linux-kernel - Re: [PATCH 7/8] serial: qcom-geni: disable interrupts during console writes

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Message-ID: <CAD=FV=UX_knVfrei4UPiR3DT=H81ybSjGeDGAsWc3n6q=PiFJg@mail.gmail.com>
Date: Wed, 4 Sep 2024 14:51:22 -0700
From: Doug Anderson <dianders@...omium.org>
To: Johan Hovold <johan+linaro@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jiri Slaby <jirislaby@...nel.org>, 
	Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konradybcio@...nel.org>, 
	Nícolas F . R . A . Prado <nfraprado@...labora.com>, 
	linux-arm-msm@...r.kernel.org, linux-serial@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/8] serial: qcom-geni: disable interrupts during console writes

Hi,

On Mon, Sep 2, 2024 at 8:26 AM Johan Hovold <johan+linaro@...nel.org> wrote:
>
> Disable the GENI interrupts during console writes to reduce the risk of
> having interrupt handlers spinning on the port lock on other cores for
> extended periods of time.
>
> This can, for example, reduce the total amount of time spent in the
> interrupt handler during boot of the x1e80100 CRD by up to a factor nine
> (e.g. from 274 ms to 30 ms) while the worst case processing time drops
> from 19 ms to 8 ms.
>
> Fixes: c4f528795d1a ("tty: serial: msm_geni_serial: Add serial driver support for GENI based QUP")
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

Reviewed-by: Douglas Anderson <dianders@...omium.org>