From mboxrd@z Thu Jan 1 00:00:00 1970 From: will.deacon@arm.com (Will Deacon) Date: Tue, 9 Oct 2018 16:58:18 +0100 Subject: [PATCH] Doc: lockdep: add information about performance impact In-Reply-To: <20181009154359.GB5728@hirez.programming.kicks-ass.net> References: <20181009153935eucas1p2dec146575ed5fefd4a0b2b6cb9bac056~b_ujkjRd31303013030eucas1p2C@eucas1p2.samsung.com> <20181009154359.GB5728@hirez.programming.kicks-ass.net> Message-ID: <20181009155818.GD9259@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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