From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ed1-f46.google.com (mail-ed1-f46.google.com [209.85.208.46]) (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 1D8B423AA for ; Fri, 27 May 2022 21:16:43 +0000 (UTC) Received: by mail-ed1-f46.google.com with SMTP id er5so6832736edb.12 for ; Fri, 27 May 2022 14:16:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=i6lPNcDzycIov1mSkrT1DuTIerHURYERHQ0SJ25h8ww=; b=SoBDYj9niVpCHTx5kJvkoGyZ8mBE7SuG/84fscSrduUQp5/ePxiInmUat6IaNSgsWR ga004ByY6lw6IyWbt1dkH46Wj6IaADkMP3e5Gr3o/YxGu7aLpNsUSeMImlSmPOV5JL9b MYZK/V+iUSyuYcIK8JFWFYdacOEe5yZ7LExyb91R0DRWdJAnW9ujXjGT1dN84xF1og+d vUZDh5DE6ZhFqolekBXBC9iauZdKhFOKYHdJ9unGcfGmEMYt/yuM1k4r8H/RDsTUx7AN isJw5LmdbEKVHxH2uzfveIU92LLMo+YNrBVdUuMQA4ivCIozuBJlQKuiAhEDpc4eXWyg xFtQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=i6lPNcDzycIov1mSkrT1DuTIerHURYERHQ0SJ25h8ww=; b=lIBBKUH67kMUKQBoip4ut/vDmJRmfHSvAyjFHiP9ZYRA+dvNtFfi77uCRGovF7M4qS mOdhlO8+lBpgCjzuryDtZsMaPGkEwkYiE4lsTXY8ge03RaPfVTGhFW7Hjc95vv9arC5P vJeY4uf6NlcRt69TkYlKiKdt/AGKOlmd+mjUq+FyHyepWBai8R6r2R6q2wbAzK2+xh6+ v1umHL9cJUFB5LDjZSsMJ+en6GZQenD5nbggprVyM2wgutox1ouzFSK9tTwfAxgLekv8 UDDhTggoITOai7QhlKHU5dfm+5A8LIety6v1G74SatcgqbTYyPBUPgeAZ2NzCIQGxqJI eMSA== X-Gm-Message-State: AOAM533jcoWGcCT96pAkFKnGIfgrYzwFD40b5ShkSGR3Lbqsm8ido3ml KJF/c4K+Axf41xFK0+XDicE= X-Google-Smtp-Source: ABdhPJxFAs7eRYdqOiXTG1ydQhgXTOtFZa6dkQhVCr12wsO14FNnGTH7jFVGtNHeUysMTLDZpoIM7Q== X-Received: by 2002:a05:6402:2071:b0:42b:dfa4:d4e1 with SMTP id bd17-20020a056402207100b0042bdfa4d4e1mr8968698edb.70.1653686201430; Fri, 27 May 2022 14:16:41 -0700 (PDT) Received: from orion.localdomain ([93.99.228.15]) by smtp.gmail.com with ESMTPSA id o8-20020a1709064f8800b006f3ef214e70sm1746739eju.214.2022.05.27.14.16.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 May 2022 14:16:40 -0700 (PDT) Received: by orion.localdomain (Postfix, from userid 1003) id 14EF4A0019; Fri, 27 May 2022 23:17:10 +0200 (CEST) From: =?UTF-8?q?Jakub=20Mat=C4=9Bna?= To: akpm@linux-foundation.org Cc: linux-mm@kvack.org, patches@lists.linux.dev, linux-kernel@vger.kernel.org, vbabka@suse.cz, mhocko@kernel.org, mgorman@techsingularity.net, willy@infradead.org, liam.howlett@oracle.com, hughd@google.com, kirill@shutemov.name, riel@surriel.com, rostedt@goodmis.org, peterz@infradead.org, =?UTF-8?q?Jakub=20Mat=C4=9Bna?= Subject: [PATCH v2 2/2] [PATCH 2/2] mm: add merging after mremap resize Date: Fri, 27 May 2022 23:17:08 +0200 Message-Id: <20220527211708.839033-3-matenajakub@gmail.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220527211708.839033-1-matenajakub@gmail.com> References: <20220527211708.839033-1-matenajakub@gmail.com> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When mremap call results in expansion, it might be possible to merge the VMA with the next VMA which might become adjacent. This patch adds vma_merge call after the expansion is done to try and merge. Signed-off-by: Jakub Matěna --- mm/mremap.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/mm/mremap.c b/mm/mremap.c index 303d3290b938..21dfa15e8200 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -9,6 +9,7 @@ */ #include +#include #include #include #include @@ -23,6 +24,7 @@ #include #include #include +#include #include #include @@ -1022,8 +1024,11 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, } } - if (vma_adjust(vma, vma->vm_start, addr + new_len, - vma->vm_pgoff, NULL)) { + vma = vma_merge(mm, vma, addr + old_len, addr + new_len, + vma->vm_flags, vma->anon_vma, vma->vm_file, + vma->vm_pgoff + (old_len >> PAGE_SHIFT), vma_policy(vma), + vma->vm_userfaultfd_ctx, anon_vma_name(vma)); + if (!vma) { vm_unacct_memory(pages); ret = -ENOMEM; goto out; -- 2.35.1