linux-kernel - [RFC PATCH 5/9] mm: zswap: remove zswap_same_filled_pages

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240325235018.2028408-6-yosryahmed@google.com>
Date: Mon, 25 Mar 2024 23:50:13 +0000
From: Yosry Ahmed <yosryahmed@...gle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Johannes Weiner <hannes@...xchg.org>, Nhat Pham <nphamcs@...il.com>, 
	Chengming Zhou <chengming.zhou@...ux.dev>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	Yosry Ahmed <yosryahmed@...gle.com>
Subject: [RFC PATCH 5/9] mm: zswap: remove zswap_same_filled_pages_enabled

There is no logical reason to refuse storing same-filled pages more
efficiently and opt for compression. Remove the userspace knob.

Signed-off-by: Yosry Ahmed <yosryahmed@...gle.com>
---
 mm/zswap.c | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/mm/zswap.c b/mm/zswap.c
index 498a6c5839bef..0fc27ae950c74 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -123,14 +123,6 @@ static unsigned int zswap_accept_thr_percent = 90; /* of max pool size */
 module_param_named(accept_threshold_percent, zswap_accept_thr_percent,
 		   uint, 0644);
 
-/*
- * Enable/disable handling same-value filled pages (enabled by default).
- * If disabled every page is considered non-same-value filled.
- */
-static bool zswap_same_filled_pages_enabled = true;
-module_param_named(same_filled_pages_enabled, zswap_same_filled_pages_enabled,
-		   bool, 0644);
-
 /* Enable/disable handling non-same-value filled pages (enabled by default) */
 static bool zswap_non_same_filled_pages_enabled = true;
 module_param_named(non_same_filled_pages_enabled, zswap_non_same_filled_pages_enabled,
@@ -1392,9 +1384,6 @@ static bool zswap_is_folio_same_filled(struct folio *folio, unsigned long *value
 	unsigned int pos, last_pos = PAGE_SIZE / sizeof(*page) - 1;
 	bool ret;
 
-	if (!zswap_same_filled_pages_enabled)
-		return false;
-
 	page = kmap_local_folio(folio, 0);
 	val = page[0];
 
-- 
2.44.0.396.g6e790dbe36-goog