linux-kernel - Re: [PATCH v3 1/5] selftests/resctrl: Fix set up schemata with 100% allocation on first run in MBM test

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Message-ID: <9da9bf85-fcaf-78ac-85f2-584a17a21af9@intel.com>
Date:   Mon, 7 Nov 2022 16:04:07 -0800
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Shaopeng Tan <tan.shaopeng@...fujitsu.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Shuah Khan <shuah@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH v3 1/5] selftests/resctrl: Fix set up schemata with 100%
 allocation on first run in MBM test

Hi Shaopeng,

On 11/1/2022 2:43 AM, Shaopeng Tan wrote:
> There is a comment "Set up shemata with 100% allocation on the first run"
> in function mbm_setup(), but there is an increment bug and the condition
> "num_of_runs == 0" will never be met and write_schemata() will never be
> called to set schemata to 100%. Even if write_schemata() is called in MBM
> test, since it is not supported for MBM test it does not set the schemata.
> This is currently fine because resctrl_val_parm->mum_resctrlfs is always 1
> and umount/mount will be run in each test to set the schemata to 100%.
> 
> To support the usage when MBM test does not unmount/remount resctrl
> filesystem before the test starts, fix to call write_schemata() and
> set schemata properly when the function is called for the first time.
> 
> Also, remove static local variable 'num_of_runs' because this is not
> needed as there is resctrl_val_param->num_of_runs which should be used
> instead like in cat_setup().
> 
> Signed-off-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>

Thank you very much.

Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>

Reinette