From: Byungchul Park <byungchul.park@lge.com>
To: Bart Van Assche <Bart.VanAssche@wdc.com>
Cc: "mingo@kernel.org" <mingo@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"peterz@infradead.org" <peterz@infradead.org>,
"hch@infradead.org" <hch@infradead.org>,
"amir73il@gmail.com" <amir73il@gmail.com>,
"linux-xfs@vger.kernel.org" <linux-xfs@vger.kernel.org>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"oleg@redhat.com" <oleg@redhat.com>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"darrick.wong@oracle.com" <darrick.wong@oracle.com>,
"johannes.berg@intel.com" <johannes.berg@intel.com>,
"max.byungchul.park@gmail.com" <max.byungchul.park@gmail.com>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"idryomov@gmail.com" <idryomov@gmail.com>,
"tj@kernel.org" <tj@kernel.org>,
"kernel-team@lge.com" <kernel-team@lge.com>,
"david@fromorbit.com" <david@fromorbit.com>
Subject: Re: [RESEND PATCH 1/3] completion: Add support for initializing completion with lockdep_map
Date: Wed, 25 Oct 2017 20:49:38 +0900 [thread overview]
Message-ID: <20171025114938.GA3223@X58A-UD3R> (raw)
In-Reply-To: <1508915222.2947.15.camel@wdc.com>
On Wed, Oct 25, 2017 at 07:07:06AM +0000, Bart Van Assche wrote:
> > Please, point out logical problems of cross-release than saying it's
> > impossbile according to the paper.
>
> Isn't that the same? If it's impossible to use lock-graphs for detecting deadlocks
> in programs that use mutexes, semaphores and condition variables without triggering
> false positives that means that every approach that tries to detect deadlocks and
> that is based on lock graphs, including cross-release, must report false positives
> for certain programs.
Right. That's why I'm currently trying to assign lock classes properly
where false positives were reported. You seems to say there is another
cause of false positives. If yes, please let me know what it is. If you
do with an example, it would be more helpful for me to understand you.
WARNING: multiple messages have this Message-ID (diff)
From: Byungchul Park <byungchul.park@lge.com>
To: Bart Van Assche <Bart.VanAssche@wdc.com>
Cc: "mingo@kernel.org" <mingo@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"peterz@infradead.org" <peterz@infradead.org>,
"hch@infradead.org" <hch@infradead.org>,
"amir73il@gmail.com" <amir73il@gmail.com>,
"linux-xfs@vger.kernel.org" <linux-xfs@vger.kernel.org>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"oleg@redhat.com" <oleg@redhat.com>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"darrick.wong@oracle.com" <darrick.wong@oracle.com>,
"johannes.berg@intel.com" <johannes.berg@intel.com>,
"max.byungchul.park@gmail.com" <max.byungchul.park@gmail.com>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"idryomov@gmail.com" <idryomov@gmail.com>,
"tj@kernel.org" <tj@kernel.org>,
"kernel-team@lge.com" <kernel-team@lge.com>,
"david@fromorbit.com" <david@fromorbit.com>
Subject: Re: [RESEND PATCH 1/3] completion: Add support for initializing completion with lockdep_map
Date: Wed, 25 Oct 2017 20:49:38 +0900 [thread overview]
Message-ID: <20171025114938.GA3223@X58A-UD3R> (raw)
In-Reply-To: <1508915222.2947.15.camel@wdc.com>
On Wed, Oct 25, 2017 at 07:07:06AM +0000, Bart Van Assche wrote:
> > Please, point out logical problems of cross-release than saying it's
> > impossbile according to the paper.
>
> Isn't that the same? If it's impossible to use lock-graphs for detecting deadlocks
> in programs that use mutexes, semaphores and condition variables without triggering
> false positives that means that every approach that tries to detect deadlocks and
> that is based on lock graphs, including cross-release, must report false positives
> for certain programs.
Right. That's why I'm currently trying to assign lock classes properly
where false positives were reported. You seems to say there is another
cause of false positives. If yes, please let me know what it is. If you
do with an example, it would be more helpful for me to understand you.
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next prev parent reply other threads:[~2017-10-25 11:49 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-18 9:38 Fix false positive by LOCKDEP_CROSSRELEASE Byungchul Park
2017-10-18 9:38 ` Byungchul Park
2017-10-18 9:38 ` [RESEND PATCH 1/3] completion: Add support for initializing completion with lockdep_map Byungchul Park
2017-10-18 9:38 ` Byungchul Park
2017-10-19 23:24 ` Bart Van Assche
2017-10-19 23:24 ` Bart Van Assche
2017-10-20 6:14 ` Byungchul Park
2017-10-20 6:14 ` Byungchul Park
2017-10-20 6:34 ` Thomas Gleixner
2017-10-20 6:34 ` Thomas Gleixner
2017-10-20 19:58 ` Bart Van Assche
2017-10-20 19:58 ` Bart Van Assche
2017-10-20 19:58 ` Bart Van Assche
2017-10-21 2:23 ` Byungchul Park
2017-10-21 2:23 ` Byungchul Park
2017-10-22 14:34 ` Bart Van Assche
2017-10-22 14:34 ` Bart Van Assche
2017-10-23 2:08 ` Byungchul Park
2017-10-23 2:08 ` Byungchul Park
2017-10-25 7:07 ` Bart Van Assche
2017-10-25 7:07 ` Bart Van Assche
2017-10-25 11:49 ` Byungchul Park [this message]
2017-10-25 11:49 ` Byungchul Park
2017-10-18 9:38 ` [RESEND PATCH 2/3] lockdep: Remove unnecessary acquisitions wrt workqueue flush Byungchul Park
2017-10-18 9:38 ` Byungchul Park
2017-10-18 9:38 ` [RESEND PATCH 3/3] lockdep: Assign a lock_class per gendisk used for wait_for_completion() Byungchul Park
2017-10-18 9:38 ` Byungchul Park
2017-10-18 9:59 ` Ingo Molnar
2017-10-18 9:59 ` Ingo Molnar
2017-10-19 1:57 ` Byungchul Park
2017-10-19 1:57 ` Byungchul Park
2017-10-18 14:29 ` Fix false positive by LOCKDEP_CROSSRELEASE Bart Van Assche
2017-10-18 14:29 ` Bart Van Assche
2017-10-19 1:57 ` Byungchul Park
2017-10-19 1:57 ` Byungchul Park
2017-10-19 14:52 ` Bart Van Assche
2017-10-19 14:52 ` Bart Van Assche
2017-10-19 14:52 ` Bart Van Assche
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