linux-kernel - Re: [PATCH v2 17/24] selftests/resctrl: Replace count_bits with count_consecutive

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Message-ID: <455c986a-0d51-0302-d5c3-c6c0f1cc6bad@intel.com>
Date:   Fri, 21 Apr 2023 17:20:10 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        <linux-kselftest@...r.kernel.org>,
        Fenghua Yu <fenghua.yu@...el.com>,
        "Shuah Khan" <shuah@...nel.org>, <linux-kernel@...r.kernel.org>
CC:     Shaopeng Tan <tan.shaopeng@...fujitsu.com>
Subject: Re: [PATCH v2 17/24] selftests/resctrl: Replace count_bits with
 count_consecutive_bits()

Hi Ilpo,

On 4/18/2023 4:44 AM, Ilpo Järvinen wrote:
> CAT and CMT tests depends on masks being continuous.

The term used in the spec is "contiguous", using it here
may help to convey the goal.

> 
> Replace count_bits with more appropriate variant that counts
> consecutive bits.

Could you please elaborate why this is more appropriate and
why this is necessary? What is wrong with current solution?

Please note that cbm_mask in resctrl will always be contiguous.

Reinette