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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> X-Rspamd-Queue-Id: BA74240006 X-Stat-Signature: 6ge3nzqgaxe15qsfm77kjhqodji77ojw X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1754022871-137750 X-HE-Meta: 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 7TERY3/C elRYfQY1r2R38jpyTrIOBYv4NxVNV1ZPB2OR7UHL1MVP2BdT6fLe35r/6+tMZib4u8IZ85mLMja5AwU1/yK7FylXncY4+eAqYJxmC/Q3M46TJAJtXrBcgaoYu9GAiSysTkq4THWXRYN+LMR7h+HZFkHzn7oPpgybMCW5eJcVu3+97vis= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.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