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Message-ID: <166604564017.5345.6396405092493072988.stgit@bmoger-ubuntu>
Date: Mon, 17 Oct 2022 17:27:20 -0500
From: Babu Moger <babu.moger@....com>
To: <corbet@....net>, <reinette.chatre@...el.com>,
<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>
CC: <fenghua.yu@...el.com>, <dave.hansen@...ux.intel.com>,
<x86@...nel.org>, <hpa@...or.com>, <paulmck@...nel.org>,
<akpm@...ux-foundation.org>, <quic_neeraju@...cinc.com>,
<rdunlap@...radead.org>, <damien.lemoal@...nsource.wdc.com>,
<songmuchun@...edance.com>, <peterz@...radead.org>,
<jpoimboe@...nel.org>, <pbonzini@...hat.com>, <babu.moger@....com>,
<chang.seok.bae@...el.com>, <pawan.kumar.gupta@...ux.intel.com>,
<jmattson@...gle.com>, <daniel.sneddon@...ux.intel.com>,
<sandipan.das@....com>, <tony.luck@...el.com>,
<james.morse@....com>, <linux-doc@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <bagasdotme@...il.com>,
<eranian@...gle.com>
Subject: [PATCH v7 10/12] x86/resctrl: Add sysfs interface to write
mbm_local_bytes event configuration
The current event configuration can be changed by the user by writing
to the configuration file /sys/fs/resctrl/info/L3_MON/mbm_local_config.
The event configuration settings are domain specific and will affect all
the CPUs in the domain.
Following are the types of events supported:
==== ===========================================================
Bits Description
==== ===========================================================
6 Dirty Victims from the QOS domain to all types of memory
5 Reads to slow memory in the non-local NUMA domain
4 Reads to slow memory in the local NUMA domain
3 Non-temporal writes to non-local NUMA domain
2 Non-temporal writes to local NUMA domain
1 Reads to memory in the non-local NUMA domain
0 Reads to memory in the local NUMA domain
==== ===========================================================
For example:
To change the mbm_local_bytes to count all the non-temporal writes on
domain 0, the bits 2 and 3 needs to be set which is 1100b (in hex 0xc).
Run the command.
$echo 0=0xc > /sys/fs/resctrl/info/L3_MON/mbm_local_config
To change the mbm_local_bytes to count only reads to local NUMA domain 1,
the bit 0 needs to be set which 1b (in hex 0x1). Run the command.
$echo 1=0x1 > /sys/fs/resctrl/info/L3_MON/mbm_local_config
Signed-off-by: Babu Moger <babu.moger@....com>
---
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 25ff56ecb817..e744db5dc057 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1639,6 +1639,26 @@ static ssize_t mbm_total_config_write(struct kernfs_open_file *of,
return ret ?: nbytes;
}
+static ssize_t mbm_local_config_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes,
+ loff_t off)
+{
+ struct rdt_resource *r = of->kn->parent->priv;
+ int ret;
+
+ /* Valid input requires a trailing newline */
+ if (nbytes == 0 || buf[nbytes - 1] != '\n')
+ return -EINVAL;
+
+ rdt_last_cmd_clear();
+
+ buf[nbytes - 1] = '\0';
+
+ ret = mon_config_parse(r, buf, QOS_L3_MBM_LOCAL_EVENT_ID);
+
+ return ret ?: nbytes;
+}
+
/* rdtgroup information files for one cache resource. */
static struct rftype res_common_files[] = {
{
@@ -1749,6 +1769,7 @@ static struct rftype res_common_files[] = {
.mode = 0644,
.kf_ops = &rdtgroup_kf_single_ops,
.seq_show = mbm_local_config_show,
+ .write = mbm_local_config_write,
},
{
.name = "cpus",
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