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[67.174.241.145]) by smtp.gmail.com with ESMTPSA id w2-20020a62c702000000b006d9a0059a9asm2173490pfg.172.2024.01.09.11.31.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Jan 2024 11:31:54 -0800 (PST) From: Yang Shi To: oliver.sang@intel.com, riel@surriel.com, fengwei.yin@intel.com, willy@infradead.org, cl@linux.com, ying.huang@intel.com, akpm@linux-foundation.org Cc: shy828301@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 1/2] mm: mmap: no need to call khugepaged_enter_vma() for stack Date: Wed, 20 Dec 2023 22:59:42 -0800 Message-Id: <20231221065943.2803551-1-shy828301@gmail.com> X-Mailer: git-send-email 2.39.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1787642510921501147 X-GMAIL-MSGID: 1787642510921501147 From: Yang Shi We avoid allocating THP for temporary stack, even tnough khugepaged_enter_vma() is called for stack VMAs, it actualy returns false. So no need to call it in the first place at all. Signed-off-by: Yang Shi Reviewed-by: Yin Fengwei Reviewed-by: Yin Fengwei --- mm/mmap.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index b78e83d351d2..2ff79b1d1564 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2046,7 +2046,6 @@ static int expand_upwards(struct vm_area_struct *vma, unsigned long address) } } anon_vma_unlock_write(vma->anon_vma); - khugepaged_enter_vma(vma, vma->vm_flags); mas_destroy(&mas); validate_mm(mm); return error; @@ -2140,7 +2139,6 @@ int expand_downwards(struct vm_area_struct *vma, unsigned long address) } } anon_vma_unlock_write(vma->anon_vma); - khugepaged_enter_vma(vma, vma->vm_flags); mas_destroy(&mas); validate_mm(mm); return error;