From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 30FBFC61DA4 for ; Mon, 6 Mar 2023 14:05:05 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id ABF9E280003; Mon, 6 Mar 2023 09:05:04 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id A6EE7280001; Mon, 6 Mar 2023 09:05:04 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 93703280003; Mon, 6 Mar 2023 09:05:04 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 831CE280001 for ; Mon, 6 Mar 2023 09:05:04 -0500 (EST) Received: from smtpin18.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 48253AAB35 for ; Mon, 6 Mar 2023 14:05:04 +0000 (UTC) X-FDA: 80538644928.18.48C618C Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by imf17.hostedemail.com (Postfix) with ESMTP id DCC8E40006 for ; Mon, 6 Mar 2023 14:05:01 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=Xr+Qxkfq; spf=pass (imf17.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1678111502; a=rsa-sha256; cv=none; b=HbsnW7vjBX8KTQXYvKHeQwrOPGyK6lMtMRqeWJIBnZHQKhmQISvGb+a4x1QX9ZX1crw28q akIu+pLFOGgd48ZaFF/Csp0dGOUzolT5idnGIbWi6wpLEdfraONxMaZdyqXRrNwjU9osiw tyh1lGEfF94QcvxVARcIO9FPHawhei0= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=Xr+Qxkfq; spf=pass (imf17.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1678111502; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=MpjQI4eZNUyy1a8d8ToFfb8eUyexksQgeyNW7lbutB0=; b=I5hdyUYgjqd3+qvSBsuamFaYFTF50782B7hNAJanj9O0PpaW/q6gLVie7Q5937KXz89eYh IFTHouYc9/LE89UQgP3Pr2azeCd8/mfFG3sdnTeoKJit9S50DN3Tq/ZCIvM0nmKxKp/rFf Y3Uc1oEmsQZiX9olLPm0Tw7RfJRNSeo= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1678111501; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=MpjQI4eZNUyy1a8d8ToFfb8eUyexksQgeyNW7lbutB0=; b=Xr+Qxkfq6t3RfHZrrgqWpLcfcgYL8gNUljwpdMH1O6MtWaLX/5oJD3z3Nw4WIK/plbAmnN QVGC6YzmFwCWw4Ym9FcooXZTPVNOqUhmY0u/jIuxmqEgN6rv8z8GRf71U5BJHHECPKFLvM aiM+WLvQNurH5daheyNx0Yq/eUhgK0o= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-231-yaTgqvQ8MeGaTuOqoJ9-Nw-1; Mon, 06 Mar 2023 09:05:00 -0500 X-MC-Unique: yaTgqvQ8MeGaTuOqoJ9-Nw-1 Received: by mail-wm1-f71.google.com with SMTP id t1-20020a7bc3c1000000b003dfe223de49so6784959wmj.5 for ; Mon, 06 Mar 2023 06:04:59 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678111499; h=content-transfer-encoding:in-reply-to:organization:from:references :cc:to:content-language:subject:user-agent:mime-version:date :message-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=MpjQI4eZNUyy1a8d8ToFfb8eUyexksQgeyNW7lbutB0=; b=wftEaRt6q282IFtbYWqQ4PGuyyeBGC6qLLoeC2UK6AJLS+clp9vbH3I1QOuhQcEJzZ RZjGCsXF63dpyWFFfJIimUZWBC+nerM+5edK/8lb9nVQizYbMGW3h8sA2oHZvB+2Nq2j b93mq4QL8LokUO6hsGv+1om3QOb4kNIJx+SuuFgMjQIOjg0uEb/KEOcFYzVrFQB7h9co dMXflBbsUrCOYbm2itDZRO5fE/Nun+2zHnmDgS/ilkQf1Dx3FTolXcvRn860IQEeqkp6 rZX9wpj3ndRgLMP1WnSo+D1kazyG/Iofg+Y5A1yuXE/PCX5BFLWgRbTkhu9plzXGbxK+ YfPA== X-Gm-Message-State: AO0yUKWsjGEvgcuxlyicJ7ulC+f6WbhmW6oeYCSPNxF2AH1Zus2CaEI6 ATvd1pcdPnTThrxXODoQNzBuYJGejagcR2MfQAMDlDEFYmZjqMO4luuweXmTfl8GasVqS6cnqUg M73baapMDt6U= X-Received: by 2002:a05:600c:1990:b0:3e2:20c7:6553 with SMTP id t16-20020a05600c199000b003e220c76553mr9340867wmq.13.1678111498923; Mon, 06 Mar 2023 06:04:58 -0800 (PST) X-Google-Smtp-Source: AK7set9t/0QaqgG9LAMjdWr1ncqogSGh8xkuI6ju2p3ppfz/c1knl1GVMAO3FPLfnnJj9dP9HbPRUA== X-Received: by 2002:a05:600c:1990:b0:3e2:20c7:6553 with SMTP id t16-20020a05600c199000b003e220c76553mr9340820wmq.13.1678111498605; Mon, 06 Mar 2023 06:04:58 -0800 (PST) Received: from ?IPV6:2003:cb:c704:3500:b8a3:191c:eae:cc05? (p200300cbc7043500b8a3191c0eaecc05.dip0.t-ipconnect.de. [2003:cb:c704:3500:b8a3:191c:eae:cc05]) by smtp.gmail.com with ESMTPSA id y33-20020a05600c342100b003e21f20b646sm10432673wmp.21.2023.03.06.06.04.