From: Peter Zijlstra <peterz@infradead.org>
To: Qian Cai <cai@lca.pw>
Cc: Waiman Long <longman@redhat.com>, Ingo Molnar <mingo@redhat.com>,
Will Deacon <will.deacon@arm.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] locking/lockdep: Increase MAX_LOCKDEP_ENTRIES by half
Date: Tue, 26 May 2020 21:56:30 +0200 [thread overview]
Message-ID: <20200526195630.GF325280@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20200526185850.GE991@lca.pw>
On Tue, May 26, 2020 at 02:58:50PM -0400, Qian Cai wrote:
> I still don't understand why reading all sysfs files on this system
> could increase that much, but here is the lockdep file after
> running sysfs read to see if you could spot anything obviously,
>
> https://cailca.github.io/files/lockdep.txt
00000000f011a2a5 OPS: 20 FD: 45 BD: 1 .+.+: kn->active#834
is that somewhere near the number of CPUs you have?
Anyway, there's very long "kn->active#..." chains in there, which seems
to suggest some annotation is all sorts of buggered.
next prev parent reply other threads:[~2020-05-26 19:56 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-26 17:43 [PATCH] locking/lockdep: Increase MAX_LOCKDEP_ENTRIES by half Waiman Long
2020-05-26 18:58 ` Qian Cai
2020-05-26 19:28 ` Qian Cai
2020-05-26 19:56 ` Peter Zijlstra [this message]
2020-05-26 20:17 ` Qian Cai
2020-05-26 20:30 ` Waiman Long
2020-05-26 21:24 ` Qian Cai
2020-05-26 21:27 ` Peter Zijlstra
2020-05-26 22:27 ` Waiman Long
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