linux-kernel - Re: [PATCH] Doc: lockdep: add information about performance impact

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Message-ID: <20181009155818.GD9259@arm.com>
Date:   Tue, 9 Oct 2018 16:58:18 +0100
From:   Will Deacon <will.deacon@....com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Lukasz Luba <l.luba@...tner.samsung.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        b.zolnierkie@...sung.com, mingo@...hat.com, corbet@....net
Subject: Re: [PATCH] Doc: lockdep: add information about performance impact

On Tue, Oct 09, 2018 at 05:43:59PM +0200, Peter Zijlstra wrote:
> On Tue, Oct 09, 2018 at 05:39:27PM +0200, Lukasz Luba wrote:
> > This patch add some warning related to performance drop.
> > It should be mentioned that this is not for free
> > and the platfrom resources (cache, bus interconnect, etc.)
> > will be used more frequently.
> 
> To me this reads a bit like: water is wet.
> 
> Is this really needed?

I don't think so -- this is a debug option under "kernel hacking". Surely
the perf hit comes with the territory.

Will