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From: James Morse <james.morse@arm.com>
To: Reinette Chatre <reinette.chatre@intel.com>,
	x86@kernel.org, linux-kernel@vger.kernel.org
Cc: Fenghua Yu <fenghua.yu@intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	H Peter Anvin <hpa@zytor.com>, Babu Moger <Babu.Moger@amd.com>,
	shameerali.kolothum.thodi@huawei.com,
	Jamie Iles <jamie@nuviainc.com>,
	D Scott Phillips OS <scott@os.amperecomputing.com>,
	lcherian@marvell.com, bobo.shaobowang@huawei.com,
	tan.shaopeng@fujitsu.com
Subject: Re: [PATCH v2 09/23] x86/resctrl: Switch over to the resctrl mbps_val list
Date: Wed, 27 Oct 2021 17:49:47 +0100	[thread overview]
Message-ID: <8dbfa092-685d-dc74-b8e5-449ad0ab5222@arm.com> (raw)
In-Reply-To: <af0d23a9-61b3-8a2b-7f4c-4d2d6d510238@intel.com>

Hi Reinette,

On 15/10/2021 23:26, Reinette Chatre wrote:
> On 10/1/2021 9:02 AM, James Morse wrote:
>> Updates to resctrl's software controller follow the same path as
>> other configuration updates, but they don't modify the hardware state.
>> rdtgroup_schemata_write() uses parse_line() and the resource's
>> ctrlval_parse function to stage the configuration.
> 
> parse_ctrlval ?
> 
>> resctrl_arch_update_domains() then updates the mbps_val[] array
>> instead, and resctrl_arch_update_domains() skips the rdt_ctrl_update()
>> call that would update hardware.
>>
>> This complicates the interface between resctrl's filesystem parts
>> and architecture specific code. It should be possible for mba_sc
>> to be completely implemented by the filesystem parts of resctrl. This
>> would allow it to work on a second architecture with no additional code.
>>
>> Change parse_bw() to write the configuration value directly to the
>> mba_sc[] array in the domain structure. Change rdtgroup_schemata_write()
> 
> mpbs_val[] array?
> 
>> to skip the call to resctrl_arch_update_domains(), meaning all the
>> mba_sc specific code in resctrl_arch_update_domains() can be removed.
>> On the read-side, show_doms() and update_mba_bw() are changed to read
>> the mba_sc[] array from the domain structure. With this,
> 
> mbps_val[] ?
> 
> Should rdtgroup_size_show() also get a similar snippet?

Yes! Good catch!


