From: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
To: Ian Rogers <irogers@google.com>, Rik van Riel <riel@redhat.com>
Cc: mtk.manpages@gmail.com, linux-man@vger.kernel.org,
LKML <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org, linux-api@vger.kernel.org, nilal@redhat.com,
"Florian Weimer" <fweimer@redhat.com>,
"Colm MacCártaigh" <colm@allcosts.net>,
"Mike Kravetz" <mike.kravetz@oracle.com>
Subject: Re: [PATCH] proc.5: add "wf" to VmFlags in /proc/[pid]/smaps
Date: Mon, 25 May 2020 15:50:38 +0200 [thread overview]
Message-ID: <1edcb7ac-bc5f-b9ec-a037-656005ae85e3@gmail.com> (raw)
In-Reply-To: <CAP-5=fXjXgWEgp9gqReByrDBTvjDbPEsubeAFxrpxj_+FsFn6w@mail.gmail.com>
On 5/22/20 1:13 AM, Ian Rogers wrote:
> On Thu, May 21, 2020 at 3:25 PM Ian Rogers <irogers@google.com> wrote:
>>
>> This patch documents a flag added in the following kernel commit:
>>
>> commit d2cd9ede6e193dd7d88b6d27399e96229a551b19
>> Author: Rik van Riel <riel@redhat.com>
>> 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 <riel@redhat.com>
>> Date: Tue Sep 19 20:32:00 2017 +0200
>>
>> madvise.2: Document MADV_WIPEONFORK and MADV_KEEPONFORK
>>
>> Signed-off-by: Ian Rogers <irogers@google.com>
>
> 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/
next prev parent reply other threads:[~2020-05-25 13:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-21 22:25 [PATCH] proc.5: add "wf" to VmFlags in /proc/[pid]/smaps Ian Rogers
2020-05-21 23:13 ` Ian Rogers
2020-05-25 13:50 ` Michael Kerrisk (man-pages) [this message]
2020-05-25 14:59 ` Kirill A. Shutemov
2020-05-25 18:50 ` Michael Kerrisk (man-pages)
2020-05-25 13:48 ` Michael Kerrisk (man-pages)
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