patches/old/mm-zswap-remove-same_filled-module-params-fix.patch

From: Yosry Ahmed <yosryahmed@google.com>
Subject: mm: zswap: remove same_filled_pages from docs
Date: Sun, 14 Apr 2024 21:03:43 +0000

The module parameters are now removed, remove all references from kernel
docs.

Link: https://lkml.kernel.org/r/ZhxFVggdyvCo79jc@google.com
Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
Cc: Chengming Zhou <chengming.zhou@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: "Maciej S. Szmigiero" <mail@maciej.szmigiero.name>
Cc: Nhat Pham <nphamcs@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 Documentation/admin-guide/mm/zswap.rst             |   29 -----------
 Documentation/driver-api/crypto/iaa/iaa-crypto.rst |    2 
 2 files changed, 31 deletions(-)

--- a/Documentation/admin-guide/mm/zswap.rst~mm-zswap-remove-same_filled-module-params-fix
+++ a/Documentation/admin-guide/mm/zswap.rst
@@ -111,35 +111,6 @@ checked if it is a same-value filled pag
 compressed length of the page is set to zero and the pattern or same-filled
 value is stored.
 
-Same-value filled pages identification feature is enabled by default and can be
-disabled at boot time by setting the ``same_filled_pages_enabled`` attribute
-to 0, e.g. ``zswap.same_filled_pages_enabled=0``. It can also be enabled and
-disabled at runtime using the sysfs ``same_filled_pages_enabled``
-attribute, e.g.::
-
-	echo 1 > /sys/module/zswap/parameters/same_filled_pages_enabled
-
-When zswap same-filled page identification is disabled at runtime, it will stop
-checking for the same-value filled pages during store operation.
-In other words, every page will be then considered non-same-value filled.
-However, the existing pages which are marked as same-value filled pages remain
-stored unchanged in zswap until they are either loaded or invalidated.
-
-In some circumstances it might be advantageous to make use of just the zswap
-ability to efficiently store same-filled pages without enabling the whole
-compressed page storage.
-In this case the handling of non-same-value pages by zswap (enabled by default)
-can be disabled by setting the ``non_same_filled_pages_enabled`` attribute
-to 0, e.g. ``zswap.non_same_filled_pages_enabled=0``.
-It can also be enabled and disabled at runtime using the sysfs
-``non_same_filled_pages_enabled`` attribute, e.g.::
-
-	echo 1 > /sys/module/zswap/parameters/non_same_filled_pages_enabled
-
-Disabling both ``zswap.same_filled_pages_enabled`` and
-``zswap.non_same_filled_pages_enabled`` effectively disables accepting any new
-pages by zswap.
-
 To prevent zswap from shrinking pool when zswap is full and there's a high
 pressure on swap (this will result in flipping pages in and out zswap pool
 without any real benefit but with a performance drop for the system), a
--- a/Documentation/driver-api/crypto/iaa/iaa-crypto.rst~mm-zswap-remove-same_filled-module-params-fix
+++ a/Documentation/driver-api/crypto/iaa/iaa-crypto.rst
@@ -457,7 +457,6 @@ Use the following commands to enable zsw
   # echo deflate-iaa > /sys/module/zswap/parameters/compressor
   # echo zsmalloc > /sys/module/zswap/parameters/zpool
   # echo 1 > /sys/module/zswap/parameters/enabled
-  # echo 0 > /sys/module/zswap/parameters/same_filled_pages_enabled
   # echo 100 > /proc/sys/vm/swappiness
   # echo never > /sys/kernel/mm/transparent_hugepage/enabled
   # echo 1 > /proc/sys/vm/overcommit_memory
@@ -599,7 +598,6 @@ the 'fixed' compression mode::
   echo deflate-iaa > /sys/module/zswap/parameters/compressor
   echo zsmalloc > /sys/module/zswap/parameters/zpool
   echo 1 > /sys/module/zswap/parameters/enabled
-  echo 0 > /sys/module/zswap/parameters/same_filled_pages_enabled
 
   echo 100 > /proc/sys/vm/swappiness
   echo never > /sys/kernel/mm/transparent_hugepage/enabled
_