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| author | Aaron Tomlin <atomlin@atomlin.com> | 2026-03-24 20:11:59 -0400 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2026-04-02 00:22:59 +0200 |
| commit | d2bf45d067c728b0fe6e8f99a7386b8291e391e3 (patch) | |
| tree | 221f360208029c808f8857a5bfd42adb3976a436 /Documentation/filesystems/resctrl.rst | |
| parent | d06b8e7c97c3290e61006e30b32beb9e715fab82 (diff) | |
| download | linux-next-d2bf45d067c728b0fe6e8f99a7386b8291e391e3.tar.gz linux-next-d2bf45d067c728b0fe6e8f99a7386b8291e391e3.zip | |
fs/resctrl: Add "*" shorthand to set io_alloc CBM for all domains
Configuring the io_alloc_cbm interface requires an explicit domain ID for each
cache domain. On systems with high core counts and numerous cache clusters,
this requirement becomes cumbersome for automation and management tasks that
aim to apply a uniform policy.
Introduce a wildcard domain ID selector "*" for the io_alloc_cbm interface.
This enables users to set the same Capacity Bitmask (CBM) across all cache
domains in a single operation.
Signed-off-by: Aaron Tomlin <atomlin@atomlin.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://patch.msgid.link/20260325001159.447075-3-atomlin@atomlin.com
Diffstat (limited to 'Documentation/filesystems/resctrl.rst')
| -rw-r--r-- | Documentation/filesystems/resctrl.rst | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst index ba609f8d4de5..b003bed339fd 100644 --- a/Documentation/filesystems/resctrl.rst +++ b/Documentation/filesystems/resctrl.rst @@ -215,6 +215,14 @@ related to allocation: # cat /sys/fs/resctrl/info/L3/io_alloc_cbm 0=00ff;1=000f + An ID of "*" configures all domains with the provided CBM. + + Example on a system that does not require a minimum number of consecutive bits in the mask:: + + # echo "*=0" > /sys/fs/resctrl/info/L3/io_alloc_cbm + # cat /sys/fs/resctrl/info/L3/io_alloc_cbm + 0=0;1=0 + When CDP is enabled "io_alloc_cbm" associated with the CDP_DATA and CDP_CODE resources may reflect the same values. For example, values read from and written to /sys/fs/resctrl/info/L3DATA/io_alloc_cbm may be reflected by |