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Date: Thu, 27 Jan 2022 10:00:53 +0900
From: Byungchul Park <byungchul.park@....com>
To: torvalds@...ux-foundation.org, mingo@...hat.com,
linux-kernel@...r.kernel.org
Cc: peterz@...radead.org, will@...nel.org, tglx@...utronix.de,
rostedt@...dmis.org, joel@...lfernandes.org, sashal@...nel.org,
daniel.vetter@...ll.ch, chris@...is-wilson.co.uk,
duyuyang@...il.com, johannes.berg@...el.com, tj@...nel.org,
tytso@....edu, willy@...radead.org, david@...morbit.com,
amir73il@...il.com, bfields@...ldses.org,
gregkh@...uxfoundation.org, kernel-team@....com,
linux-mm@...ck.org, akpm@...ux-foundation.org, mhocko@...nel.org,
minchan@...nel.org, hannes@...xchg.org, vdavydov.dev@...il.com,
sj@...nel.org, jglisse@...hat.com, dennis@...nel.org, cl@...ux.com,
penberg@...nel.org, rientjes@...gle.com, vbabka@...e.cz,
ngupta@...are.org, linux-block@...r.kernel.org, axboe@...nel.dk,
paolo.valente@...aro.org, josef@...icpanda.com,
linux-fsdevel@...r.kernel.org, viro@...iv.linux.org.uk,
jack@...e.cz, jlayton@...nel.org, dan.j.williams@...el.com,
hch@...radead.org, djwong@...nel.org,
dri-devel@...ts.freedesktop.org, airlied@...ux.ie,
rodrigosiqueiramelo@...il.com, melissa.srw@...il.com,
hamohammed.sa@...il.com
Subject: Re: [RFC 00/14] DEPT(DEPendency Tracker)
+cc
linux-mm@...ck.org
akpm@...ux-foundation.org
mhocko@...nel.org
minchan@...nel.org
hannes@...xchg.org
vdavydov.dev@...il.com
sj@...nel.org
jglisse@...hat.com
dennis@...nel.org
cl@...ux.com
penberg@...nel.org
rientjes@...gle.com
vbabka@...e.cz
ngupta@...are.org
linux-block@...r.kernel.org
axboe@...nel.dk
paolo.valente@...aro.org
josef@...icpanda.com
linux-fsdevel@...r.kernel.org
viro@...iv.linux.org.uk
jack@...e.cz
jlayton@...nel.org
dan.j.williams@...el.com
hch@...radead.org
djwong@...nel.org
dri-devel@...ts.freedesktop.org
airlied@...ux.ie
rodrigosiqueiramelo@...il.com
melissa.srw@...il.com
hamohammed.sa@...il.com
--->8---
>From 68ee7ab996fc7d67b6b506f48da106493ca2546a Mon Sep 17 00:00:00 2001
From: Byungchul Park <byungchul.park@....com>
Date: Tue, 25 Jan 2022 10:12:54 +0900
Subject: [RFC 00/14] DEPT(DEPendency Tracker)
Hi forks,
I've been developing a tool for detecting deadlock possibilities by
tracking wait/event rather than lock(?) acquisition order to try to
cover all synchonization machanisms. It's done on v5.10 tag. I bet
it would work great! Try it and see what's gonna happen.
Now that there's a porting issue, I made Dept rely on Lockdep. But it
should be separated from Lockdep once it's considered worth having.
Benifit:
0. Works with all lock primitives.
1. Works with wait_for_completion()/complete().
2. Works with 'wait' on PG_locked.
3. Works with 'wait' on PG_writeback.
4. Works with swait/wakeup.
5. Multiple reports are allowed.
6. Deduplication control on multiple reports.
7. Withstand false positives thanks to 5.
8. Easy to tag any wait/event.
Future work:
0. To make it more stable.
1. To separates Dept from Lockdep.
2. To improves performance in terms of time and space.
3. To use Dept as a dependency engine for Lockdep.
4. To add any missing tags of wait/event in the kernel.
5. To deduplicate stack trace.
I hope you guys are gonna be satisfied with Dept. Don't hesitate to
give any feedback. I will adopt any feedbacks if reasonable.
Thanks,
Byungchul
Byungchul Park (14):
llist: Move llist_{head,node} definition to types.h
dept: Implement Dept(Dependency Tracker)
dept: Embed Dept data in Lockdep
dept: Apply Dept to spinlock
dept: Apply Dept to mutex families
dept: Apply Dept to rwlock
dept: Apply Dept to wait_for_completion()/complete()
dept: Apply Dept to seqlock
dept: Apply Dept to rwsem
dept: Add proc knobs to show stats and dependency graph
dept: Introduce split map concept and new APIs for them
dept: Apply Dept to wait/event of PG_{locked,writeback}
dept: Separate out SDT(Single-event Dependency Tracker) header
dept: Apply SDT to swait
include/linux/completion.h | 48 +-
include/linux/dept.h | 541 ++++++++
include/linux/dept_page.h | 71 +
include/linux/dept_sdt.h | 53 +
include/linux/hardirq.h | 3 +
include/linux/irqflags.h | 33 +-
include/linux/llist.h | 9 +-
include/linux/lockdep.h | 156 ++-
include/linux/lockdep_types.h | 3 +
include/linux/mutex.h | 31 +
include/linux/page-flags.h | 26 +-
include/linux/pagemap.h | 7 +-
include/linux/percpu-rwsem.h | 10 +-
include/linux/rtmutex.h | 11 +-
include/linux/rwlock.h | 48 +
include/linux/rwlock_api_smp.h | 8 +-
include/linux/rwlock_types.h | 7 +
include/linux/rwsem.h | 31 +
include/linux/sched.h | 3 +
include/linux/seqlock.h | 19 +-
include/linux/spinlock.h | 24 +
include/linux/spinlock_types.h | 10 +
include/linux/swait.h | 4 +
include/linux/types.h | 8 +
init/init_task.c | 2 +
init/main.c | 4 +
kernel/Makefile | 1 +
kernel/dependency/Makefile | 5 +
kernel/dependency/dept.c | 2593 +++++++++++++++++++++++++++++++++++++
kernel/dependency/dept_hash.h | 11 +
kernel/dependency/dept_internal.h | 26 +
kernel/dependency/dept_object.h | 14 +
kernel/dependency/dept_proc.c | 97 ++
kernel/exit.c | 1 +
kernel/fork.c | 2 +
kernel/locking/lockdep.c | 12 +-
kernel/module.c | 2 +
kernel/sched/completion.c | 12 +-
kernel/sched/swait.c | 8 +
kernel/softirq.c | 6 +-
kernel/trace/trace_preemptirq.c | 19 +-
lib/Kconfig.debug | 21 +
mm/filemap.c | 62 +
mm/page_ext.c | 5 +
44 files changed, 4009 insertions(+), 58 deletions(-)
create mode 100644 include/linux/dept.h
create mode 100644 include/linux/dept_page.h
create mode 100644 include/linux/dept_sdt.h
create mode 100644 kernel/dependency/Makefile
create mode 100644 kernel/dependency/dept.c
create mode 100644 kernel/dependency/dept_hash.h
create mode 100644 kernel/dependency/dept_internal.h
create mode 100644 kernel/dependency/dept_object.h
create mode 100644 kernel/dependency/dept_proc.c
--
1.9.1
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