From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ed1-f49.google.com (mail-ed1-f49.google.com [209.85.208.49]) (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 155891853 for ; Fri, 27 May 2022 10:47:53 +0000 (UTC) Received: by mail-ed1-f49.google.com with SMTP id z43so429183ede.1 for ; Fri, 27 May 2022 03:47:52 -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=E8hw1YxRdyFQiBunbdOQafA0vLjTqdy9/4gfOonLrFg=; b=cMw3nqupRwb9iJ0bAiEPeAgnOBYM1beNn1TObGXfHMIOMS1sTGGaToiA5nWxbTPG23 7Bz8Tf9v6QAYxGl16dxbYfTSm7cMnx29cgprRiQll1k8U5uaKV9vxmnxwM/ichP5gcNC 2MhV/Fgj+5yEwdzZBeNIph23msVCY1g5rCZhKgrErykccuFP7ubdDpN+0sMnTjuyAXgD WlQzdnKIlZD5ZXUjz2BiatWWlSOPzWc4K+AATgFhBrhSUWAhmb/cxMDw9moE2hFmKj7M tL+7T6Ejx28GCXKEAeHuZe351Sitn3HNDzC0SQ+cSYB/9oTan6ZNM36uDM5QH6P2nfo8 yO6g== 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=E8hw1YxRdyFQiBunbdOQafA0vLjTqdy9/4gfOonLrFg=; b=EWsDS3YwFWMu7bgV57hmsdukOSN7e1uEOklvI2C4gzPtugdEv0uzvPZvwSj9nZB98N cfCOFqmzaHaW4mH++nOkdpJmkcLmG7UIAMsYcBFV/jw7HtML139t4qzAoNAUMnV3LxEd X4mgocp+I3J3pi3C6L5FzQC+Z9q+8m72DyOFjAho5rUA4GXSay89Hv4AWgkdGxLr79SG bTcjcwutEFeLsf1knvXx5dISA+KyGvZTfJXrXKONZI8DBIqMREG3isbJbN2ji3YlqyQy fgvHiW2cqTzZ9JDNmJAS523lM954av3cAuh3GRl8H14bzMVT4aPlRhwYBSoS3GnZWeYu Cdlw== X-Gm-Message-State: AOAM531gro2KvMTyxL4NBELQ7DsY18iQTYIAcS2Rc9lOo1cQUgz4Otap uGU7EiM9WE5sgUamc6DsRQo= X-Google-Smtp-Source: ABdhPJyTYr0OkS3+nT4wN/g4MnpnJWE858fclOQNBvUdUSBEzGJbKuxqnWjjUb04IleiIrgnKZ+Spw== X-Received: by 2002:a05:6402:1cc1:b0:413:2b12:fc49 with SMTP id ds1-20020a0564021cc100b004132b12fc49mr43833744edb.118.1653648471305; Fri, 27 May 2022 03:47:51 -0700 (PDT) Received: from orion.localdomain ([93.99.228.15]) by smtp.gmail.com with ESMTPSA id v4-20020a50a444000000b0042ab87ea713sm777389edb.22.2022.05.27.03.47.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 May 2022 03:47:49 -0700 (PDT) Received: by orion.localdomain (Postfix, from userid 1003) id 5148EA0293; Fri, 27 May 2022 12:48:18 +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 2/2] [PATCH 2/2] mm: add merging after mremap resize Date: Fri, 27 May 2022 12:48:10 +0200 Message-Id: <20220527104810.24736-3-matenajakub@gmail.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220527104810.24736-1-matenajakub@gmail.com> References: <20220527104810.24736-1-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 | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/mm/mremap.c b/mm/mremap.c index 303d3290b938..c41237e62156 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -9,6 +9,7 @@ */ #include +#include #include #include #include @@ -1022,8 +1023,11 @@ 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