From: Reinette Chatre <reinette.chatre@intel.com>
To: James Morse <james.morse@arm.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>,
shameerali.kolothum.thodi@huawei.com,
Jamie Iles <jamie@nuviainc.com>,
D Scott Phillips OS <scott@os.amperecomputing.com>
Subject: Re: [PATCH 05/24] x86/resctrl: Pass the schema in resdir's private pointer
Date: Tue, 17 Nov 2020 13:49:56 -0800 [thread overview]
Message-ID: <f2726df3-a694-3265-16e3-057f8b7e2d92@intel.com> (raw)
In-Reply-To: <20201030161120.227225-6-james.morse@arm.com>
Hi James,
It is not clear what "resdir" mentioned in subject line refers to. Could
it be changed to "info dir"?
On 10/30/2020 9:11 AM, James Morse wrote:
> Moving properties that resctrl exposes to user-space into the core
> 'fs' code, (e.g. the name of the schema), means some of the functions
> that back the filesystem need the schema struct, but currently take the
> resource.
I think a simple addition would help to parse the above ...
" ... need the schema struct (to where the properties are moved), ..."
>
> Once the CDP resources are merged, the resource doesn't reflect the
> right level of information.
>
> For the info dirs that represent a control, the information needed
> is in the schema, as this is how the resource is being used. For the
> monitors, its the resource as L3CODE_MON doesn't make sense, and would
> monitor data too.
>
> This difference means the type of the private pointers varies
> between control and monitor info dirs.
>
> If the flags are RF_MON_INFO, its a struct rdt_resource. If the
> flags are RF_CTRL_INFO, its a struct resctrl_schema. Nothing in
> res_common_files[] has both flags.
>
> Signed-off-by: James Morse <james.morse@arm.com>
>
> ---
> Fake schema for monitors may simplify this if anyone thinks that is
> preferable.
> ---
> arch/x86/kernel/cpu/resctrl/rdtgroup.c | 37 +++++++++++++++++---------
> 1 file changed, 24 insertions(+), 13 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> index f79a5e548138..cb16454a6b0e 100644
> --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
...
> @@ -1794,6 +1803,7 @@ static int rdtgroup_mkdir_info_resdir(struct rdt_resource *r, char *name,
>
> static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
> {
> + struct resctrl_schema *s;
> struct rdt_resource *r;
> unsigned long fflags;
> char name[32];
> @@ -1809,9 +1819,10 @@ static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
> if (ret)
> goto out_destroy;
>
> - for_each_alloc_enabled_rdt_resource(r) {
> + list_for_each_entry(s, &resctrl_all_schema, list) {
> + r = s->res;
> fflags = r->fflags | RF_CTRL_INFO;
> - ret = rdtgroup_mkdir_info_resdir(r, r->name, fflags);
> + ret = rdtgroup_mkdir_info_resdir(s, r->name, fflags);
> if (ret)
> goto out_destroy;
> }
>
I think it would be helpful to add a comment here to compensate for the
symmetry that is removed ("for_each_alloc_enabled_rdt_resource()"
followed by a "for_each_mon_enabled_rdt_resource()").
