From patchwork Wed May 8 09:47:03 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Byungchul Park X-Patchwork-Id: 13658416 Received: from invmail4.hynix.com (exvmail4.hynix.com [166.125.252.92]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4F1527E0F2; Wed, 8 May 2024 10:02:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=166.125.252.92 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715162585; cv=none; b=kbg0LjMj4sBEq0AKiHHKbqKN3Y96DUErXSkJG5YOH49kjBDoPxnF3MP9gnNI3AEBhLpB7Rif30rWBEvBZaPuk1XZgAzfhP1ZslA1ry8hphB2+g+hxnStGzYurCSVx8+tZvrrj4v/SmHfLdTyvok/RHIO0+ighcR5v03lNq1P/lc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715162585; c=relaxed/simple; bh=37cSYW8WA/TnfUxZD66nhjfMFS+Rdxdh6OVt7EPfSog=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=nH1tQt1EaVBNEQ1xPP2N1PnUGdtNI6eRqQt1oL1gumn5ay2PcK74zntMuh6BT4qaxA4O+4CLcZe84j41vQIL+39DKNMYHTsWQXok5RuJZrTLb4J967BVI5TV7FwO1dGA4naVUgSYKxCDySohTUeMqV0IweixU2rHq2TvwCRSTRw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sk.com; spf=pass smtp.mailfrom=sk.com; arc=none smtp.client-ip=166.125.252.92 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sk.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sk.com X-AuditID: a67dfc5b-d85ff70000001748-75-663b4a39b220 From: Byungchul Park To: linux-kernel@vger.kernel.org Cc: kernel_team@skhynix.com, torvalds@linux-foundation.org, damien.lemoal@opensource.wdc.com, linux-ide@vger.kernel.org, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, will@kernel.org, tglx@linutronix.de, rostedt@goodmis.org, joel@joelfernandes.org, sashal@kernel.org, daniel.vetter@ffwll.ch, duyuyang@gmail.com, johannes.berg@intel.com, tj@kernel.org, tytso@mit.edu, willy@infradead.org, david@fromorbit.com, amir73il@gmail.com, 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, josef@toxicpanda.com, linux-fsdevel@vger.kernel.org, jack@suse.cz, jlayton@kernel.org, dan.j.williams@intel.com, hch@infradead.org, djwong@kernel.org, dri-devel@lists.freedesktop.org, rodrigosiqueiramelo@gmail.com, melissa.srw@gmail.com, hamohammed.sa@gmail.com, 42.hyeyoo@gmail.com, chris.p.wilson@intel.com, gwan-gyeong.mun@intel.com, max.byungchul.park@gmail.com, boqun.feng@gmail.com, longman@redhat.com, hdanton@sina.com, her0gyugyu@gmail.com Subject: [PATCH v14 06/28] dept: Add proc knobs to show stats and dependency graph Date: Wed, 8 May 2024 18:47:03 +0900 Message-Id: <20240508094726.35754-7-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240508094726.35754-1-byungchul@sk.com> References: <20240508094726.35754-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzXSa0xTZxgHcN73nPOeQ0PJsRg54octZY0J3kARH5wxfNITll0ylxhv0UYO 0sjFFEHrMgWpCCgOXJAN2FYKVlLwVjBeaLWWgCKhltEwlItAiI5R6IIWrZBhq+HLk1/y/J// p4ejFC1MFKfJPCppM9XpSiKjZVNhtWsSk79MjS3+Vwnl52PB96aIhprrTQRc1xoRNLXkY5ho 3w5/z3oQzHU/paCywoWgdnSIgpaOYQS2htMEesfDwe3zEuisOEegoO46gZ7JeQyDly5iaLR8 DV1lRgx2/ysaKicIVFcW4MD4B4PfZGbBlKeCsYYqFuZH46BzuI8B2/NV8NsfgwSstk4aOu6M Yei9V0NguGmBga6OxzS4yksZuDptJDA5a6LA5POy8JfdgOGGPlBU+Pp/Bh6V2jEU1t/E4H7W iuB+0QgGS1MfgTafB0OzpYKC91faEYxdmGLhzHk/C9X5FxCcO3OJBv3gRph7V0OSEsU2j5cS 9c3HRNusgRafGAXxbtUQK+rvP2dFgyVHbG6IEeusE1isnfExosVcTETLzEVWLJlyY3Ha6WTF x7/O0eK4uxJ/F7VbtiVFStfkStp1Ww/I0vwDPx55knC87JaD5KHG1SUolBP4eOGX+kK8aOvU GBs04VcK/f1+Kuil/OdCc+lLJmiK98iEeue2oCP474W6NvfHPM2rhBejDhK0nN8oFD/9k3zq /ExovGH/2BPKJwjPXk2joBWBTGtBVeBWFsgscIL1bQvz6WC58LChny5DcgMKMSOFJjM3Q61J j1+bpsvUHF97MCvDggK/ZPppfs8dNOPa4UA8h5Rhcnvk5lQFo87N1mU4kMBRyqXy9rObUhXy FLXuhKTN2q/NSZeyHWgFRysj5etnj6Uo+EPqo9JhSToiaRe3mAuNykO6H8xUX45x28hJg77K 