[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20160128082840.GI3935@vireshk>
Date: Thu, 28 Jan 2016 13:58:40 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
Cc: linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
rjw@...ysocki.net, linux-pm@...r.kernel.org, pc@...ibm.com,
anton@...ba.org, ego@...ux.vnet.ibm.com,
shreyas@...ux.vnet.ibm.com, bsingharora@...il.com,
mpe@...erman.id.au
Subject: Re: [PATCH v7 3/6] cpufreq: powernv: Remove cpu_to_chip_id() from
hot-path
On 28-01-16, 12:55, Shilpasri G Bhat wrote:
> cpu_to_chip_id() does a DT walk through to find out the chip id by
> taking a contended device tree lock. This adds an unnecessary overhead
> in a hot path. So instead of calling cpu_to_chip_id() everytime cache
> the chip ids for all cores in the array 'core_to_chip_map' and use it
> in the hotpath.
>
> Reported-by: Anton Blanchard <anton@...ba.org>
> Signed-off-by: Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
> ---
> Changes from v6:
> - Minor changes to move the code 'cpumask_copy()' after 'core_to_chip_map'
> is allocated.
> - Move 'kfree(chips)' to a separate patch.
See, you weren't that bad :)
Just that you missed saying that individual patches contain
version-log in cover-letter :)
Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
--
viresh
Powered by blists - more mailing lists