[merged] mm-update-shuffle-documentation-to-match-its-current-state.patch removed from -mm tree

[merged] mm-update-shuffle-documentation-to-match-its-current-state.patch removed from -mm tree

[Andrew Morton]

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The quilt patch titled
     Subject: mm: Update shuffle documentation to match its current state
has been removed from the -mm tree.  Its filename was
     mm-update-shuffle-documentation-to-match-its-current-state.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: Maíra Canal <mcanal@igalia.com>
Subject: mm: Update shuffle documentation to match its current state
Date: Mon, 22 Apr 2024 11:18:40 -0300

Commit 839195352d82 ("mm/shuffle: remove dynamic reconfiguration") removed
the dynamic reconfiguration capabilities from the shuffle page allocator. 
This means that, now, we don't have any perspective of an "autodetection
of memory-side-cache" that triggers the enablement of the shuffle page
allocator.

Therefore, let the documentation reflect that the only way to enable
the shuffle page allocator is by setting `page_alloc.shuffle=1`.

Link: https://lkml.kernel.org/r/20240422142007.1062231-1-mcanal@igalia.com
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 Documentation/admin-guide/kernel-parameters.txt |   10 ++++------
 mm/Kconfig                                      |    7 +++----
 2 files changed, 7 insertions(+), 10 deletions(-)

--- a/Documentation/admin-guide/kernel-parameters.txt~mm-update-shuffle-documentation-to-match-its-current-state
+++ a/Documentation/admin-guide/kernel-parameters.txt
@@ -4176,13 +4176,11 @@
 
 	page_alloc.shuffle=
 			[KNL] Boolean flag to control whether the page allocator
-			should randomize its free lists. The randomization may
-			be automatically enabled if the kernel detects it is
-			running on a platform with a direct-mapped memory-side
-			cache, and this parameter can be used to
-			override/disable that behavior. The state of the flag
-			can be read from sysfs at:
+			should randomize its free lists. This parameter can be
+			used to enable/disable page randomization. The state of
+			the flag can be read from sysfs at:
 			/sys/module/page_alloc/parameters/shuffle.
+			This parameter is only available if CONFIG_SHUFFLE_PAGE_ALLOCATOR=y.
 
 	page_owner=	[KNL,EARLY] Boot-time page_owner enabling option.
 			Storage of the information about who allocated
--- a/mm/Kconfig~mm-update-shuffle-documentation-to-match-its-current-state
+++ a/mm/Kconfig
@@ -333,10 +333,9 @@ config SHUFFLE_PAGE_ALLOCATOR
 
 	  While the randomization improves cache utilization it may
 	  negatively impact workloads on platforms without a cache. For
-	  this reason, by default, the randomization is enabled only
-	  after runtime detection of a direct-mapped memory-side-cache.
-	  Otherwise, the randomization may be force enabled with the
-	  'page_alloc.shuffle' kernel command line parameter.
+	  this reason, by default, the randomization is not enabled even
+	  if SHUFFLE_PAGE_ALLOCATOR=y. The randomization may be force enabled
+	  with the 'page_alloc.shuffle' kernel command line parameter.
 
 	  Say Y if unsure.
 
_

Patches currently in -mm which might be from mcanal@igalia.com are