From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793553399; b=VgUbaVytDZdzl+JvdhO8cgpfPGHc2xdDXWvbemIXv1SyAI/1MnDclTe7WNb0mw1Q34uk lOhkT00Yx1t+QkzO/CKGdG9ywPk5J+fRA4Bq81jWafyVjkE4h7Zp3afRibDq3/pNEhopl o7ZRKVMDkxyJAG95BuX+rv8Aqh2eXzDyxjscvFjMpPc+NY1jsTdxIosAO/GAse2Sh+OuB UUiaGFAcrMpUhDUoO3OJmeEzuNtjGoPXS2ZCWM7nmGFBF83iq2sDc7I8SaMIHIgBr5r6+ fhZ27uyiuG3DdacH1hjlC2SmqUY0Z4PO6kn2hst6C5TB+YWa3cf05MRBpV8tkVImb0w== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793553399; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=LWF8HqqZQM/4p+lXqb/vLTu7jnbhepuFV5KLr5c8wVs=; b=k6CFN3QE8EVizW81jhde62tWuU8KfRZWS04yVQKuLjjXcHp2BEqsAhmwuXHy/ukrQuOD 75M8isAGSDy8hkGFYFBmVA42e0BbXoNEtJIHCkMjbP9CZKnwDXzYclhPCr6AwRrQWFgAT RKNAQcbtqLPhZmfEKyTrBSFQLnsH0H1UdjHcQoeCR5Hhhu6fBZBjfsLFU/MdE49HCOdr4 SWNXw0Dlh/B8DqDF+J80CG0eFFn5R7uhsNQheZ1m6ryb+LPm4E97Pqaa9PNUjzCjMmvLZ +OlnUJJCEkrXLu0kzU4DkowE0BSjLbnH74U8Ip5qDii7+4J33tYH+208WAUleMHXkOA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b="mRVe0/+Y"; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 61A10606A331; Sun, 1 Nov 2026 17:16:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=mRVe0/+Y Received: by smtp.kernel.org (Postfix) with ESMTPSA id BF1F31F00A1B; Sun, 1 Nov 2026 17:16:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793553398; bh=LWF8HqqZQM/4p+lXqb/vLTu7jnbhepuFV5KLr5c8wVs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=mRVe0/+Ybe+Q344Ia1uQmRR0/nFDfHWg4/WCy0yK8y1JLvVyKdE9xKBbujg1iaJ3C iBUYVPzMOB5Qg7xQaJv1rhZg4S5mDd4nnH0Jp8nCAMXXxDJvDwLtvw4UwRMEgHzH2J Qt3HwC0z+xp/aVswXTUMNtSZeLUI+m64ng6tDUZmW6b144L/pj1+QevI3kG9vU72a8 L11M8hYyPZtosI6CoTbMjfL/+TyROFcK8MPkWWnC1loerqsQ1M9EmevY0EaJAImabo toOn3myIwZcenoxqk6DGfXzCkrKGMp7hvC7t4meDpg5JnoGza4nU5OSGtajzKqTKog U+q8HgF8QA3Pg== From: SJ Park To: Cc: SJ Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v2 2/6] mm/damon/vaddr: use damos->last_applied for migrate action Date: Sun, 1 Nov 2026 09:16:25 -0800 Message-ID: <20261101171630.81477-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20261101171630.81477-1-sj@kernel.org> References: <20261101171630.81477-1-sj@kernel.org> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit To avoid applying the same DAMOS action multiple times to folios that are located across adjacent regions, damos->last_applied was introduced. DAMOS_MIGRATE_{HOT,COLD} action support in vaddr is not utilizing it. Use it to avoid unnecessarily applying the same action to the same folio multiple times. Signed-off-by: SJ Park --- mm/damon/vaddr.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c index c271b6d63c027..b1d7bcf7305bb 100644 --- a/mm/damon/vaddr.c +++ b/mm/damon/vaddr.c @@ -834,6 +834,12 @@ static void damos_va_migrate_dests_add(struct folio *folio, list_add(&folio->lru, &migration_lists[i]); } +static inline bool damos_va_invalid_folio(struct folio *folio, + struct damos *s) +{ + return !folio || folio == s->last_applied; +} + static int damos_va_migrate_pmd_entry(pmd_t *pmd, unsigned long addr, unsigned long next, struct mm_walk *walk) { @@ -854,10 +860,11 @@ static int damos_va_migrate_pmd_entry(pmd_t *pmd, unsigned long addr, if (!pmd_present(pmde)) goto huge_out; folio = vm_normal_folio_pmd(walk->vma, addr, pmde); - if (!folio) + if (damos_va_invalid_folio(folio, s)) goto huge_out; if (damos_va_filter_out(s, folio, walk->vma, addr, NULL, pmd)) goto huge_out; + s->last_applied = folio; damos_va_migrate_dests_add(folio, walk->vma, addr, dests, migration_lists); huge_out: @@ -879,12 +886,13 @@ static int damos_va_migrate_pmd_entry(pmd_t *pmd, unsigned long addr, if (pte_none(ptent) || !pte_present(ptent)) continue; folio = vm_normal_folio(walk->vma, addr, ptent); - if (!folio) + if (damos_va_invalid_folio(folio, s)) continue; page_idx = folio_page_idx(folio, pte_page(ptent)); nr = folio_nr_pages(folio) - page_idx; if (damos_va_filter_out(s, folio, walk->vma, addr, pte, NULL)) continue; + s->last_applied = folio; damos_va_migrate_dests_add(folio, walk->vma, addr, dests, migration_lists); } @@ -991,12 +999,6 @@ struct damos_va_stat_private { unsigned long *sz_filter_passed; }; -static inline bool damos_va_invalid_folio(struct folio *folio, - struct damos *s) -{ - return !folio || folio == s->last_applied; -} - static int damos_va_stat_pmd_entry(pmd_t *pmd, unsigned long addr, unsigned long next, struct mm_walk *walk) { -- 2.47.3