linux-kernel - [PATCH v1 4/5] mm: zswap: remove same

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Message-ID: <20240405013547.1859126-5-yosryahmed@google.com>
Date: Fri,  5 Apr 2024 01:35:46 +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: [PATCH v1 4/5] mm: zswap: remove same_filled module params

These knobs offer more fine-grained control to userspace than needed and
directly expose/influence kernel implementation; remove them.

For disabling same_filled handling, there is no logical reason to refuse
storing same-filled pages more efficiently and opt for compression.
Scanning pages for patterns may be an argument, but the page contents
will be read into the CPU cache anyway during compression. Also,
removing the same_filled handling code does not move the needle
significantly in terms of performance anyway [1].

For disabling non_same_filled handling, it was added when the compressed
pages in zswap were not being properly charged to memcgs, as workloads
could escape the accounting with compression [2]. This is no longer the
case after commit f4840ccfca25 ("zswap: memcg accounting"), and using
zswap without compression does not make much sense.

[1]https://lore.kernel.org/lkml/CAJD7tkaySFP2hBQw4pnZHJJwe3bMdjJ1t9VC2VJd=khn1_TXvA@mail.gmail.com/
[2]https://lore.kernel.org/lkml/19d5cdee-2868-41bd-83d5-6da75d72e940@maciej.szmigiero.name/

Signed-off-by: Yosry Ahmed <yosryahmed@...gle.com>
---
 mm/zswap.c | 19 -------------------
 1 file changed, 19 deletions(-)

diff --git a/mm/zswap.c b/mm/zswap.c
index b92fa37bee277..a85c9235d19d3 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -123,19 +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,
-		   bool, 0644);
-
 /* Number of zpools in zswap_pool (empirically determined for scalability) */
 #define ZSWAP_NR_ZPOOLS 32
 
@@ -1368,9 +1355,6 @@ 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 = false;
 
-	if (!zswap_same_filled_pages_enabled)
-		return false;
-
 	page = kmap_local_folio(folio, 0);
 	val = page[0];
 
@@ -1460,9 +1444,6 @@ bool zswap_store(struct folio *folio)
 		goto store_entry;
 	}
 
-	if (!zswap_non_same_filled_pages_enabled)
-		goto freepage;
-
 	/* if entry is successfully added, it keeps the reference */
 	entry->pool = zswap_pool_current_get();
 	if (!entry->pool)
-- 
2.44.0.478.gd926399ef9-goog