Thanks,

James

  reply	other threads:[~2021-10-27 16:49 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-01 16:02 [PATCH v2 00/23] x86/resctrl: Make resctrl_arch_rmid_read() return values in bytes James Morse
2021-10-01 16:02 ` [PATCH v2 01/23] x86/resctrl: Free the ctrlval arrays when domain_setup_mon_state() fails James Morse
2021-10-01 16:02 ` [PATCH v2 02/23] x86/resctrl: Fix kfree() of the wrong type in domain_add_cpu() James Morse
2021-10-01 16:02 ` [PATCH v2 03/23] x86/resctrl: Kill off alloc_enabled James Morse
2021-10-15 22:19   ` Reinette Chatre
2021-10-01 16:02 ` [PATCH v2 04/23] x86/resctrl: Merge mon_capable and mon_enabled James Morse
2021-10-19 23:18   ` Babu Moger
2021-10-22 18:30     ` James Morse
2021-10-01 16:02 ` [PATCH v2 05/23] x86/resctrl: Add domain online callback for resctrl work James Morse
2021-10-15 22:19   ` Reinette Chatre
2021-10-22 18:30     ` James Morse
2021-10-19 23:19   ` Babu Moger
2021-10-22 18:30     ` James Morse
2021-10-01 16:02 ` [PATCH v2 06/23] x86/resctrl: Group struct rdt_hw_domain cleanup James Morse
2021-10-01 16:02 ` [PATCH v2 07/23] x86/resctrl: Add domain offline callback for resctrl work James Morse
2021-10-19 23:19   ` Babu Moger
2021-10-22 18:30     ` James Morse
2021-10-01 16:02 ` [PATCH v2 08/23] x86/resctrl: Create mba_sc configuration in the rdt_domain James Morse
2021-10-15 22:26   ` Reinette Chatre
2021-10-22 18:30     ` James Morse
2021-10-01 16:02 ` [PATCH v2 09/23] x86/resctrl: Switch over to the resctrl mbps_val list James Morse
2021-10-15 22:26   ` Reinette Chatre
2021-10-27 16:49     ` James Morse [this message]
2021-10-01 16:02 ` [PATCH v2 10/23] x86/resctrl: Remove architecture copy of mbps_val James Morse
2021-10-15 22:27   ` Reinette Chatre
2021-10-27 16:49     ` James Morse
2021-10-01 16:02 ` [PATCH v2 11/23] x86/resctrl: Remove set_mba_sc()s control array re-initialisation James Morse
2021-10-01 16:02 ` [PATCH v2 12/23] x86/resctrl: Abstract and use supports_mba_mbps() James Morse
2021-10-07  6:13   ` tan.shaopeng
2021-10-27 16:50     ` James Morse
2021-10-15 22:28   ` Reinette Chatre
2021-10-01 16:02 ` [PATCH v2 13/23] x86/resctrl: Allow update_mba_bw() to update controls directly James Morse
2021-10-15 22:28   ` Reinette Chatre
2021-10-27 16:49     ` James Morse
2021-10-01 16:02 ` [PATCH v2 14/23] x86/resctrl: Calculate bandwidth from the previous __mon_event_count() chunks James Morse
2021-10-15 22:28   ` Reinette Chatre
2021-10-27 16:50     ` James Morse
2021-10-27 20:41       ` Reinette Chatre
2021-10-29 15:50         ` James Morse
2021-10-29 22:22           ` Reinette Chatre
2021-10-01 16:02 ` [PATCH v2 15/23] x86/recstrl: Add per-rmid arch private storage for overflow and chunks James Morse
2021-10-15 22:29   ` Reinette Chatre
2021-10-01 16:02 ` [PATCH v2 16/23] x86/recstrl: Allow per-rmid arch private storage to be reset James Morse
2021-10-07  6:16   ` tan.shaopeng
2021-10-01 16:02 ` [PATCH v2 17/23] x86/resctrl: Abstract __rmid_read() James Morse
2021-10-15 22:29   ` Reinette Chatre
2021-10-19 23:20   ` Babu Moger
2021-10-20 18:15     ` Reinette Chatre
2021-10-20 19:22       ` Babu Moger
2021-10-20 20:28         ` Reinette Chatre
2021-10-27 16:50           ` James Morse
2021-10-27 18:59             ` Babu Moger
2021-10-01 16:02 ` [PATCH v2 18/23] x86/resctrl: Pass the required parameters into resctrl_arch_rmid_read() James Morse
2021-10-15 22:30   ` Reinette Chatre
2021-10-01 16:02 ` [PATCH v2 19/23] x86/resctrl: Move mbm_overflow_count() " James Morse
2021-10-01 16:02 ` [PATCH v2 20/23] x86/resctrl: Move get_corrected_mbm_count() " James Morse
2021-10-01 16:03 ` [PATCH v2 21/23] x86/resctrl: Rename and change the units of resctrl_cqm_threshold James Morse
2021-10-01 16:03 ` [PATCH v2 22/23] x86/resctrl: Add resctrl_rmid_realloc_limit to abstract x86's boot_cpu_data James Morse
2021-10-01 16:03 ` [PATCH v2 23/23] x86/resctrl: Make resctrl_arch_rmid_read() return values in bytes James Morse
2021-10-13  2:09 ` [PATCH v2 00/23] " tan.shaopeng
2021-10-19 23:17 ` Babu Moger

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