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* [PATCH] proc.5: add "wf" to VmFlags in /proc/[pid]/smaps
@ 2020-05-21 22:25 Ian Rogers
  2020-05-21 23:13 ` Ian Rogers
  2020-05-25 13:48 ` Michael Kerrisk (man-pages)
  0 siblings, 2 replies; 6+ messages in thread
From: Ian Rogers @ 2020-05-21 22:25 UTC (permalink / raw)
  To: Rik van Riel, mtk.manpages
  Cc: linux-man, linux-kernel, linux-mm, linux-api, nilal,
	Florian Weimer, Colm MacCártaigh, Mike Kravetz, Ian Rogers

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>
---
 man5/proc.5 | 1 +
 1 file changed, 1 insertion(+)

diff --git a/man5/proc.5 b/man5/proc.5
index 46d603f28..3e5b91af0 100644
--- a/man5/proc.5
+++ b/man5/proc.5
@@ -2020,6 +2020,7 @@ encoded using the following two-letter codes:
     ht  - area uses huge tlb pages
     nl  - non-linear mapping
     ar  - architecture specific flag
+    wf  - wipe on fork
     dd  - do not include area into core dump
     sd  - soft-dirty flag
     mm  - mixed map area
-- 
2.27.0.rc0.183.gde8f92d652-goog


^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH] proc.5: add "wf" to VmFlags in /proc/[pid]/smaps
  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)
  2020-05-25 13:48 ` Michael Kerrisk (man-pages)
  1 sibling, 1 reply; 6+ messages in thread
From: Ian Rogers @ 2020-05-21 23:13 UTC (permalink / raw)
  To: Rik van Riel, mtk.manpages
  Cc: linux-man, LKML, linux-mm, linux-api, nilal, Florian Weimer,
	Colm MacCártaigh, Mike Kravetz

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

Thanks,
Ian

> ---
>  man5/proc.5 | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/man5/proc.5 b/man5/proc.5
> index 46d603f28..3e5b91af0 100644
> --- a/man5/proc.5
> +++ b/man5/proc.5
> @@ -2020,6 +2020,7 @@ encoded using the following two-letter codes:
>      ht  - area uses huge tlb pages
>      nl  - non-linear mapping
>      ar  - architecture specific flag
> +    wf  - wipe on fork
>      dd  - do not include area into core dump
>      sd  - soft-dirty flag
>      mm  - mixed map area
> --
> 2.27.0.rc0.183.gde8f92d652-goog
>

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH] proc.5: add "wf" to VmFlags in /proc/[pid]/smaps
  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 13:48 ` Michael Kerrisk (man-pages)
  1 sibling, 0 replies; 6+ messages in thread
From: Michael Kerrisk (man-pages) @ 2020-05-25 13:48 UTC (permalink / raw)
  To: Ian Rogers, Rik van Riel
  Cc: mtk.manpages, linux-man, linux-kernel, linux-mm, linux-api,
	nilal, Florian Weimer, Colm MacCártaigh, Mike Kravetz

Hello Ian,

On 5/22/20 12:25 AM, Ian Rogers 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

Thanks. Patch applied.

Cheers,

Michael

> Signed-off-by: Ian Rogers <irogers@google.com>
> ---
>  man5/proc.5 | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/man5/proc.5 b/man5/proc.5
> index 46d603f28..3e5b91af0 100644
> --- a/man5/proc.5
> +++ b/man5/proc.5
> @@ -2020,6 +2020,7 @@ encoded using the following two-letter codes:
>      ht  - area uses huge tlb pages
>      nl  - non-linear mapping
>      ar  - architecture specific flag
> +    wf  - wipe on fork
>      dd  - do not include area into core dump
>      sd  - soft-dirty flag
>      mm  - mixed map area
> 


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH] proc.5: add "wf" to VmFlags in /proc/[pid]/smaps
  2020-05-21 23:13 ` Ian Rogers
@ 2020-05-25 13:50   ` Michael Kerrisk (man-pages)
  2020-05-25 14:59     ` Kirill A. Shutemov
  0 siblings, 1 reply; 6+ messages in thread
From: Michael Kerrisk (man-pages) @ 2020-05-25 13:50 UTC (permalink / raw)
  To: Ian Rogers, Rik van Riel
  Cc: mtk.manpages, linux-man, LKML, linux-mm, linux-api, nilal,
	Florian Weimer, Colm MacCártaigh, Mike Kravetz

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/

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH] proc.5: add "wf" to VmFlags in /proc/[pid]/smaps
  2020-05-25 13:50   ` Michael Kerrisk (man-pages)
@ 2020-05-25 14:59     ` Kirill A. Shutemov
  2020-05-25 18:50       ` Michael Kerrisk (man-pages)
  0 siblings, 1 reply; 6+ messages in thread
From: Kirill A. Shutemov @ 2020-05-25 14:59 UTC (permalink / raw)
  To: Michael Kerrisk (man-pages)
  Cc: Ian Rogers, Rik van Riel, linux-man, LKML, linux-mm, linux-api,
	nilal, Florian Weimer, Colm MacCártaigh, Mike Kravetz

On Mon, May 25, 2020 at 03:50:38PM +0200, Michael Kerrisk (man-pages) wrote:
> 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)

This one is gone. The patch to remove leftovers of MPX is linux-next.

-- 
 Kirill A. Shutemov

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH] proc.5: add "wf" to VmFlags in /proc/[pid]/smaps
  2020-05-25 14:59     ` Kirill A. Shutemov
@ 2020-05-25 18:50       ` Michael Kerrisk (man-pages)
  0 siblings, 0 replies; 6+ messages in thread
From: Michael Kerrisk (man-pages) @ 2020-05-25 18:50 UTC (permalink / raw)
  To: Kirill A. Shutemov
  Cc: Ian Rogers, Rik van Riel, linux-man, LKML, Linux-MM, Linux API,
	nilal, Florian Weimer, Colm MacCártaigh, Mike Kravetz

On Mon, 25 May 2020 at 16:59, Kirill A. Shutemov <kirill@shutemov.name> wrote:
>
> On Mon, May 25, 2020 at 03:50:38PM +0200, Michael Kerrisk (man-pages) wrote:
> > 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)
>
> This one is gone. The patch to remove leftovers of MPX is linux-next.

Thanks, Kirill. I'll simply remove that entry.

Cheers,

Michael

-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/

^ permalink raw reply	[flat|nested] 6+ messages in thread

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Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
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)
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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