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(p200300d82f2849002c244e201f219fbd.dip0.t-ipconnect.de. [2003:d8:2f28:4900:2c24:4e20:1f21:9fbd]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b5e8dc1de0sm15098577f8f.24.2025.07.15.07.18.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 15 Jul 2025 07:18:27 -0700 (PDT) Message-ID: <3336b153-7600-4b1a-9acc-0ecde8d32cdc@redhat.com> Date: Tue, 15 Jul 2025 16:18:26 +0200 Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/5] huge_memory: add huge_zero_page_shrinker_(init|exit) function 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 , 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, hch@lst.de, Pankaj Raghav References: <20250707142319.319642-1-kernel@pankajraghav.com> <20250707142319.319642-3-kernel@pankajraghav.com> From: David Hildenbrand Content-Language: en-US Organization: Red Hat In-Reply-To: <20250707142319.319642-3-kernel@pankajraghav.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 07.07.25 16:23, Pankaj Raghav (Samsung) wrote: > From: Pankaj Raghav > > Add huge_zero_page_shrinker_init() and huge_zero_page_shrinker_exit(). > As shrinker will not be needed when static PMD zero page is enabled, > these two functions can be a no-op. > > This is a preparation patch for static PMD zero page. No functional > changes. > > Signed-off-by: Pankaj Raghav > --- > mm/huge_memory.c | 38 +++++++++++++++++++++++++++----------- > 1 file changed, 27 insertions(+), 11 deletions(-) > > diff --git a/mm/huge_memory.c b/mm/huge_memory.c > index d3e66136e41a..101b67ab2eb6 100644 > --- a/mm/huge_memory.c > +++ b/mm/huge_memory.c > @@ -289,6 +289,24 @@ static unsigned long shrink_huge_zero_page_scan(struct shrinker *shrink, > } > > static struct shrinker *huge_zero_page_shrinker; > +static int huge_zero_page_shrinker_init(void) > +{ > + huge_zero_page_shrinker = shrinker_alloc(0, "thp-zero"); > + if (!huge_zero_page_shrinker) > + return -ENOMEM; > + > + huge_zero_page_shrinker->count_objects = shrink_huge_zero_page_count; > + huge_zero_page_shrinker->scan_objects = shrink_huge_zero_page_scan; > + shrinker_register(huge_zero_page_shrinker); > + return 0; > +} > + > +static void huge_zero_page_shrinker_exit(void) > +{ > + shrinker_free(huge_zero_page_shrinker); > + return; > +} While at it, we should rename most of that to "huge_zero_folio" I assume. -- Cheers, David / dhildenb