lib/ref_tracker: add printing to memory buffer
Similar to stack_(depot|trace)_snprint the patch adds helper to printing stats to memory buffer. It will be helpful in case of debugfs. Signed-off-by: Andrzej Hajda <andrzej.hajda@intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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@ -46,6 +46,8 @@ void ref_tracker_dir_print_locked(struct ref_tracker_dir *dir,
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void ref_tracker_dir_print(struct ref_tracker_dir *dir,
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void ref_tracker_dir_print(struct ref_tracker_dir *dir,
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unsigned int display_limit);
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unsigned int display_limit);
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int ref_tracker_dir_snprint(struct ref_tracker_dir *dir, char *buf, size_t size);
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int ref_tracker_alloc(struct ref_tracker_dir *dir,
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int ref_tracker_alloc(struct ref_tracker_dir *dir,
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struct ref_tracker **trackerp, gfp_t gfp);
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struct ref_tracker **trackerp, gfp_t gfp);
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@ -74,6 +76,12 @@ static inline void ref_tracker_dir_print(struct ref_tracker_dir *dir,
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{
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{
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}
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}
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static inline int ref_tracker_dir_snprint(struct ref_tracker_dir *dir,
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char *buf, size_t size)
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{
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return 0;
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}
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static inline int ref_tracker_alloc(struct ref_tracker_dir *dir,
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static inline int ref_tracker_alloc(struct ref_tracker_dir *dir,
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struct ref_tracker **trackerp,
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struct ref_tracker **trackerp,
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gfp_t gfp)
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gfp_t gfp)
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@ -62,8 +62,27 @@ ref_tracker_get_stats(struct ref_tracker_dir *dir, unsigned int limit)
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return stats;
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return stats;
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}
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}
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void ref_tracker_dir_print_locked(struct ref_tracker_dir *dir,
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struct ostream {
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unsigned int display_limit)
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char *buf;
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int size, used;
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};
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#define pr_ostream(stream, fmt, args...) \
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({ \
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struct ostream *_s = (stream); \
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\
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if (!_s->buf) { \
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pr_err(fmt, ##args); \
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} else { \
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int ret, len = _s->size - _s->used; \
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ret = snprintf(_s->buf + _s->used, len, pr_fmt(fmt), ##args); \
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_s->used += min(ret, len); \
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} \
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})
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static void
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__ref_tracker_dir_pr_ostream(struct ref_tracker_dir *dir,
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unsigned int display_limit, struct ostream *s)
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{
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{
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struct ref_tracker_dir_stats *stats;
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struct ref_tracker_dir_stats *stats;
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unsigned int i = 0, skipped;
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unsigned int i = 0, skipped;
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@ -77,8 +96,8 @@ void ref_tracker_dir_print_locked(struct ref_tracker_dir *dir,
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stats = ref_tracker_get_stats(dir, display_limit);
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stats = ref_tracker_get_stats(dir, display_limit);
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if (IS_ERR(stats)) {
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if (IS_ERR(stats)) {
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pr_err("%s@%pK: couldn't get stats, error %pe\n",
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pr_ostream(s, "%s@%pK: couldn't get stats, error %pe\n",
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dir->name, dir, stats);
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dir->name, dir, stats);
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return;
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return;
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}
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}
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@ -88,19 +107,27 @@ void ref_tracker_dir_print_locked(struct ref_tracker_dir *dir,
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stack = stats->stacks[i].stack_handle;
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stack = stats->stacks[i].stack_handle;
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if (sbuf && !stack_depot_snprint(stack, sbuf, STACK_BUF_SIZE, 4))
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if (sbuf && !stack_depot_snprint(stack, sbuf, STACK_BUF_SIZE, 4))
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sbuf[0] = 0;
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sbuf[0] = 0;
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pr_err("%s@%pK has %d/%d users at\n%s\n", dir->name, dir,
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pr_ostream(s, "%s@%pK has %d/%d users at\n%s\n", dir->name, dir,
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stats->stacks[i].count, stats->total, sbuf);
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stats->stacks[i].count, stats->total, sbuf);
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skipped -= stats->stacks[i].count;
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skipped -= stats->stacks[i].count;
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}
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}
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if (skipped)
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if (skipped)
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pr_err("%s@%pK skipped reports about %d/%d users.\n",
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pr_ostream(s, "%s@%pK skipped reports about %d/%d users.\n",
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dir->name, dir, skipped, stats->total);
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dir->name, dir, skipped, stats->total);
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kfree(sbuf);
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kfree(sbuf);
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kfree(stats);
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kfree(stats);
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}
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}
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void ref_tracker_dir_print_locked(struct ref_tracker_dir *dir,
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unsigned int display_limit)
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{
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struct ostream os = {};
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__ref_tracker_dir_pr_ostream(dir, display_limit, &os);
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}
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EXPORT_SYMBOL(ref_tracker_dir_print_locked);
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EXPORT_SYMBOL(ref_tracker_dir_print_locked);
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void ref_tracker_dir_print(struct ref_tracker_dir *dir,
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void ref_tracker_dir_print(struct ref_tracker_dir *dir,
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@ -114,6 +141,19 @@ void ref_tracker_dir_print(struct ref_tracker_dir *dir,
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}
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}
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EXPORT_SYMBOL(ref_tracker_dir_print);
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EXPORT_SYMBOL(ref_tracker_dir_print);
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int ref_tracker_dir_snprint(struct ref_tracker_dir *dir, char *buf, size_t size)
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{
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struct ostream os = { .buf = buf, .size = size };
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unsigned long flags;
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spin_lock_irqsave(&dir->lock, flags);
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__ref_tracker_dir_pr_ostream(dir, 16, &os);
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spin_unlock_irqrestore(&dir->lock, flags);
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return os.used;
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}
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EXPORT_SYMBOL(ref_tracker_dir_snprint);
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void ref_tracker_dir_exit(struct ref_tracker_dir *dir)
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void ref_tracker_dir_exit(struct ref_tracker_dir *dir)
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{
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{
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struct ref_tracker *tracker, *n;
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struct ref_tracker *tracker, *n;
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