From patchwork Thu Jan 27 01:11:08 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Byungchul Park X-Patchwork-Id: 12726029 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 34BAFC46467 for ; Thu, 27 Jan 2022 01:11:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234551AbiA0BLb (ORCPT ); Wed, 26 Jan 2022 20:11:31 -0500 Received: from lgeamrelo12.lge.com ([156.147.23.52]:38129 "EHLO lgeamrelo11.lge.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S234401AbiA0BLX (ORCPT ); Wed, 26 Jan 2022 20:11:23 -0500 Received: from unknown (HELO lgemrelse6q.lge.com) (156.147.1.121) by 156.147.23.52 with ESMTP; 27 Jan 2022 10:11:19 +0900 X-Original-SENDERIP: 156.147.1.121 X-Original-MAILFROM: byungchul.park@lge.com Received: from unknown (HELO localhost.localdomain) (10.177.244.38) by 156.147.1.121 with ESMTP; 27 Jan 2022 10:11:19 +0900 X-Original-SENDERIP: 10.177.244.38 X-Original-MAILFROM: byungchul.park@lge.com From: Byungchul Park To: torvalds@linux-foundation.org, mingo@redhat.com, linux-kernel@vger.kernel.org Cc: peterz@infradead.org, will@kernel.org, tglx@linutronix.de, rostedt@goodmis.org, joel@joelfernandes.org, sashal@kernel.org, daniel.vetter@ffwll.ch, chris@chris-wilson.co.uk, duyuyang@gmail.com, johannes.berg@intel.com, tj@kernel.org, tytso@mit.edu, willy@infradead.org, david@fromorbit.com, amir73il@gmail.com, bfields@fieldses.org, gregkh@linuxfoundation.org, kernel-team@lge.com, linux-mm@kvack.org, akpm@linux-foundation.org, mhocko@kernel.org, minchan@kernel.org, hannes@cmpxchg.org, vdavydov.dev@gmail.com, sj@kernel.org, jglisse@redhat.com, dennis@kernel.org, cl@linux.com, penberg@kernel.org, rientjes@google.com, vbabka@suse.cz, ngupta@vflare.org, linux-block@vger.kernel.org, axboe@kernel.dk, paolo.valente@linaro.org, josef@toxicpanda.com, linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk, jack@suse.cz, jlayton@kernel.org, dan.j.williams@intel.com, hch@infradead.org, djwong@kernel.org, dri-devel@lists.freedesktop.org, airlied@linux.ie, rodrigosiqueiramelo@gmail.com, melissa.srw@gmail.com, hamohammed.sa@gmail.com Subject: [PATCH on v5.17-rc1 10/14] dept: Add proc knobs to show stats and dependency graph Date: Thu, 27 Jan 2022 10:11:08 +0900 Message-Id: <1643245873-15542-10-git-send-email-byungchul.park@lge.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1643245873-15542-1-git-send-email-byungchul.park@lge.com> References: <1643245733-14513-1-git-send-email-byungchul.park@lge.com> <1643245873-15542-1-git-send-email-byungchul.park@lge.com> Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org It'd be useful to show Dept internal stats and dependency graph on runtime via proc for better information. Introduced the knobs. Signed-off-by: Byungchul Park --- kernel/dependency/Makefile | 1 + kernel/dependency/dept.c | 24 ++++------ kernel/dependency/dept_internal.h | 26 +++++++++++ kernel/dependency/dept_proc.c | 97 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 133 insertions(+), 15 deletions(-) create mode 100644 kernel/dependency/dept_internal.h create mode 100644 kernel/dependency/dept_proc.c diff --git a/kernel/dependency/Makefile b/kernel/dependency/Makefile index 9f7778e..49152ad 100644 --- a/kernel/dependency/Makefile +++ b/kernel/dependency/Makefile @@ -1,4 +1,5 @@ # 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 64287894..b682bf9 100644 --- a/kernel/dependency/dept.c +++ b/kernel/dependency/dept.c @@ -90,6 +90,7 @@ #include #include #include +#include "dept_internal.h" static int dept_stop; static int dept_per_cpu_ready; @@ -241,20 +242,13 @@ static inline struct dept_task *dept_task(void) * have been freed will be placed. */ -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 pool[OBJECT_NR] = { +struct dept_pool dept_pool[OBJECT_NR] = { #define OBJECT(id, nr) { \ .name = #id, \ .obj_sz = sizeof(struct dept_##id), \ @@ -283,7 +277,7 @@ static void *from_pool(enum object_t t) if (DEPT_WARN_ON(!irqs_disabled())) return NULL; - p = &pool[t]; + p = &dept_pool[t]; /* * Try local pool first. @@ -312,7 +306,7 @@ static void *from_pool(enum object_t t) static void to_pool(void *o, enum object_t t) { - struct dept_pool *p = &pool[t]; + struct dept_pool *p = &dept_pool[t]; struct llist_head *h; preempt_disable(); @@ -1986,7 +1980,7 @@ void dept_map_nocheck(struct dept_map *m) } EXPORT_SYMBOL_GPL(dept_map_nocheck); -static LIST_HEAD(classes); +LIST_HEAD(dept_classes); static inline bool within(const void *addr, void *start, unsigned long size) { @@ -2031,7 +2025,7 @@ void dept_free_range(void *start, unsigned int sz) */ free_staleie_staleiw_range(start, sz); - list_for_each_entry_safe(c, n, &classes, all_node) { + list_for_each_entry_safe(c, n, &dept_classes, all_node) { if (!within((void *)c->key, start, sz) && !within(c->name, start, sz)) continue; @@ -2100,7 +2094,7 @@ static struct dept_class *check_new_class(struct dept_key *local, c->sub = sub; c->key = (unsigned long)(k->subkeys + sub); hash_add_class(c); - list_add(&c->all_node, &classes); + list_add(&c->all_node, &dept_classes); unlock: dept_unlock(); caching: @@ -2429,8 +2423,8 @@ static void migrate_per_cpu_pool(void) struct llist_head *from; struct llist_head *to; - from = &pool[i].boot_pool; - to = per_cpu_ptr(pool[i].lpool, boot_cpu); + from = &dept_pool[i].boot_pool; + to = per_cpu_ptr(dept_pool[i].lpool, boot_cpu); move_llist(to, from); } } diff --git a/kernel/dependency/dept_internal.h b/kernel/dependency/dept_internal.h new file mode 100644 index 0000000..007c1ee --- /dev/null +++ b/kernel/dependency/dept_internal.h @@ -0,0 +1,26 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Dept(DEPendency Tracker) - runtime dependency tracker internal header + * + * Started by Byungchul Park : + * + * Copyright (c) 2020 LG Electronics, Inc., Byungchul Park + */ + +#ifndef __DEPT_INTERNAL_H +#define __DEPT_INTERNAL_H + +#ifdef CONFIG_DEPT + +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 0000000..5e5afa3 --- /dev/null +++ b/kernel/dependency/dept_proc.c @@ -0,0 +1,97 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * kernel/dependency/dept_proc.c + * + * Runtime dependency tracker + * + * Started by Byungchul Park : + * + * Copyright (C) 2021 LG Electronics, Inc. , Byungchul Park + * + * Code for /proc/dept_*: + * + */ +#include +#include +#include +#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; + + if (v == &dept_classes) { + seq_printf(m, "All classes:\n\n"); + return 0; + } + + seq_printf(m, "[%p] %s\n", (void *)fc->key, 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; + seq_printf(m, " -> [%p] %s\n", (void *)tc->key, 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_printf(m, "Availablity 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); +