| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <7c9bcb5c-0626-495d-b581-2bcbdf8d8699@amd.com>
Date: Tue, 1 Jul 2025 14:48:30 -0500
From: "Moger, Babu" <babu.moger@....com>
To: Reinette Chatre <reinette.chatre@...el.com>, corbet@....net,
tony.luck@...el.com, Dave.Martin@....com, james.morse@....com,
tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
dave.hansen@...ux.intel.com
Cc: x86@...nel.org, hpa@...or.com, akpm@...ux-foundation.org,
rostedt@...dmis.org, paulmck@...nel.org, thuth@...hat.com, ardb@...nel.org,
gregkh@...uxfoundation.org, seanjc@...gle.com, thomas.lendacky@....com,
pawan.kumar.gupta@...ux.intel.com, manali.shukla@....com,
perry.yuan@....com, kai.huang@...el.com, peterz@...radead.org,
xiaoyao.li@...el.com, kan.liang@...ux.intel.com, mario.limonciello@....com,
xin3.li@...el.com, gautham.shenoy@....com, xin@...or.com,
chang.seok.bae@...el.com, fenghuay@...dia.com, peternewman@...gle.com,
maciej.wieczor-retman@...el.com, eranian@...gle.com,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v14 28/32] fs/resctrl: Introduce mbm_L3_assignments to
list assignments in a group
Hi Reinette,
On 6/25/25 18:27, Reinette Chatre wrote:
> Hi Babu,
>
> On 6/13/25 2:05 PM, Babu Moger wrote:
>> Introduce the interface to display the assignment states for resctrl group
>
> "Introduce the mbm_L3_assignments resctrl file associated with
> CTRL_MON an MON resource groups to display the counter assignment
> states of the resource group when "mbm_event" counter assignment
> mode is enabled."
Sure.
>
>> when "mbm_event" mdoe is enabled.
>
> "mdoe" -> "counter assignment mode"
>
Sure.
>>
>> The list is displayed in the following format:
>> <Event>:<Domain id>=<Assignment state>
>
> Similar to previous note, please add syntax for multiple domains to avoid
> it appearing that each domain is on one line.
The list is displayed in the following format:
<Event>:<Domain id>=<Assignment state>;<Domain id>=<Assignment state>
>
>>
>> Event: A valid MBM event listed in
>> /sys/fs/resctrl/info/L3_MON/event_configs directory.
>>
>> Domain ID: A valid domain ID.
>>
>> The assignment state can be one of the following:
>>
>> _ : No counter assigned.
>>
>> e : Counter assigned exclusively.
>>
>> Example:
>> To list the assignment states for the default group
>> $ cd /sys/fs/resctrl
>> $ cat /sys/fs/resctrl/mbm_L3_assignments
>> mbm_total_bytes:0=e;1=e
>> mbm_local_bytes:0=e;1=e
>>
>> Signed-off-by: Babu Moger <babu.moger@....com>
>> ---
>> v14: Added missed rdtgroup_kn_lock_live on failure case.
>> Updated the user doc resctrl.rst to clarify counter assignments.
>> Updated the changelog.
>>
>> v13: Changelog update.
>> Few changes in mbm_L3_assignments_show() after moving the event config to evt_list.
>> Resolved conflicts caused by the recent FS/ARCH code restructure.
>> The rdtgroup.c/monitor.c files have been split between the FS and ARCH directories.
>>
>> v12: New patch:
>> Assignment interface moved inside the group based the discussion
>> https://lore.kernel.org/lkml/CALPaoCiii0vXOF06mfV=kVLBzhfNo0SFqt4kQGwGSGVUqvr2Dg@mail.gmail.com/#t
>> ---
>> Documentation/filesystems/resctrl.rst | 28 ++++++++++++++
>> fs/resctrl/monitor.c | 1 +
>> fs/resctrl/rdtgroup.c | 54 +++++++++++++++++++++++++++
>> 3 files changed, 83 insertions(+)
>>
>> diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst
>> index f94c7c387416..a232a0b1356c 100644
>> --- a/Documentation/filesystems/resctrl.rst
>> +++ b/Documentation/filesystems/resctrl.rst
>> @@ -516,6 +516,34 @@ When the "mba_MBps" mount option is used all CTRL_MON groups will also contain:
>> /sys/fs/resctrl/info/L3_MON/mon_features changes the input
>> event.
>>
>> +"mbm_L3_assignments":
>> + Exists when "mbm_event" mode is supported and lists the counter
>
> ""mbm_event" mode" -> "mbm_event" counter assignment mode"
>
>> + assignment states for the group.
