From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] Doc: lockdep: add information about performance impact
Date: Tue, 9 Oct 2018 16:58:18 +0100 [thread overview]
Message-ID: <20181009155818.GD9259@arm.com> (raw)
In-Reply-To: <20181009154359.GB5728@hirez.programming.kicks-ass.net>
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
WARNING: multiple messages have this Message-ID (diff)
From: Will Deacon <will.deacon@arm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Lukasz Luba <l.luba@partner.samsung.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, b.zolnierkie@samsung.com,
mingo@redhat.com, corbet@lwn.net
Subject: Re: [PATCH] Doc: lockdep: add information about performance impact
Date: Tue, 9 Oct 2018 16:58:18 +0100 [thread overview]
Message-ID: <20181009155818.GD9259@arm.com> (raw)
In-Reply-To: <20181009154359.GB5728@hirez.programming.kicks-ass.net>
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
next prev parent reply other threads:[~2018-10-09 15:58 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20181009153935eucas1p2dec146575ed5fefd4a0b2b6cb9bac056@eucas1p2.samsung.com>
2018-10-09 15:39 ` [PATCH] Doc: lockdep: add information about performance impact Lukasz Luba
2018-10-09 15:39 ` Lukasz Luba
2018-10-09 15:43 ` Peter Zijlstra
2018-10-09 15:43 ` Peter Zijlstra
2018-10-09 15:58 ` Will Deacon [this message]
2018-10-09 15:58 ` Will Deacon
2018-10-10 10:18 ` Russell King - ARM Linux
2018-10-10 10:18 ` Russell King - ARM Linux
2018-10-09 16:06 ` Lukasz Luba
2018-10-09 16:06 ` Lukasz Luba
2018-10-10 10:31 ` Robin Murphy
2018-10-10 10:31 ` Robin Murphy
2018-10-10 11:49 ` Lukasz Luba
2018-10-10 11:49 ` Lukasz Luba
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