It'd be useful to show dept internal stats and dependency graph on runtime via proc for better information. Introduce the knobs.
Signed-off-by: Byungchul Park byungchul@sk.com --- kernel/dependency/Makefile | 1 + kernel/dependency/dept.c | 11 +--- kernel/dependency/dept_internal.h | 10 ++++ kernel/dependency/dept_proc.c | 96 +++++++++++++++++++++++++++++++ 4 files changed, 109 insertions(+), 9 deletions(-) create mode 100644 kernel/dependency/dept_proc.c
diff --git a/kernel/dependency/Makefile b/kernel/dependency/Makefile index b5cfb8a03c0c..92f165400187 100644 --- a/kernel/dependency/Makefile +++ b/kernel/dependency/Makefile @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_DEPT) += dept.o +obj-$(CONFIG_DEPT) += dept_proc.o diff --git a/kernel/dependency/dept.c b/kernel/dependency/dept.c index 47fef2207af1..fd091ae28ae2 100644 --- a/kernel/dependency/dept.c +++ b/kernel/dependency/dept.c @@ -266,20 +266,13 @@ static bool valid_key(struct dept_key *k) * have been freed will be placed there. */
-enum object_t { -#define OBJECT(id, nr) OBJECT_##id, - #include "dept_object.h" -#undef OBJECT - OBJECT_NR, -}; - #define OBJECT(id, nr) \ static struct dept_##id spool_##id[nr]; \ static DEFINE_PER_CPU(struct llist_head, lpool_##id); #include "dept_object.h" #undef OBJECT
-static struct dept_pool dept_pool[OBJECT_NR] = { +struct dept_pool dept_pool[OBJECT_NR] = { #define OBJECT(id, nr) { \ .name = #id, \ .obj_sz = sizeof(struct dept_##id), \ @@ -2083,7 +2076,7 @@ void dept_map_copy(struct dept_map *to, struct dept_map *from) clean_classes_cache(&to->map_key); }
-static LIST_HEAD(dept_classes); +LIST_HEAD(dept_classes);
static bool within(const void *addr, void *start, unsigned long size) { diff --git a/kernel/dependency/dept_internal.h b/kernel/dependency/dept_internal.h index 04c040dbcbc8..732f297710aa 100644 --- a/kernel/dependency/dept_internal.h +++ b/kernel/dependency/dept_internal.h @@ -279,5 +279,15 @@ struct dept_hash { int bits; };
+enum object_t { +#define OBJECT(id, nr) OBJECT_##id, + #include "dept_object.h" +#undef OBJECT + OBJECT_NR, +}; + +extern struct list_head dept_classes; +extern struct dept_pool dept_pool[]; + #endif #endif /* __DEPT_INTERNAL_H */ diff --git a/kernel/dependency/dept_proc.c b/kernel/dependency/dept_proc.c new file mode 100644 index 000000000000..97beaf397715 --- /dev/null +++ b/kernel/dependency/dept_proc.c @@ -0,0 +1,96 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Procfs knobs for Dept(DEPendency Tracker) + * + * Started by Byungchul Park max.byungchul.park@gmail.com: + * + * Copyright (C) 2021 LG Electronics, Inc. , Byungchul Park + * Copyright (C) 2024 SK hynix, Inc. , Byungchul Park + */ +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/dept.h> +#include "dept_internal.h" + +static void *l_next(struct seq_file *m, void *v, loff_t *pos) +{ + /* + * XXX: Serialize list traversal if needed. The following might + * give a wrong information on contention. + */ + return seq_list_next(v, &dept_classes, pos); +} + +static void *l_start(struct seq_file *m, loff_t *pos) +{ + /* + * XXX: Serialize list traversal if needed. The following might + * give a wrong information on contention. + */ + return seq_list_start_head(&dept_classes, *pos); +} + +static void l_stop(struct seq_file *m, void *v) +{ +} + +static int l_show(struct seq_file *m, void *v) +{ + struct dept_class *fc = list_entry(v, struct dept_class, all_node); + struct dept_dep *d; + const char *prefix; + + if (v == &dept_classes) { + seq_puts(m, "All classes:\n\n"); + return 0; + } + + prefix = fc->sched_map ? "<sched> " : ""; + seq_printf(m, "[%p] %s%s\n", (void *)fc->key, prefix, fc->name); + + /* + * XXX: Serialize list traversal if needed. The following might + * give a wrong information on contention. + */ + list_for_each_entry(d, &fc->dep_head, dep_node) { + struct dept_class *tc = d->wait->class; + + prefix = tc->sched_map ? "<sched> " : ""; + seq_printf(m, " -> [%p] %s%s\n", (void *)tc->key, prefix, tc->name); + } + seq_puts(m, "\n"); + + return 0; +} + +static const struct seq_operations dept_deps_ops = { + .start = l_start, + .next = l_next, + .stop = l_stop, + .show = l_show, +}; + +static int dept_stats_show(struct seq_file *m, void *v) +{ + int r; + + seq_puts(m, "Availability in the static pools:\n\n"); +#define OBJECT(id, nr) \ + r = atomic_read(&dept_pool[OBJECT_##id].obj_nr); \ + if (r < 0) \ + r = 0; \ + seq_printf(m, "%s\t%d/%d(%d%%)\n", #id, r, nr, (r * 100) / (nr)); + #include "dept_object.h" +#undef OBJECT + + return 0; +} + +static int __init dept_proc_init(void) +{ + proc_create_seq("dept_deps", S_IRUSR, NULL, &dept_deps_ops); + proc_create_single("dept_stats", S_IRUSR, NULL, dept_stats_show); + return 0; +} + +__initcall(dept_proc_init);