From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f175.google.com (mail-pg1-f175.google.com [209.85.215.175]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3F6F926ACB; Fri, 1 Aug 2025 04:34:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.175 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754022872; cv=none; b=huQ4uHfwMHSt4dwbIx5hHZGZKeSKmPkFrL+jS9ogLBaxQG4bwXwquaJOlkvRLKil+TnlVk7Fbqf63V0E/ISQOtt46OHMCm7+/U/pXrvmrhOTyVPSbVcnPlvRm2VTiDQ3v+kqIkfpF/RC0FSKtFqxV4EF5796Oxv+6GaBWATCMzI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754022872; c=relaxed/simple; bh=g54viIUtOxVSs1aexxwT6KRtQkgjFfpt8K6GqFRJV3E=; h=From:To:Cc:Subject:In-Reply-To:Date:Message-ID:References; b=WX0Z2f789JF0PVugr0C0gYe9gn8OKCh5U0iJvRkgXrGM5nG1tqkpTZJXhQ2PonEwgVMPSzDYdboNBL3YrIddZBkNFy5g5+GxsSe4Fou0ugifsZxUFemL3D1vEUBuPsz/q8OyXdEouojYaFMG0owsr7J8hDFcUgOt0eJJgMP/rhY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=fpKwrCgj; arc=none smtp.client-ip=209.85.215.175 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="fpKwrCgj" Received: by mail-pg1-f175.google.com with SMTP id 41be03b00d2f7-b26f7d2c1f1so1258211a12.0; Thu, 31 Jul 2025 21:34:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1754022870; x=1754627670; darn=vger.kernel.org; h=references:message-id:date:in-reply-to:subject:cc:to:from:from:to :cc:subject:date:message-id:reply-to; bh=Hvy1+S1s4fKJdVyggMwF0uoMUuYMvpNuWclsNDW3SSw=; b=fpKwrCgjIl7+1FBNiFMScmYuQwACei0wX52ynPHnTUc45XWMsNZoDvvVI6sc+5eSfL VVwu+nE1Fe0bA4eatyOvLVXtgP4MeusfZrK1nJGR4OIdptSPgm4bkWYSQcDtXF4+yEZ/ SCcBkqNeN3iKURKDHRCB/MNwRMpHwcU0DQ8Rv74UnCbqPNvfWEhIEp7J6LNY5H/bziLV BVptHU9qvVHPU4WVKSE0yug/I7jWYYFp+LQg0z0+NC39E3CFwZ1IIXu/ZSXjjNxi/BCD S7w1eO08TA+0GKJ/uWXLXWqFbzzoYAI1DmdMGxbZSAr7a+glFvBj4fhfdlyywOsVlG+D f4Jw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754022870; x=1754627670; h=references:message-id:date:in-reply-to:subject:cc:to:from :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=Hvy1+S1s4fKJdVyggMwF0uoMUuYMvpNuWclsNDW3SSw=; b=vcm2vt8MCSsGixajlZkOWbZOXvKVphGIsBk5T7EG8827ydMPRGBHb4X/TB8w9vAvjY y/f5qnlU/9ZFesul97gRe3QbzkkfYoUmtsVf7Ue5fSKwZ3usm0a2zJiBxxeWuVGR6AfR DO84/PQ7pTSaGnDSxldY4+daykhBakA/ozNCMwMucZ8ramXBj7y1SQJ/EJfBL8KpQqLT pqSRLoBkVdOmxidWAjhfD3ZY/gzZafMNW6ASQdZNeozE21eAmvl+Bfc+UQX+mzRcOsty 9NOdo+eE7n1cJNNLPBmAsOPPOkVGUgxiXLlprbqYfuY3GbDESKIKGa+8afcGJrJToX4K Fqvw== X-Forwarded-Encrypted: i=1; AJvYcCUh1zM5ZWVDLuzM3vG3rDeT3NCtx12b84cG2W0f5VTx7llRCgVyHAKjvDUIABC6Uzw2IGXs5tY1F/1wGg==@vger.kernel.org, AJvYcCXAM+LsqhK9KbePRbdAEi/xTPxv6KPzN/7Qe3bky+P3TiDrIVswKhh91XUXpju5iD5tHfdv1IkMcQo7mSRkXA==@vger.kernel.org X-Gm-Message-State: AOJu0YzfkLF7uj1pD5ituBnGgDyze1ET3teT7JI4wI1sYOZRkXipR7JO CfrdwdzDRYAWCflvNsUotC/7KqRckwIye+ydENNxoO8aJdqteYRWa0o0 X-Gm-Gg: ASbGncsiOlhQeisXlTWeKHh7IS/4B3bqi+0GI77U/oFljGj2mET6JCuLuAO0AIbq57B JdidF4Muy1CfZ/HW+rwPJvORJmNZBqfKhT3BGXKh/QB1oY+2aL9NBjlKW/W8E7Jek1qoMooGVc1 FMA5QC5gCZglvHCJ4w3W9HsnhFCQpZlK4J5+706X7GOoYkEGFal76Ao4mWwHM+w8Yq1M3LhGkyP Lonw1RkB11tOZCf6KWm5F5NO7Gl8T09ikMX3j+JAav83xNaghq47bk8P3GZz29TrCvHS7KnYeKx 4xxYBCPJtm+C7sk7LazTGNWn0MOzlTiVBeYXGXA6cKcfsSIT6EHxdrzqncv3htG6ShEaPzLH77i EC01QeRSMKivIigo= X-Google-Smtp-Source: AGHT+IH3hwA2OpRbr/zHoWNUCy0aIL06wDEuaRMcP/tc6VQhVRBB71zAOlOqZeisNVx6p6jZ1hMqIA== X-Received: by 2002:a17:902:ea12:b0:240:a8c8:5f6f with SMTP id d9443c01a7336-2422a6a7c11mr18344715ad.27.1754022870462; Thu, 31 Jul 2025 21:34:30 -0700 (PDT) Received: from dw-tp ([49.205.218.89]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-241d1f0e7d8sm31815305ad.42.2025.07.31.21.34.