Reinette
next prev parent reply other threads:[~2020-11-17 21:50 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-30 16:10 [PATCH 00/24] x86/resctrl: Merge the CDP resources James Morse
2020-10-30 16:10 ` [PATCH 01/24] x86/resctrl: Split struct rdt_resource James Morse
2020-11-17 19:20 ` Reinette Chatre
2021-03-12 17:10 ` James Morse
2020-10-30 16:10 ` [PATCH 02/24] x86/resctrl: Split struct rdt_domain James Morse
2020-11-17 19:22 ` Reinette Chatre
2020-10-30 16:10 ` [PATCH 03/24] x86/resctrl: Add resctrl_arch_get_num_closid() James Morse
2020-11-17 19:57 ` Reinette Chatre
2021-03-12 17:10 ` James Morse
2020-10-30 16:11 ` [PATCH 04/24] x86/resctrl: Add a separate schema list for resctrl James Morse
2020-11-17 21:29 ` Reinette Chatre
2021-03-12 17:10 ` James Morse
2020-10-30 16:11 ` [PATCH 05/24] x86/resctrl: Pass the schema in resdir's private pointer James Morse
2020-11-17 21:49 ` Reinette Chatre [this message]
2021-03-12 17:11 ` James Morse
2020-10-30 16:11 ` [PATCH 06/24] x86/resctrl: Store the effective num_closid in the schema James Morse
2020-11-17 22:04 ` Reinette Chatre
2021-03-12 17:13 ` James Morse
2020-10-30 16:11 ` [PATCH 07/24] x86/resctrl: Label the resources with their configuration type James Morse
2020-11-17 22:30 ` Reinette Chatre
2021-03-12 17:36 ` James Morse
2020-10-30 16:11 ` [PATCH 08/24] x86/resctrl: Walk the resctrl schema list instead of an arch list James Morse
2020-11-17 22:52 ` Reinette Chatre
2021-03-12 17:37 ` James Morse
2020-10-30 16:11 ` [PATCH 09/24] x86/resctrl: Change rdt_resource to resctrl_schema in pseudo_lock_region James Morse
2020-10-30 16:11 ` [PATCH 10/24] x86/resctrl: Move the schema names into struct resctrl_schema James Morse
2020-11-10 11:39 ` Jamie Iles
2020-11-11 18:11 ` James Morse
2020-11-17 23:11 ` Reinette Chatre
2021-03-12 17:38 ` James Morse
2020-10-30 16:11 ` [PATCH 11/24] x86/resctrl: Group staged configuration into a separate struct James Morse
2020-11-17 23:28 ` Reinette Chatre
2021-03-12 17:41 ` James Morse
2020-10-30 16:11 ` [PATCH 12/24] x86/resctrl: Add closid to the staged config James Morse
2020-11-17 23:46 ` Reinette Chatre
2021-03-12 17:43 ` James Morse
2020-10-30 16:11 ` [PATCH 13/24] x86/resctrl: Allow different CODE/DATA configurations to be staged James Morse
2020-11-18 0:30 ` Reinette Chatre
2020-10-30 16:11 ` [PATCH 14/24] x86/resctrl: Make update_domains() learn the affected closids James Morse
2020-10-30 16:11 ` [PATCH 15/24] x86/resctrl: Add a helper to read a closid's configuration James Morse
2020-10-30 16:11 ` [PATCH 16/24] x86/resctrl: Add a helper to read/set the CDP configuration James Morse
2020-10-30 16:11 ` [PATCH 17/24] x86/resctrl: Use cdp_enabled in rdt_domain_reconfigure_cdp() James Morse
2020-10-30 16:11 ` [PATCH 18/24] x86/resctrl: Pass configuration type to resctrl_arch_get_config() James Morse
2020-10-30 16:11 ` [PATCH 19/24] x86/resctrl: Make ctrlval arrays the same size James Morse
2020-10-30 16:11 ` [PATCH 20/24] x86/resctrl: Apply offset correction when config is staged James Morse
2020-10-30 16:11 ` [PATCH 21/24] x86/resctrl: Calculate the index from the configuration type James Morse
2020-10-30 16:11 ` [PATCH 22/24] x86/resctrl: Merge the ctrlval arrays James Morse
2020-10-30 16:11 ` [PATCH 23/24] x86/resctrl: Remove rdt_cdp_peer_get() James Morse
2020-10-30 16:11 ` [PATCH 24/24] x86/resctrl: Merge the CDP resources James Morse
2020-11-13 15:38 ` [PATCH 00/24] " Jamie Iles
2020-11-16 17:54 ` Reinette Chatre
2020-11-17 13:05 ` James Morse
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