On Wed, 17 May 2006 20:56:20 +0200 Martin Peschke wrote:
> This patch adds statistics infrastructure as common code.
>
> Signed-off-by: Martin Peschke <[email protected]>
> ---
>
> MAINTAINERS | 7
> arch/s390/Kconfig | 6
> arch/s390/oprofile/Kconfig | 5
> include/linux/statistic.h | 296 +++++++++
> lib/Kconfig.statistic | 11
> lib/Makefile | 2
> lib/statistic.c | 1454 +++++++++++++++++++++++++++++++++++++++++++++
> 7 files changed, 1776 insertions(+), 5 deletions(-)
>
> diff -Nurp a/include/linux/statistic.h b/include/linux/statistic.h
> --- a/include/linux/statistic.h 1970-01-01 01:00:00.000000000 +0100
> +++ b/include/linux/statistic.h 2006-05-17 19:11:32.000000000 +0200
> @@ -0,0 +1,296 @@
> +/*
> + * include/linux/statistic.h
> + *
> + * Statistics facility
> + *
If some of the following struct fields are private and some are
public, you can use kernel-doc tags:
/* private: */
and
/* public: */
to delineate them. See Doc/kernel-doc-nano-HOWTO.txt for more info.
> +struct statistic_interface {
> + /* private */
> + struct list_head list;
> + struct dentry *debugfs_dir;
> + struct dentry *data_file;
> + struct dentry *def_file;
> + /* these have to be set by exploiter prior calling statistic_create() */
> + struct statistic *stat; /* mandatory */
> + struct statistic_info *info; /* mandatory */
> + int number; /* mandatory */
> + int (*pull)(void*); /* optional */
> + void *pull_private; /* optional */
> +};
> diff -Nurp a/lib/statistic.c b/lib/statistic.c
> --- a/lib/statistic.c 1970-01-01 01:00:00.000000000 +0100
> +++ b/lib/statistic.c 2006-05-17 19:11:32.000000000 +0200
> @@ -0,0 +1,1454 @@
> +/*
> + * lib/statistic.c
> + * statistics facility
> + *
> +
> +static void statistic_parse_line(struct statistic_interface *interface,
> + char *def)
> +{
> + char *p, *copy, *twisted, *name = NULL;
> + substring_t args[MAX_OPT_ARGS];
> + int token, reset = 0, defaults = 0, i;
> + int state = STATISTIC_STATE_INVALID;
> + struct statistic *stat = interface->stat;
> + struct statistic_info *info = interface->info;
> +
> + if (unlikely(!def))
> + return;
> + twisted = copy = kstrdup(def, GFP_KERNEL);
> + if (unlikely(!copy))
> + return;
> +
> + while ((p = strsep(&twisted, " ")) != NULL) {
> + if (!*p)
> + continue;
> + token = match_token(p, statistic_match_common, args);
> + switch (token) {
> + case STATISTIC_STATE_UNCONFIGURED :
> + case STATISTIC_STATE_RELEASED :
> + case STATISTIC_STATE_OFF :
> + case STATISTIC_STATE_ON :
kernel coding style is no space before ':'.
> + state = token;
> + break;
> + case 1001 :
> + if (likely(!name))
> + name = match_strdup(&args[0]);
> + break;
> + case 1002 :
> + reset = 1;
> + break;
> + case 1003 :
> + defaults = 1;
> + break;
> + }
> + }
> + for (i = 0; i < interface->number; i++, stat++, info++) {
> + if (!name || (name && !strcmp(name, info->name))) {
> + if (defaults)
> + statistic_parse_match(stat, info, NULL);
> + if (name)
> + statistic_parse_match(stat, info, def);
> + if (state != STATISTIC_STATE_INVALID)
> + statistic_transition(stat, info, state);
> + if (reset)
> + statistic_reset(stat, info);
> + }
> + }
> + kfree(copy);
> + kfree(name);
> +}
> +
> +
> +/**
> + * statistic_create - setup statistics and create debugfs files
> + *
No blank line between function name and parameters.
Blank lines after parameters are good.
> + * @interface: struct statistic_interface provided by exploiter
> + * @name: name of debugfs directory to be created
> + *
> + * struct statistic_interface must have been set up prior to calling this.
> + *
> + * Creates a debugfs directory in "statistics" as well as the "data" and
> + * "definition" files. Then we attach setup statistics according to the
> + * definition provided by exploiter through struct statistic_interface.
> + *
> + * On success, 0 is returned.
> + *
> + * If some required memory could not be allocated, or the creation
> + * of debugfs entries failed, this routine fails, and -ENOMEM is returned.
> + */
> +int statistic_create(struct statistic_interface *interface, const char *name)
> +{
> + struct statistic *stat = interface->stat;
> + struct statistic_info *info = interface->info;
> + int i;
> +
> + BUG_ON(!stat || !info || !interface->number);
> +
> + interface->debugfs_dir =
> + debugfs_create_dir(name, statistic_root_dir);
> + if (unlikely(!interface->debugfs_dir))
> + return -ENOMEM;
> +
> + interface->data_file = debugfs_create_file(
> + STATISTIC_FILENAME_DATA, S_IFREG | S_IRUSR,
> + interface->debugfs_dir, (void*)interface, &statistic_data_fops);
> + if (unlikely(!interface->data_file)) {
> + debugfs_remove(interface->debugfs_dir);
> + return -ENOMEM;
> + }
> +
> + interface->def_file = debugfs_create_file(
> + STATISTIC_FILENAME_DEF, S_IFREG | S_IRUSR | S_IWUSR,
> + interface->debugfs_dir, (void*)interface, &statistic_def_fops);
> + if (unlikely(!interface->def_file)) {
> + debugfs_remove(interface->data_file);
> + debugfs_remove(interface->debugfs_dir);
> + return -ENOMEM;
> + }
> +
> + for (i = 0; i < interface->number; i++, stat++, info++) {
> + statistic_transition(stat, info, STATISTIC_STATE_UNCONFIGURED);
> + statistic_parse_match(stat, info, NULL);
> + }
> +
> + mutex_lock(&statistic_list_mutex);
> + list_add(&interface->list, &statistic_list);
> + mutex_unlock(&statistic_list_mutex);
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(statistic_create);
> +
> +
> +static int statistic_parse_histogram(struct statistic *stat,
> + struct statistic_info *info,
> + int type, char *def)
> +{
> + char *p;
> + substring_t args[MAX_OPT_ARGS];
> + int token, got_entries = 0, got_interval = 0, got_range = 0;
> + u32 entries, base_interval;
> + s64 range_min;
> +
> + while ((p = strsep(&def, " ")) != NULL) {
> + if (!*p)
> + continue;
> + token = match_token(p, statistic_match_histogram, args);
> + switch (token) {
> + case 1 :
Lose the space before ':'.
> + match_int(&args[0], &entries);
> + got_entries = 1;
> + break;
> + case 2 :
> + match_int(&args[0], &base_interval);
> + got_interval = 1;
> + break;
> + case 3 :
> + match_s64(&args[0], &range_min, 0);
> + got_range = 1;
> + break;
> + }
> + }
> + if (unlikely(type != stat->type &&
> + !(got_entries && got_interval && got_range)))
> + return -EINVAL;
> + statistic_transition(stat, info, STATISTIC_STATE_UNCONFIGURED);
> + if (got_entries)
> + stat->u.histogram.last_index = entries - 1;
> + if (got_interval)
> + stat->u.histogram.base_interval = base_interval;
> + if (got_range)
> + stat->u.histogram.range_min = range_min;
> + return 0;
> +}
---
~Randy
-
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