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 31 Jul 2025 21:34:29 -0700 (PDT) From: Ritesh Harjani (IBM) To: "Pankaj Raghav (Samsung)" , Suren Baghdasaryan , Ryan Roberts , Baolin Wang , Borislav Petkov , Ingo Molnar , "H . Peter Anvin" , Vlastimil Babka , Zi Yan , Mike Rapoport , Dave Hansen , Michal Hocko , David Hildenbrand , Lorenzo Stoakes , Andrew Morton , Thomas Gleixner , Nico Pache , Dev Jain , "Liam R . Howlett" , Jens Axboe Cc: linux-kernel@vger.kernel.org, willy@infradead.org, linux-mm@kvack.org, x86@kernel.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, "Darrick J . Wong" , mcgrof@kernel.org, gost.dev@samsung.com, kernel@pankajraghav.com, hch@lst.de, Pankaj Raghav Subject: Re: [RFC v2 3/4] mm: add largest_zero_folio() routine In-Reply-To: <20250724145001.487878-4-kernel@pankajraghav.com> Date: Fri, 01 Aug 2025 10:00:27 +0530 Message-ID: <87seibr7do.fsf@gmail.com> References: <20250724145001.487878-1-kernel@pankajraghav.com> <20250724145001.487878-4-kernel@pankajraghav.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: "Pankaj Raghav (Samsung)" writes: > From: Pankaj Raghav > > Add largest_zero_folio() routine so that huge_zero_folio can be [largest]_zero_folio() can sound a bit confusing with largest in it's name. Maybe optimal_zero_folio()? No hard opinion though. Will leave it upto you. -ritesh > used directly when CONFIG_STATIC_HUGE_ZERO_FOLIO is enabled. This will > return ZERO_PAGE folio if CONFIG_STATIC_HUGE_ZERO_FOLIO is disabled or > if we failed to allocate a huge_zero_folio. > > Co-developed-by: David Hildenbrand > Signed-off-by: David Hildenbrand > Signed-off-by: Pankaj Raghav > --- > include/linux/huge_mm.h | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > > diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h > index 78ebceb61d0e..c44a6736704b 100644 > --- a/include/linux/huge_mm.h > +++ b/include/linux/huge_mm.h > @@ -716,4 +716,21 @@ static inline int split_folio_to_order(struct folio *folio, int new_order) > return split_folio_to_list_to_order(folio, NULL, new_order); > } > > +/* > + * largest_zero_folio - Get the largest zero size folio available > + * > + * This function will return huge_zero_folio if CONFIG_STATIC_HUGE_ZERO_FOLIO > + * is enabled. Otherwise, a ZERO_PAGE folio is returned. > + * > + * Deduce the size of the folio with folio_size instead of assuming the > + * folio size. > + */ > +static inline struct folio *largest_zero_folio(void) > +{ > + struct folio *folio = get_static_huge_zero_folio(); > + > + if (folio) > + return folio; > + return page_folio(ZERO_PAGE(0)); > +} > #endif /* _LINUX_HUGE_MM_H */ > -- > 2.49.0