>
> "for the group" -> "of the group"?
>
Sure.
>> +
>> + The assignment list is displayed in the following format:
>> +
>> + <Event>:<Domain ID>=<Assignment state>
>
> Same comment about syntax example.
>
Sure.
>> +
>> + Event: A valid MBM event in the
>> + /sys/fs/resctrl/info/L3_MON/event_configs directory.
>> +
>> + Domain ID: A valid domain ID.
>> +
>> + Assignment states:
>> +
>> + _ : No counter assigned.
>> +
>> + e : Counter assigned exclusively.
>> +
>> + Example:
>> + To display the counter assignment states for the default group.
>> + ::
>> +
>> + # cd /sys/fs/resctrl
>> + # cat /sys/fs/resctrl/mbm_L3_assignments
>> + mbm_total_bytes:0=e;1=e
>> + mbm_local_bytes:0=e;1=e
>> +
>> Resource allocation rules
>> -------------------------
>>
>> diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
>> index 1ec2efd50273..618c94cd1ad8 100644
>> --- a/fs/resctrl/monitor.c
>> +++ b/fs/resctrl/monitor.c
>> @@ -959,6 +959,7 @@ int resctrl_mon_resource_init(void)
>> resctrl_file_fflags_init("event_filter", RFTYPE_ASSIGN_CONFIG);
>> resctrl_file_fflags_init("mbm_assign_on_mkdir", RFTYPE_MON_INFO |
>> RFTYPE_RES_CACHE);
>> + resctrl_file_fflags_init("mbm_L3_assignments", RFTYPE_MON_BASE);
>> }
>>
>> return 0;
>> diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
>> index 128a9db339f3..18ec65801dbb 100644
>> --- a/fs/resctrl/rdtgroup.c
>> +++ b/fs/resctrl/rdtgroup.c
>> @@ -2081,6 +2081,54 @@ static ssize_t resctrl_mbm_assign_on_mkdir_write(struct kernfs_open_file *of,
>> return ret ?: nbytes;
>> }
>>
>> +static int mbm_L3_assignments_show(struct kernfs_open_file *of, struct seq_file *s, void *v)
>> +{
>> + struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
>> + struct rdt_mon_domain *d;
>> + struct rdtgroup *rdtgrp;
>> + struct mon_evt *mevt;
>> + int ret = 0;
>> + bool sep;
>> +
>> + rdtgrp = rdtgroup_kn_lock_live(of->kn);
>> + if (!rdtgrp) {
>> + ret = -ENOENT;
>> + goto out_assign;
>
> out_assign -> out_unlock
>
Sure.
>> + }
>> +
>> + rdt_last_cmd_clear();
>> + if (!resctrl_arch_mbm_cntr_assign_enabled(r)) {
>> + rdt_last_cmd_puts("mbm_event mode is not enabled\n");
>> + ret = -ENOENT;
>> + goto out_assign;
>> + }
>> +
>> + for (mevt = &mon_event_all[0]; mevt < &mon_event_all[QOS_NUM_EVENTS]; mevt++) {
>> + if (!mevt->enabled || !resctrl_is_mbm_event(mevt->evtid))
>> + continue;
>
> (use macro and mon_evt::rid)
>
Sure.
>> +
>> + sep = false;
>> + seq_printf(s, "%s:", mevt->name);
>> + list_for_each_entry(d, &r->mon_domains, hdr.list) {
>> + if (sep)
>> + seq_putc(s, ';');
>> +
>> + if (mbm_cntr_get(r, d, rdtgrp, mevt->evtid) >= 0)
>> + seq_printf(s, "%d=e", d->hdr.id);
>> + else
>> + seq_printf(s, "%d=_", d->hdr.id);
>> +
>> + sep = true;
>> + }
>> + seq_putc(s, '\n');
>> + }
>> +
>> +out_assign:
>> + rdtgroup_kn_unlock(of->kn);
>> +
>> + return ret;
>> +}
>> +
>> /* rdtgroup information files for one cache resource. */
>> static struct rftype res_common_files[] = {
>> {
>> @@ -2219,6 +2267,12 @@ static struct rftype res_common_files[] = {
>> .seq_show = event_filter_show,
>> .write = event_filter_write,
>> },
>> + {
>> + .name = "mbm_L3_assignments",
>> + .mode = 0444,
>> + .kf_ops = &rdtgroup_kf_single_ops,
>> + .seq_show = mbm_L3_assignments_show,
>> + },
>> {
>> .name = "mbm_assign_mode",
>> .mode = 0444,
>
> Reinette
>
--
Thanks
Babu Moger
Powered by blists - more mailing lists