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 06 Mar 2023 06:04:58 -0800 (PST) Message-ID: Date: Mon, 6 Mar 2023 15:04:57 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 Subject: Re: [PATCH 5/6] shmem: update documentation To: Luis Chamberlain , hughd@google.com, akpm@linux-foundation.org, willy@infradead.org, brauner@kernel.org Cc: linux-mm@kvack.org, p.raghav@samsung.com, da.gomez@samsung.com, a.manzanares@samsung.com, dave@stgolabs.net, yosryahmed@google.com, keescook@chromium.org, patches@lists.linux.dev, linux-kernel@vger.kernel.org References: <20230302232758.888157-1-mcgrof@kernel.org> <20230302232758.888157-6-mcgrof@kernel.org> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20230302232758.888157-6-mcgrof@kernel.org> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: DCC8E40006 X-Rspamd-Server: rspam01 X-Stat-Signature: 5o75ruiawwabec1ksojmeeawwxyr1d3s X-HE-Tag: 1678111501-338602 X-HE-Meta: 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 t9HLI+5N fodffgxQDGkZWgMFTBhYPfsABDLeuoUpDK8bugWvzKsp+p+SpZaQBJMx0QTlA9Gqu8kfb6CB2/lSwkR3M8HcZaQqDdeZd9M1nNwqntodHr00UHFj81pESfZIs7gKrAKfbrgsrqMmD4TL1lDyv7Dk3MUm3HoypNM/u6wYGrKjlhg3wdTfgdvQfczIVY5d/WJgVdczUUP4o/NDG12j2lySDNsnM7XSRMw1mQYOqClEoHlvNjIqfWdQid1KcuJLJ99BBb+OuarVRamcrtDh8Q+/a0F8tjpbS1+36/Go68ArVdw9daBBj8nIWSIHNaoIvBn3G5uTor3eNy7eKiNSxT7AMgWsrx59cEFtE/lhDzw+t0lv7dQrnEk1UBwKfMe/7zorLb5gRXuu78cxWc/QJPdcqdhxD3fhCar5UYNxFjvslbOwDfaArIqM63NMqx53BOzzDoaoc8x5Jjnz5sVurRLUPn/w/ER+qnomsn7C9+5/8qe/n9+s= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 03.03.23 00:27, Luis Chamberlain wrote: > Update the docs to reflect a bit better why some folks prefer tmpfs > over ramfs and clarify a bit more about the difference between brd > ramdisks. > > Signed-off-by: Luis Chamberlain > --- > Documentation/filesystems/tmpfs.rst | 27 +++++++++++++++++++-------- > 1 file changed, 19 insertions(+), 8 deletions(-) > > diff --git a/Documentation/filesystems/tmpfs.rst b/Documentation/filesystems/tmpfs.rst > index 0408c245785e..e77ebdacadd0 100644 > --- a/Documentation/filesystems/tmpfs.rst > +++ b/Documentation/filesystems/tmpfs.rst > @@ -13,14 +13,25 @@ everything stored therein is lost. > > tmpfs puts everything into the kernel internal caches and grows and > shrinks to accommodate the files it contains and is able to swap > -unneeded pages out to swap space. It has maximum size limits which can > -be adjusted on the fly via 'mount -o remount ...' > - > -If you compare it to ramfs (which was the template to create tmpfs) > -you gain swapping and limit checking. Another similar thing is the RAM > -disk (/dev/ram*), which simulates a fixed size hard disk in physical > -RAM, where you have to create an ordinary filesystem on top. Ramdisks > -cannot swap and you do not have the possibility to resize them. > +unneeded pages out to swap space. I suppose, in contrast to ramfs, tmpfs also supports THP. Maybe worth adding as well. Reviewed-by: David Hildenbrand -- Thanks, David / dhildenb