From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f43.google.com (mail-wm1-f43.google.com [209.85.128.43]) (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 8F8C1ED1 for ; Mon, 16 May 2022 12:53:47 +0000 (UTC) Received: by mail-wm1-f43.google.com with SMTP id r188-20020a1c44c5000000b003946c466c17so8199702wma.4 for ; Mon, 16 May 2022 05:53:47 -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=0Z8unS+I3KC7HgCSi3Sa8z96pMNRd1BvZvnwNMD3WTs=; b=A3Dlgex7+DnOnYZLaF9FBzoiuQTihhx3vEfDIIJp3ykd3bn66AKO/ul3Gml8GQK9jh f3hwwjHkZCiJ9DgKTkGT62t+28fyu4fPeH6rpjIS14P866udo2QEa/nNiX3bv362z4Bl rpJU+Bj6Cff+nP2ncVPO9oJ0cnBIsdpRo4ftBVxKQfEBRJFiWMtRksBNCkEDEZkQczGR WvnhZx97jd08S63rv/lP1ZWpwI8Mt8hiY5Uqjse+zT5wigM7wz3Athcrzf2qZgpS8z3H uysUaWSpR4Co9Q6TEPdesUrO5VMOoIu23/e7zZZGR04IZ88yHXaeQq1cL7Oqi10OAYTH IeVg== 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=0Z8unS+I3KC7HgCSi3Sa8z96pMNRd1BvZvnwNMD3WTs=; b=3bfTvesXBe71oylQIyfXdhmcDdcvMaLPLMocDAlyQWup/10qKQi+B/iU7fl/0PPGoX MlCsCbRhbeiDgCWTrLhq4YL3iDSDGbK++L+3G7ikZJ+Z55H45QHSDFFV3kJSR//GfU/y GF+XEjJUA4ABBhbjANUAHctpl7Y2hH21OlHAukpG5pNQOnjxruyXIcVuzaDSGXAgSIto Vj4tcZCFrOYv7qxzS5RoTZClFlYyqIQJQdEdeOPsQEF4PtUCFslrDqRU1WzcrPSSYXwp DdoIejCBs5rSzNcvabd7NKNOxo0DGI+LsT9LVjQOEnk7yYPJ3EPea6ScBPyivXTJQpFI UUow== X-Gm-Message-State: AOAM533DnrBkSDGmn1aKSp23BidowK6uTLJ2nZpVLNViT1PgZ1jnuJdL G7gPWtGYKJrIrGyRYwhIt7U= X-Google-Smtp-Source: ABdhPJzV07JC9Mg9zVfcWX1VUOyPfRogVK8bD1F7lIrfsaUsrqugDWj/POWQV+HHzB0bOOI1Q6XAQg== X-Received: by 2002:a05:600c:1da5:b0:395:baf7:ca4c with SMTP id p37-20020a05600c1da500b00395baf7ca4cmr16782305wms.99.1652705625778; Mon, 16 May 2022 05:53:45 -0700 (PDT) Received: from orion.localdomain ([93.99.228.15]) by smtp.gmail.com with ESMTPSA id p15-20020a7bcdef000000b00394517e7d98sm10372100wmj.25.2022.05.16.05.53.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 May 2022 05:53:45 -0700 (PDT) Received: by orion.localdomain (Postfix, from userid 1003) id 8F349A0E77; Mon, 16 May 2022 14:54:07 +0200 (CEST) From: =?UTF-8?q?Jakub=20Mat=C4=9Bna?= To: linux-mm@kvack.org Cc: 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, david@redhat.com, =?UTF-8?q?Jakub=20Mat=C4=9Bna?= Subject: [RFC PATCH v3 2/6] [PATCH 2/6] mm: add merging after mremap resize Date: Mon, 16 May 2022 14:54:01 +0200 Message-Id: <20220516125405.1675-3-matenajakub@gmail.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220516125405.1675-1-matenajakub@gmail.com> References: <20220516125405.1675-1-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 | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/mm/mremap.c b/mm/mremap.c index 303d3290b938..75cda854ec58 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -9,6 +9,7 @@ */ #include +#include #include #include #include @@ -1022,8 +1023,10 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, } } - if (vma_adjust(vma, vma->vm_start, addr + new_len, - vma->vm_pgoff, NULL)) { + if (!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))) { vm_unacct_memory(pages); ret = -ENOMEM; goto out; -- 2.35.1