[RFC PATCH v2 11/11] fs/resctrl: Document asymmetric L2 allocation options

[Tony Luck]

The rdt= kernel parameter accepts separate options for asymmetric L2 CAT and
CDP. On asymmetric systems, info/L2/cbm_mask represents the minimum cache
bitmask across domains.

Document the l2cat_asym and l2cdp_asym options and clarify the meaning of
cbm_mask.

Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
---
 Documentation/admin-guide/kernel-parameters.txt | 3 ++-
 Documentation/filesystems/resctrl.rst           | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 0b3c140babd9..a16f84bed8f9 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -6460,7 +6460,8 @@ Kernel parameters
 	rdt=		[HW,X86,RDT]
 			Turn on/off individual RDT features. List is:
 			cmt, mbmtotal, mbmlocal, l3cat, l3cdp, l2cat, l2cdp,
-			mba, smba, bmec, abmc, sdciae, energy[:guid],
+			l2cat_asym, l2cdp_asym, mba, smba, bmec, abmc, sdciae,
+			energy[:guid],
 			perf[:guid].
 			E.g. to turn on cmt and turn off mba use:
 				rdt=cmt,!mba
diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst
index 524ad062a6d9..241461e0612b 100644
--- a/Documentation/filesystems/resctrl.rst
+++ b/Documentation/filesystems/resctrl.rst
@@ -91,6 +91,9 @@ related to allocation:
 "cbm_mask":
 		The bitmask which is valid for this resource.
 		This mask is equivalent to 100%.
+		On systems that support asymmetric, per-domain,
+		cache allocation bitmasks this is the minimum
+		mask across all domains.
 "min_cbm_bits":
 		The minimum number of consecutive bits which
 		must be set when writing a mask.
-- 
2.56.0