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Message-ID: <ZU3GbHTA3x19h2Zi@google.com>
Date: Fri, 10 Nov 2023 13:58:04 +0800
From: Tzung-Bi Shih <tzungbi@...nel.org>
To: Kuan-Wei Chiu <visitorckw@...il.com>
Cc: bleung@...omium.org, groeck@...omium.org,
chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7] platform/chrome: Implement quickselect for median
calculation
On Fri, Nov 10, 2023 at 02:54:32AM +0800, Kuan-Wei Chiu wrote:
> In addition to the algorithmic improvement, this series includes
> several typo fixes to enhance the overall code quality and maintain
> consistency.
The typo fixes are not necessary to be in the same series. I would suggest
you separate the typo fixes to "an" (squash them) independent patch.
Please also use more specific prefix (e.g. "platform/chrome: sensorhub: ") to
make the title more clear.
> static int quickselect_test(void)
> {
> s64 *arr;
> s64 median_old, median_new;
> ktime_t start, end;
> s64 delta;
> const size_t array_length = 1000;
> const s64 seed = 1;
>
> arr = kmalloc(array_length * sizeof(s64), GFP_KERNEL);
> if (!arr)
> return -ENOMEM;
>
> init_array(arr, array_length, seed);
> start = ktime_get();
> median_old = cros_ec_sensor_ring_median(arr, array_length);
> end = ktime_get();
> delta = ktime_us_delta(end, start);
> printk(KERN_ALERT "time of original function: %lld\n", delta);
>
> init_array(arr, array_length, seed);
> start = ktime_get();
> median_new = cros_ec_sensor_ring_median_new(arr, array_length);
> end = ktime_get();
> delta = ktime_us_delta(end, start);
> printk(KERN_ALERT "time of new function: %lld\n", delta);
>
> kfree(arr);
>
> /* return 0 on success */
> return median_old != median_new;
> }
>
> /* Result:
> * time of original function: 897
> * time of new function: 16
> */
Could you also run the micro-benchmark for n = 64[2][3]?
[2] https://elixir.bootlin.com/linux/v6.6/source/include/linux/platform_data/cros_ec_sensorhub.h#L64
[3] https://elixir.bootlin.com/linux/v6.6/source/drivers/platform/chrome/cros_ec_sensorhub_ring.c#L154
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