1p2YfHnD7wOt+5nqEfuBvBLNkgjN1giQ5hJ2qHb9h5OGQNV18oFVlfoy2pxMxXlu9+T3O791 FTlNu8K/8oYY0+gkv6BZ1iZf4LxhRLf3C09xb+S+dQMTrrOxTofimxgcnTz58ylF0kzhzuj8 R9zecSWdnaaOi6G02eoPVffRMUcDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAAzXSe0hTYRgG8L7vnPOduZqcltGpoGLQBSvLSnvLiC6Qh6ILUQRB5KijDqfZ piuLwNq66kwjXekqL7VEV9YssHIxtmbaxSxHZelSM8u8RTlpaRdX9M/LD56H569XQsnzmEkS VVKKqElSqhVESks3ROnnLlkbFTu/4+1oyMmcD76BEzSYK6wEGq6XI7DeOoyhyx0NrwZ7EAw9 fUaBKbcBQVFbCwW3arwI7KVHCDR2BIPH10+gLjeDgL6kgsDz7mEMzXlnMJTb1sPj7GIMDv9H GkxdBApMejxyPmHwW8pYsKRPh/bSfBaG28KhzvuSAdeFOgbsb2bD+YvNBKrtdTTUVLVjaLxr JuC1/mbgcU0tDQ05Rgau9RUT6B60UGDx9bPwwlGI4YZhZO3Yt18MPDQ6MBy7fBODp+kegvsn WjHYrC8JuHw9GCptuRT8uOpG0J7Vy8LRTD8LBYezEGQczaPB0BwBQ9/NZMVSwdXTTwmGyn2C fbCQFh4V88Kd/BZWMNx/wwqFtlShsjRUKKnuwkLRVx8j2MpOEsH29QwrnOr1YKGvvp4Vas8N 0UKHx4Q3Td4uXbZbVKt0ombe8hhpvP/tweRHkfuzbztJOiqfcwoFSXhuEV/d284GTLiZ/OvX firgEG4aX2nsZAKmuB4pf7l+TcDjuM18icvzt09z0/l3bU4SsIyL4E8+u0T+bU7ly284/u4E cZF808c+FLB8pHNPn89mI2khGlWGQlRJukSlSh0Rpk2IT0tS7Q/btSfRhka+xXJoOKcKDTRG OxEnQYoxsgYSFStnlDptWqIT8RJKESJzH18cK5ftVqYdEDV7dmpS1aLWiSZLaMUE2dptYoyc i1OmiAmimCxq/qdYEjQpHU2dN2Hi6i/2vTtOB3+mQ1Otxic5cbLg/MHxC97rPYYw9aaMzI6K J+6FxHVzVqQiuTTBWrXQ/GBit/fpla0Hb/98kN6amYpiUjq7xzO9adE4xqLQ6fTjjLVV9Ss7 m36FD7hn8U1ZX1ZsMRd4W1e1xNEte2c4pqwb03V246KxlnWmDwpaG68MD6U0WuUfFEE9rykD AAA= X-CFilter-Loop: Reflected Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 | 95 +++++++++++++++++++++++++++++++ 4 files changed, 131 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 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 7e12e46dc4b7..19406093103e 100644 --- a/kernel/dependency/dept.c +++ b/kernel/dependency/dept.c @@ -74,6 +74,7 @@ #include #include #include +#include "dept_internal.h" static int dept_stop; static int dept_per_cpu_ready; @@ -260,20 +261,13 @@ static bool valid_key(struct dept_key *k) * 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), \ @@ -303,7 +297,7 @@ 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. @@ -338,7 +332,7 @@ 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(); @@ -2092,7 +2086,7 @@ void dept_map_copy(struct dept_map *to, struct dept_map *from) clean_classes_cache(&to->map_key); } -static LIST_HEAD(classes); +LIST_HEAD(dept_classes); static bool within(const void *addr, void *start, unsigned long size) { @@ -2124,7 +2118,7 @@ void dept_free_range(void *start, unsigned int sz) while (unlikely(!dept_lock())) cpu_relax(); - 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; @@ -2200,7 +2194,7 @@ static struct dept_class *check_new_class(struct dept_key *local, c->sub_id = sub_id; c->key = (unsigned long)(k->base + sub_id); hash_add_class(c); - list_add(&c->all_node, &classes); + list_add(&c->all_node, &dept_classes); unlock: dept_unlock(); caching: @@ -2915,8 +2909,8 @@ 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 000000000000..007c1eec6bab --- /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 000000000000..7d61dfbc5865 --- /dev/null +++ b/kernel/dependency/dept_proc.c @@ -0,0 +1,95 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Procfs knobs for Dept(DEPendency Tracker) + * + * Started by Byungchul Park : + * + * Copyright (C) 2021 LG Electronics, Inc. , Byungchul Park + */ +#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; + const char *prefix; + + if (v == &dept_classes) { + seq_puts(m, "All classes:\n\n"); + return 0; + } + + prefix = fc->sched_map ? " " : ""; + 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 ? " " : ""; + 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);