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([2001:a61:2482:101:a081:4793:30bf:f3d5]) by smtp.gmail.com with ESMTPSA id df21sm15997034edb.27.2020.05.25.06.50.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 25 May 2020 06:50:39 -0700 (PDT) Cc: mtk.manpages@gmail.com, linux-man@vger.kernel.org, LKML , linux-mm@kvack.org, linux-api@vger.kernel.org, nilal@redhat.com, Florian Weimer , =?UTF-8?Q?Colm_MacC=c3=a1rtaigh?= , Mike Kravetz Subject: Re: [PATCH] proc.5: add "wf" to VmFlags in /proc/[pid]/smaps To: Ian Rogers , Rik van Riel References: <20200521222551.259804-1-irogers@google.com> From: "Michael Kerrisk (man-pages)" Message-ID: <1edcb7ac-bc5f-b9ec-a037-656005ae85e3@gmail.com> Date: Mon, 25 May 2020 15:50:38 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-man-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org On 5/22/20 1:13 AM, Ian Rogers wrote: > On Thu, May 21, 2020 at 3:25 PM Ian Rogers wrote: >> >> This patch documents a flag added in the following kernel commit: >> >> commit d2cd9ede6e193dd7d88b6d27399e96229a551b19 >> Author: Rik van Riel >> Date: Wed Sep 6 16:25:15 2017 -0700 >> >> mm,fork: introduce MADV_WIPEONFORK >> >> This was already documented in man2/madvise.2 in the commit: >> >> commit c0c4f6c29c494c466f3a2a6273c5b55b76a72927 >> Author: Rik van Riel >> Date: Tue Sep 19 20:32:00 2017 +0200 >> >> madvise.2: Document MADV_WIPEONFORK and MADV_KEEPONFORK >> >> Signed-off-by: Ian Rogers > > Doing a quick audit of fs/proc/task_mmu.c having noticed this flag was > missing I note: > - "mp" isn't documented, only possible with INTEL_MPX > - "nl" is documented but not present in show_smap_vma_flags > - "um" and "uw" aren't documented I took a shot at fixing these: mp - MPX-specific VMA (x86, since Linux 3.19) nl - non-linear mapping (removed in Linux 4.0) um - userfaultfd missing pages tracking (since Linux 4.3) uw - userfaultfd wprotect pages tracking (since Linux 4.3) sf - perform synchronous page faults (since Linux 4.15) Thanks, Michael -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/