From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7F24E377543 for ; Tue, 9 Jun 2026 17:57:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781027823; cv=none; b=KWlhfY2PpU7ZTOeKn3adwRrOzRLrXeAgeeDDfi4EBw1k1sVascf0J+/n1eFFMJkaXYn7HXQFqm4Xah4GvGFC5MMLWqiSQu/jlyyAan4NtBGtMxq27cyxDXIPrH0on6jyM83FdBjf4f32zaokjHDTwROsesY9XytVV4giV5dQDig= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781027823; c=relaxed/simple; bh=VJg6KH+3NSZXGMRXzXZy/BME/V47gRWCxMJyPQanBHw=; h=Date:To:From:Subject:Message-Id; b=PKSJoKJfEy5EvzRaKfPYhfg6yWhySUyY/HDDjZuFJbs9JGhuFNALgEbgv/rQJl6l9VrTtPfjXW9BFU+jJZ89kdUi/qjr3Jo0GRN6TFlR4KmhTy0zkBIeXm7t3cngtuLi5ec92CIBHFWIWaXCjhJDrC8O1HwJAgRrm0YZUoBwIAY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=Cm3LKR4e; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="Cm3LKR4e" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D0B281F00893; Tue, 9 Jun 2026 17:56:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1781027819; bh=UTh6FW0nBdGQLb4jRAYemioxbdNt9x7y2WmdGHCjji4=; h=Date:To:From:Subject; b=Cm3LKR4ewWuuisKj8EZu8kFkmg/w6S/F4EwBgKu1bP4HpJ/opRs2UA8pI1yb6uHtb BzpLBnWOZ0cixXINZ4CjpbMoeHd3eqqXV2VQ8o0I8OLmc3GDL+EuvqGE9XwZnWdmsD IwxCO4094HOW63PYGeTmc16zGTPt88/+G+9maMX0= Date: Tue, 09 Jun 2026 10:56:59 -0700 To: mm-commits@vger.kernel.org,shikemeng@huaweicloud.com,nphamcs@gmail.com,kasong@tencent.com,david@kernel.org,chrisl@kernel.org,baoquan.he@linux.dev,hch@lst.de,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-merge-writeout-into-pageout.patch added to mm-unstable branch Message-Id: <20260609175659.D0B281F00893@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm: merge writeout into pageout has been added to the -mm mm-unstable branch. Its filename is mm-merge-writeout-into-pageout.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-merge-writeout-into-pageout.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Christoph Hellwig Subject: mm: merge writeout into pageout Date: Mon, 1 Jun 2026 13:34:28 +0200 writeout is only called from pageout, and a straight flow at the end, so merge the two functions. Link: https://lore.kernel.org/20260601113449.3464734-3-hch@lst.de Signed-off-by: Christoph Hellwig Reviewed-by: Baoquan He Reviewed-by: Nhat Pham Acked-by: David Hildenbrand (Arm) Cc: Chris Li Cc: Kairui Song Cc: Kemeng Shi Signed-off-by: Andrew Morton --- mm/vmscan.c | 63 +++++++++++++++++++++++--------------------------- 1 file changed, 29 insertions(+), 34 deletions(-) --- a/mm/vmscan.c~mm-merge-writeout-into-pageout +++ a/mm/vmscan.c @@ -612,45 +612,14 @@ typedef enum { PAGE_CLEAN, } pageout_t; -static pageout_t writeout(struct folio *folio, struct address_space *mapping, - struct swap_iocb **plug, struct list_head *folio_list) -{ - int res; - - folio_set_reclaim(folio); - - /* - * The large shmem folio can be split if CONFIG_THP_SWAP is not enabled - * or we failed to allocate contiguous swap entries, in which case - * the split out folios get added back to folio_list. - */ - if (shmem_mapping(mapping)) - res = shmem_writeout(folio, plug, folio_list); - else - res = swap_writeout(folio, plug); - - if (res < 0) - handle_write_error(mapping, folio, res); - if (res == AOP_WRITEPAGE_ACTIVATE) { - folio_clear_reclaim(folio); - return PAGE_ACTIVATE; - } - - /* synchronous write? */ - if (!folio_test_writeback(folio)) - folio_clear_reclaim(folio); - - trace_mm_vmscan_write_folio(folio); - node_stat_add_folio(folio, NR_VMSCAN_WRITE); - return PAGE_SUCCESS; -} - /* * pageout is called by shrink_folio_list() for each dirty folio. */ static pageout_t pageout(struct folio *folio, struct address_space *mapping, struct swap_iocb **plug, struct list_head *folio_list) { + int res; + /* * We no longer attempt to writeback filesystem folios here, other * than tmpfs/shmem. That's taken care of in page-writeback. @@ -674,7 +643,33 @@ static pageout_t pageout(struct folio *f return PAGE_ACTIVATE; if (!folio_clear_dirty_for_io(folio)) return PAGE_CLEAN; - return writeout(folio, mapping, plug, folio_list); + + folio_set_reclaim(folio); + + /* + * The large shmem folio can be split if CONFIG_THP_SWAP is not enabled + * or we failed to allocate contiguous swap entries, in which case + * the split out folios get added back to folio_list. + */ + if (shmem_mapping(mapping)) + res = shmem_writeout(folio, plug, folio_list); + else + res = swap_writeout(folio, plug); + + if (res < 0) + handle_write_error(mapping, folio, res); + if (res == AOP_WRITEPAGE_ACTIVATE) { + folio_clear_reclaim(folio); + return PAGE_ACTIVATE; + } + + /* synchronous write? */ + if (!folio_test_writeback(folio)) + folio_clear_reclaim(folio); + + trace_mm_vmscan_write_folio(folio); + node_stat_add_folio(folio, NR_VMSCAN_WRITE); + return PAGE_SUCCESS; } /* _ Patches currently in -mm which might be from hch@lst.de are mm-merge-writeout-into-pageout.patch