From: Sudeep Holla <sudeep.holla@arm•com>
To: Yunfeng Ye <yeyunfeng@huawei•com>
Cc: kstewart@linuxfoundation•org, mark.rutland@arm•com,
lorenzo.pieralisi@arm•com, hushiyuan@huawei•com,
catalin.marinas@arm•com, Sudeep Holla <sudeep.holla@arm•com>,
"linux-kernel@vger•kernel.org" <linux-kernel@vger•kernel.org>,
linfeilong@huawei•com, David.Laight@ACULAB•COM,
gregkh@linuxfoundation•org, tglx@linutronix•de,
wuyun.wu@huawei•com, will@kernel•org,
linux-arm-kernel@lists•infradead.org
Subject: Re: [PATCH v5] arm64: psci: Reduce the waiting time for cpu_psci_cpu_kill()
Date: Mon, 21 Oct 2019 12:21:14 +0100 [thread overview]
Message-ID: <20191021112114.GC21581@bogus> (raw)
In-Reply-To: <710429cc-4d88-b7c3-b068-5459cf8133b5@huawei.com>
On Mon, Oct 21, 2019 at 06:52:16PM +0800, Yunfeng Ye wrote:
> In cases like suspend-to-disk and suspend-to-ram, a large number of CPU
> cores need to be shut down. At present, the CPU hotplug operation is
> serialised, and the CPU cores can only be shut down one by one. In this
> process, if PSCI affinity_info() does not return LEVEL_OFF quickly,
> cpu_psci_cpu_kill() needs to wait for 10ms. If hundreds of CPU cores
> need to be shut down, it will take a long time.
>
> Normally, there is no need to wait 10ms in cpu_psci_cpu_kill(). So
> change the wait interval from 10 ms to max 1 ms and use usleep_range()
> instead of msleep() for more accurate timer.
>
> In addition, reducing the time interval will increase the messages
> output, so remove the "Retry ..." message, instead, track time and
> output to the the successful message.
Reviewed-by: Sudeep Holla <sudeep.holla@arm•com>
--
Regards,
Sudeep
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists•infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
prev parent reply other threads:[~2019-10-21 11:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-21 10:52 [PATCH v5] arm64: psci: Reduce the waiting time for cpu_psci_cpu_kill() Yunfeng Ye
2019-10-21 11:21 ` Sudeep Holla [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20191021112114.GC21581@bogus \
--to=sudeep.holla@arm$(echo .)com \
--cc=David.Laight@ACULAB$(echo .)COM \
--cc=catalin.marinas@arm$(echo .)com \
--cc=gregkh@linuxfoundation$(echo .)org \
--cc=hushiyuan@huawei$(echo .)com \
--cc=kstewart@linuxfoundation$(echo .)org \
--cc=linfeilong@huawei$(echo .)com \
--cc=linux-arm-kernel@lists$(echo .)infradead.org \
--cc=linux-kernel@vger$(echo .)kernel.org \
--cc=lorenzo.pieralisi@arm$(echo .)com \
--cc=mark.rutland@arm$(echo .)com \
--cc=tglx@linutronix$(echo .)de \
--cc=will@kernel$(echo .)org \
--cc=wuyun.wu@huawei$(echo .)com \
--cc=yeyunfeng@huawei$(echo .)com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox