> +
> +/*
> + * osnoise_set_stop_us - set "stop_tracing_total_us"
Use function name osnoise_set_stop_total_us instead.
> + */
> +int osnoise_set_stop_total_us(struct osnoise_context *context, long long stop_total_us)
> +{
> + long long curr_stop_total_us = osnoise_get_stop_total_us(context);
> + char buffer[BUFF_U64_STR_SIZE];
> + int retval;
> +
> + if (curr_stop_total_us < 0)
> + return -1;
> +
> + snprintf(buffer, BUFF_U64_STR_SIZE, "%lld\n", stop_total_us);
> +
> + retval = write(context->stop_total_us_fd, buffer, strlen(buffer) + 1);
> + if (retval < 0)
> + return -1;
> +
> + context->stop_total_us = stop_total_us;
> +
> + return 0;
> +}
> +
> +/*
> + * osnoise_restore_stop_us - restore the original stop_tracing_us
The function name is osnoise_restore_stop_total_us, use it in the comment.
> + */
> +void osnoise_restore_stop_total_us(struct osnoise_context *context)
> +{
> + char buffer[BUFF_U64_STR_SIZE];
> + int retval;
> +
> + if (context->stop_total_us_fd < 0)
> + return;
> +
> + if (context->orig_stop_total_us == context->stop_total_us)
> + return;
> +
> + snprintf(buffer, BUFF_U64_STR_SIZE, "%lld\n", context->orig_stop_total_us);
> +
> + retval = write(context->stop_total_us_fd, buffer, strlen(buffer) + 1);
> + if (retval < 0)
> + err_msg("Could not restore original osnoise stop_total_us\n");
> +}
> +
> +/*
> + * osnoise_get_timerlat_period_us - read and save the original "timerlat_period_us"
> + */
> +static long long
> +osnoise_get_timerlat_period_us(struct osnoise_context *context)
> +{
> + char buffer[BUFF_U64_STR_SIZE];
> + char *stop_path;
> + int retval;
> +
> + if (context->timerlat_period_us_fd > 0)
> + return context->timerlat_period_us;
> +
> + stop_path = tracefs_get_tracing_file("osnoise/timerlat_period_us");
> +
> + context->timerlat_period_us_fd = open(stop_path, O_RDWR);
> + if (!context->timerlat_period_us_fd)
> + goto out_err;
Same as above. To check "context->timerlat_period_us_fd < 0".
> + retval = read(context->timerlat_period_us_fd, &buffer, sizeof(buffer));
> + if (!retval)
> + goto out_close;
> +
> + context->timerlat_period_us = get_long_from_str(buffer);
> + context->orig_timerlat_period_us = context->timerlat_period_us;
> +
> + tracefs_put_tracing_file(stop_path);
> +
> + return context->timerlat_period_us;
> +
> +out_close:
> + close(context->timerlat_period_us_fd);
> + context->timerlat_period_us_fd = -1;
> +out_err:
> + tracefs_put_tracing_file(stop_path);
> + return -1;
> +}
> +
> +/*
> + * osnoise_set_timerlat_period_us - set "timerlat_period_us"
> + */
> +int osnoise_set_timerlat_period_us(struct osnoise_context *context, long long timerlat_period_us)
> +{
> + long long curr_timerlat_period_us = osnoise_get_timerlat_period_us(context);
> + char buffer[BUFF_U64_STR_SIZE];
> + int retval;
> +
> + if (curr_timerlat_period_us < 0)
> + return -1;
> +
> + snprintf(buffer, BUFF_U64_STR_SIZE, "%lld\n", timerlat_period_us);
> +
> + retval = write(context->timerlat_period_us_fd, buffer, strlen(buffer) + 1);
> + if (retval < 0)
> + return -1;
> +
> + context->timerlat_period_us = timerlat_period_us;
> +
> + return 0;
> +}
> +
> +/*
> + * osnoise_restore_timerlat_period_us - restore "timerlat_period_us"
> + */
> +void osnoise_restore_timerlat_period_us(struct osnoise_context *context)
> +{
> + char buffer[BUFF_U64_STR_SIZE];
> + int retval;
> +
> + if (context->timerlat_period_us_fd < 0)
> + return;
> +
> + if (context->orig_timerlat_period_us == context->timerlat_period_us)
> + return;
> +
> + snprintf(buffer, BUFF_U64_STR_SIZE, "%lld\n", context->orig_timerlat_period_us);
> +
> + retval = write(context->timerlat_period_us_fd, buffer, strlen(buffer) + 1);
> + if (retval < 0)
> + err_msg("Could not restore original osnoise timerlat_period_us\n");
> +}
> +
> +/*
> + * osnoise_get_print_stack - read and save the original "print_stack"
> + */
> +static long long
> +osnoise_get_print_stack(struct osnoise_context *context)
> +{
> + char buffer[BUFF_U64_STR_SIZE];
> + char *stop_path;
> + int retval;
> +
> + if (context->print_stack_fd > 0)
> + return context->print_stack;
> +
> + stop_path = tracefs_get_tracing_file("osnoise/print_stack");
> +
> + context->print_stack_fd = open(stop_path, O_RDWR);
> + if (!context->print_stack_fd)
> + goto out_err;
Same as above, to check "context->print_stack_fd < 0".
> + retval = read(context->print_stack_fd, &buffer, sizeof(buffer));
> + if (!retval)
> + goto out_close;
> +
> + context->print_stack = get_long_from_str(buffer);
> + context->orig_print_stack = context->print_stack;
> +
> + tracefs_put_tracing_file(stop_path);
> +
> + return context->print_stack;
> +
> +out_close:
> + close(context->print_stack_fd);
> + context->print_stack_fd = -1;
> +out_err:
> + tracefs_put_tracing_file(stop_path);
> + return -1;
> +}
> +
> +/*
> + * osnoise_set_print_stack - set "print_stack"
> + */
> +int osnoise_set_print_stack(struct osnoise_context *context, long long print_stack)
> +{
> + long long curr_print_stack = osnoise_get_print_stack(context);
> + char buffer[BUFF_U64_STR_SIZE];
> + int retval;
> +
> + if (curr_print_stack < 0)
> + return -1;
> +
> + snprintf(buffer, BUFF_U64_STR_SIZE, "%lld\n", print_stack);
> +
> + retval = write(context->print_stack_fd, buffer, strlen(buffer) + 1);
> + if (retval < 0)
> + return -1;
Do all the osnoise_set_* function need to check "context->*_fd >= 0" ?
Thanks,
Tao
