+ mm-zswap-improve-with-alloc_workqueue-call.patch added to mm-unstable branch

+ mm-zswap-improve-with-alloc_workqueue-call.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/zswap: improve with alloc_workqueue() call
has been added to the -mm mm-unstable branch.  Its filename is
     mm-zswap-improve-with-alloc_workqueue-call.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-zswap-improve-with-alloc_workqueue-call.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Ronald Monthero <debug.penguin32@gmail.com>
Subject: mm/zswap: improve with alloc_workqueue() call
Date: Tue, 16 Jan 2024 23:31:45 +1000

The core-api create_workqueue is deprecated, this patch replaces the
create_workqueue with alloc_workqueue.  The previous implementation
workqueue of zswap was a bounded workqueue, this patch uses
alloc_workqueue() to create an unbounded workqueue.  The WQ_UNBOUND
attribute is desirable making the workqueue not localized to a specific
cpu so that the scheduler is free to exercise improvisations in any
demanding scenarios for offloading cpu time slices for workqueues.  For
example if any other workqueues of the same primary cpu had to be served
which are WQ_HIGHPRI and WQ_CPU_INTENSIVE.  Also Unbound workqueue happens
to be more efficient in a system during memory pressure scenarios in
comparison to a bounded workqueue.

shrink_wq = alloc_workqueue("zswap-shrink",
                     WQ_UNBOUND|WQ_MEM_RECLAIM, 1);

Overall the change suggested in this patch should be seamless and does not
alter the existing behavior, other than the improvisation to be an
unbounded workqueue.

Link: https://lkml.kernel.org/r/20240116133145.12454-1-debug.penguin32@gmail.com
Signed-off-by: Ronald Monthero <debug.penguin32@gmail.com>
Cc: Chris Li <chrisl@kernel.org>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/zswap.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/mm/zswap.c~mm-zswap-improve-with-alloc_workqueue-call
+++ a/mm/zswap.c
@@ -1884,7 +1884,8 @@ static int zswap_setup(void)
 		zswap_enabled = false;
 	}
 
-	shrink_wq = create_workqueue("zswap-shrink");
+	shrink_wq = alloc_workqueue("zswap-shrink",
+			WQ_UNBOUND|WQ_MEM_RECLAIM, 1);
 	if (!shrink_wq)
 		goto fallback_fail;
 
_

Patches currently in -mm which might be from debug.penguin32@gmail.com are

mm-zswap-improve-with-alloc_workqueue-call.patch