+ revert-mm-skip-cma-pages-when-they-are-not-available-update.patch added to mm-hotfixes-unstable branch

+ revert-mm-skip-cma-pages-when-they-are-not-available-update.patch added to mm-hotfixes-unstable branch

[Andrew Morton]

The patch titled
     Subject: revert-mm-skip-cma-pages-when-they-are-not-available-update
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     revert-mm-skip-cma-pages-when-they-are-not-available-update.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/revert-mm-skip-cma-pages-when-they-are-not-available-update.patch

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

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------------------------------------------------------
From: Usama Arif <usamaarif642@gmail.com>
Subject: revert-mm-skip-cma-pages-when-they-are-not-available-update
Date: Wed, 21 Aug 2024 20:26:07 +0100

also revert b7108d66318a ("Multi-gen LRU: skip CMA pages when they are not
eligible"), per Johannes

Link: https://lkml.kernel.org/r/9060a32d-b2d7-48c0-8626-1db535653c54@gmail.com
Link: https://lkml.kernel.org/r/357ac325-4c61-497a-92a3-bdbd230d5ec9@gmail.com
Fixes: 5da226dbfce3 ("mm: skip CMA pages when they are not available")
Signed-off-by: Usama Arif <usamaarif642@gmail.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Bharata B Rao <bharata@amd.com>
Cc: Breno Leitao <leitao@debian.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Zhaoyang Huang <huangzhaoyang@gmail.com>
Cc: Zhaoyang Huang <zhaoyang.huang@unisoc.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/vmscan.c |   21 +--------------------
 1 file changed, 1 insertion(+), 20 deletions(-)

--- a/mm/vmscan.c~revert-mm-skip-cma-pages-when-they-are-not-available-update
+++ a/mm/vmscan.c
@@ -4253,25 +4253,6 @@ void lru_gen_soft_reclaim(struct mem_cgr
 
 #endif /* CONFIG_MEMCG */
 
-#ifdef CONFIG_CMA
-/*
- * It is waste of effort to scan and reclaim CMA pages if it is not available
- * for current allocation context. Kswapd can not be enrolled as it can not
- * distinguish this scenario by using sc->gfp_mask = GFP_KERNEL
- */
-static bool skip_cma(struct folio *folio, struct scan_control *sc)
-{
-	return !current_is_kswapd() &&
-			gfp_migratetype(sc->gfp_mask) != MIGRATE_MOVABLE &&
-			folio_migratetype(folio) == MIGRATE_CMA;
-}
-#else
-static bool skip_cma(struct folio *folio, struct scan_control *sc)
-{
-	return false;
-}
-#endif
-
 /******************************************************************************
  *                          the eviction
  ******************************************************************************/
@@ -4319,7 +4300,7 @@ static bool sort_folio(struct lruvec *lr
 	}
 
 	/* ineligible */
-	if (zone > sc->reclaim_idx || skip_cma(folio, sc)) {
+	if (zone > sc->reclaim_idx) {
 		gen = folio_inc_gen(lruvec, folio, false);
 		list_move_tail(&folio->lru, &lrugen->folios[gen][type][zone]);
 		return true;
_

Patches currently in -mm which might be from usamaarif642@gmail.com are

revert-mm-skip-cma-pages-when-they-are-not-available.patch
revert-mm-skip-cma-pages-when-they-are-not-available-update.patch