Alsa-Devel Archive on lore.kernel.org
 help / color / Atom feed
From: 王文虎 <wenhu.wang@vivo.com>
To: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: ohad@wizery.com, linux-wireless@vger.kernel.org,
	alsa-devel@alsa-project.org, elder@kernel.org,
	linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org,
	linux-kernel@vger.kernel.org, ath10k@lists.infradead.org,
	ath11k@lists.infradead.org, agross@kernel.org,
	srinivas.kandagatla@linaro.org, sibis@codeaurora.org,
	netdev@vger.kernel.org, kuba@kernel.org, davem@davemloft.net,
	kvalo@codeaurora.org
Subject: Re:Re: [PATCH] soc: qmi: allow user to set handle wq to hiprio
Date: Sun, 2 Aug 2020 21:14:47 +0800 (GMT+08:00)
Message-ID: <ADUAnwD8DVByMMSsrG-r3Kri.3.1596374087585.Hmail.wenhu.wang@vivo.com> (raw)
In-Reply-To: <20200727204521.GB229995@builder.lan>


>> Currently the qmi_handle is initialized single threaded and strictly
>> ordered with the active set to 1. This is pretty simple and safe but
>> sometimes ineffency. So it is better to allow user to decide whether
>> a high priority workqueue should be used.
>
>Can you please describe a scenario where this is needed/desired and
>perhaps also comment on why this is not always desired?
>

Well, one scenario is that when the AP wants to check the status of the
subsystems and the whole QMI data path. It first sends out an indication
which asks the subsystems to report their status. After the subsystems send
responses to the AP, the responses then are queued on the workqueue of
the QMI handler. Actually the AP is configured to do the check in a specific
interval regularly. And it check the report counts within a specific delay after
it sends out the related indication. When the AP has been under a heavy
load for long, the reports are queue their without CPU resource to update
the report counts within the specific delay. As a result, the thread that checks
the report counts takes it misleadingly that the QMI data path or the subsystems
are crashed.

The patch can really resolve the problem mentioned abolve.

For narmal situations, it is enough to just use normal priority QMI workqueue.

>Regards,
>Bjorn
>
>> 
>> Signed-off-by: Wang Wenhu <wenhu.wang@vivo.com>
>> ---
>>  drivers/net/ipa/ipa_qmi.c             | 4 ++--
>>  drivers/net/wireless/ath/ath10k/qmi.c | 2 +-
>>  drivers/net/wireless/ath/ath11k/qmi.c | 2 +-
>>  drivers/remoteproc/qcom_sysmon.c      | 2 +-
>>  drivers/slimbus/qcom-ngd-ctrl.c       | 4 ++--
>>  drivers/soc/qcom/pdr_interface.c      | 4 ++--
>>  drivers/soc/qcom/qmi_interface.c      | 9 +++++++--
>>  include/linux/soc/qcom/qmi.h          | 3 ++-
>>  samples/qmi/qmi_sample_client.c       | 4 ++--
>>  9 files changed, 20 insertions(+), 14 deletions(-)


  reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-27 15:03 王文虎
2020-07-27 20:45 ` Bjorn Andersson
2020-08-02 13:14   ` 王文虎 [this message]
2020-08-05 13:55     ` Alex Elder

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=ADUAnwD8DVByMMSsrG-r3Kri.3.1596374087585.Hmail.wenhu.wang@vivo.com \
    --to=wenhu.wang@vivo.com \
    --cc=agross@kernel.org \
    --cc=alsa-devel@alsa-project.org \
    --cc=ath10k@lists.infradead.org \
    --cc=ath11k@lists.infradead.org \
    --cc=bjorn.andersson@linaro.org \
    --cc=davem@davemloft.net \
    --cc=elder@kernel.org \
    --cc=kuba@kernel.org \
    --cc=kvalo@codeaurora.org \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-remoteproc@vger.kernel.org \
    --cc=linux-wireless@vger.kernel.org \
    --cc=netdev@vger.kernel.org \
    --cc=ohad@wizery.com \
    --cc=sibis@codeaurora.org \
    --cc=srinivas.kandagatla@linaro.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Alsa-Devel Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/alsa-devel/0 alsa-devel/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 alsa-devel alsa-devel/ https://lore.kernel.org/alsa-devel \
		alsa-devel@alsa-project.org
	public-inbox-index alsa-devel

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.alsa-project.alsa-devel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git