From: Marc Kleine-Budde <mkl@pengutronix.de>
To: David Jander <david@protonic.nl>
Cc: Mark Brown <broonie@kernel.org>,
linux-spi@vger.kernel.org, Oleksij Rempel <ore@pengutronix.de>,
Andrew Lunn <andrew@lunn.ch>
Subject: Re: [RFC] A new SPI API for fast, low-latency regmap peripheral access
Date: Thu, 19 May 2022 10:24:07 +0200 [thread overview]
Message-ID: <20220519082407.ef2ys6pnbb2meyiq@pengutronix.de> (raw)
In-Reply-To: <20220519101238.516c5f9e@erd992>
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On 19.05.2022 10:12:38, David Jander wrote:
> I just tried this out by re-writing the statistics code using u64_stats_sync
> and per-cpu statistics, which get totaled on sysfs read access as Andrew Lunn
> suggested.
> The results are truly amazing!
>
> The overhead caused by statistics in my test dropped from 43us to just 1-2us.
\o/
> This was tested on a 64-bit machine though, so I don't know how it will affect
> 32-bit systems. Nor do I have an easy means of testing this. Any ideas?
Test on an imx6 :)
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Embedded Linux | https://www.pengutronix.de |
Vertretung West/Dortmund | Phone: +49-231-2826-924 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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next prev parent reply other threads:[~2022-05-19 8:24 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-12 14:34 [RFC] A new SPI API for fast, low-latency regmap peripheral access David Jander
2022-05-12 20:37 ` Mark Brown
2022-05-12 22:12 ` Mark Brown
2022-05-13 12:46 ` David Jander
2022-05-13 19:36 ` Mark Brown
2022-05-16 16:28 ` Marc Kleine-Budde
2022-05-16 17:46 ` Mark Brown
2022-05-17 10:24 ` David Jander
2022-05-17 11:57 ` Mark Brown
2022-05-17 13:09 ` David Jander
2022-05-17 13:43 ` Mark Brown
2022-05-17 15:16 ` David Jander
2022-05-17 18:17 ` Mark Brown
2022-05-19 8:12 ` David Jander
2022-05-19 8:24 ` Marc Kleine-Budde [this message]
2022-05-19 12:14 ` Andrew Lunn
2022-05-19 14:33 ` David Jander
2022-05-19 15:21 ` Andrew Lunn
2022-05-20 15:22 ` Mark Brown
2022-05-23 14:48 ` David Jander
2022-05-23 14:59 ` Marc Kleine-Budde
2022-05-24 11:30 ` David Jander
2022-05-24 19:46 ` Mark Brown
2022-05-25 14:39 ` David Jander
2022-05-13 12:10 ` Andrew Lunn
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