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| author | Ingo Molnar <mingo@kernel.org> | 2026-05-29 09:51:05 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2026-05-29 09:51:06 +0200 |
| commit | bdcde1764874073dbb728313f80ec4c05b371247 (patch) | |
| tree | dab7f1d3fd339118c5ce86063ce51b037e73031e /Documentation | |
| parent | ca392db855e9a95a0ed48167ae2da289bdeb74a0 (diff) | |
| parent | 1cfa74c683ea82d37156ccd7ab4f4659056dc701 (diff) | |
| download | linux-next-history-bdcde1764874073dbb728313f80ec4c05b371247.tar.gz | |
Merge branch into tip/master: 'x86/cache'
# New commits in x86/cache:
1cfa74c683ea ("fs/resctrl: Document tasks file behaviour for task id 0 and idle tasks")
9a1646211f8c ("fs/resctrl: Document that automatic counter assignment is best effort")
3aec86e4ea01 ("fs/resctrl: Continue counter allocation after failure")
ee3d4c81d89c ("fs/resctrl: Add monitor property 'mbm_cntr_assign_fixed'")
f52abe650241 ("fs/resctrl: Disallow the software controller when MBM counters are assignable")
94a1206522d1 ("x86,fs/resctrl: Create 'event_filter' files read only if they're not configurable")
7625632fed43 ("fs/resctrl: Tidy up the error path in resctrl_mkdir_event_configs()")
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/filesystems/resctrl.rst | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst index b003bed339fdd..e4b66af55ffba 100644 --- a/Documentation/filesystems/resctrl.rst +++ b/Documentation/filesystems/resctrl.rst @@ -427,9 +427,9 @@ with the following files: Two MBM events are supported by default: mbm_local_bytes and mbm_total_bytes. Each MBM event's sub-directory contains a file named "event_filter" that is - used to view and modify which memory transactions the MBM event is configured - with. The file is accessible only when "mbm_event" counter assignment mode is - enabled. + used to view and (if writable) modify which memory transactions the MBM event + is configured with. The file is accessible only when "mbm_event" counter + assignment mode is enabled. List of memory transaction types supported: @@ -454,9 +454,8 @@ with the following files: # cat /sys/fs/resctrl/info/L3_MON/event_configs/mbm_local_bytes/event_filter local_reads,local_non_temporal_writes,local_reads_slow_memory - Modify the event configuration by writing to the "event_filter" file within - the "event_configs" directory. The read/write "event_filter" file contains the - configuration of the event that reflects which memory transactions are counted by it. + The memory transactions the MBM event is configured with can be changed + if "event_filter" is writable. For example:: @@ -480,6 +479,12 @@ with the following files: "1": Auto assignment is enabled. + Automatic counter assignment is done with best effort. If auto + assignment is enabled but there are not enough available counters then + monitor group creation could succeed while one or more events belonging + to the group may not have a counter assigned in all domains. Consult + mbm_L3_assignments for counter assignment states of the new groups. + Example:: # echo 0 > /sys/fs/resctrl/info/L3_MON/mbm_assign_on_mkdir @@ -570,6 +575,11 @@ All groups contain the following files: then the task must already belong to the CTRL_MON parent of this group. The task is removed from any previous MON group. + When writing to this file, a task id of 0 is interpreted as the + task id of the currently running task. On reading the file, a task + id of 0 will never be shown and there is no representation of the + idle tasks. Instead, a CPU's idle task is always considered as a + member of the group owning the CPU. "cpus": Reading this file shows a bitmask of the logical CPUs owned by |