Re: [PATCH 3/3 v3] mm/vmalloc: Cache the vmalloc memory info

From	Ingo Molnar <mingo@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH 3/3 v3] mm/vmalloc: Cache the vmalloc memory info
Date	2015-08-24 09:10 +0200
Message-ID	<q0U3g-wd-13@gated-at.bofh.it> (permalink)
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* Rasmus Villemoes <linux@rasmusvillemoes.dk> wrote:

> I was curious why these fields were ever added to /proc/meminfo, and dug
> up this:
> 
> commit d262ee3ee6ba4f5f6125571d93d9d63191d2ef76
> Author: Andrew Morton <akpm@digeo.com>
> Date:   Sat Apr 12 12:59:04 2003 -0700
> 
>     [PATCH] vmalloc stats in /proc/meminfo
>     
>     From: Matt Porter <porter@cox.net>
>     
>     There was a thread a while back on lkml where Dave Hansen proposed this
>     simple vmalloc usage reporting patch.  The thread pretty much died out as
>     most people seemed focused on what VM loading type bugs it could solve.  I
>     had posted that this type of information was really valuable in debugging
>     embedded Linux board ports.  A common example is where people do arch
>     specific setup that limits there vmalloc space and then they find modules
>     won't load.  ;) Having the Vmalloc* info readily available is real useful in
>     helping folks to fix their kernel ports.
> 
> That thread is at <http://thread.gmane.org/gmane.linux.kernel/53360>.
> 
> [Maybe one could just remove the fields and see if anybody actually
> notices/cares any longer. Or, if they are only used by kernel
> developers, put them in their own file.]

So instead of removing the fields (which I'm quite sure is an ABI breaker as it 
could break less robust /proc/meminfo parsers and scripts), we could just report 
'0' all the time - and have the real info somewhere else?

Thanks,

	Ingo
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Thread

Re: [PATCH 0/3] mm/vmalloc: Cache the /proc/meminfo vmalloc statistics "George Spelvin" <linux@horizon.com> - 2015-08-23 06:50 +0200
  Re: [PATCH 0/3] mm/vmalloc: Cache the /proc/meminfo vmalloc  statistics Ingo Molnar <mingo@kernel.org> - 2015-08-23 08:10 +0200
    Re: [PATCH 0/3] mm/vmalloc: Cache the /proc/meminfo vmalloc statistics "George Spelvin" <linux@horizon.com> - 2015-08-23 08:50 +0200
      [PATCH 3/3 v3] mm/vmalloc: Cache the vmalloc memory info Ingo Molnar <mingo@kernel.org> - 2015-08-23 10:20 +0200
        Re: [PATCH 3/3 v3] mm/vmalloc: Cache the vmalloc memory info Rasmus Villemoes <linux@rasmusvillemoes.dk> - 2015-08-23 23:00 +0200
          Re: [PATCH 3/3 v3] mm/vmalloc: Cache the vmalloc memory info Ingo Molnar <mingo@kernel.org> - 2015-08-24 09:00 +0200
            Re: [PATCH 3/3 v3] mm/vmalloc: Cache the vmalloc memory info Rasmus Villemoes <linux@rasmusvillemoes.dk> - 2015-08-24 10:40 +0200
        Re: [PATCH 3/3 v3] mm/vmalloc: Cache the vmalloc memory info Rasmus Villemoes <linux@rasmusvillemoes.dk> - 2015-08-24 00:00 +0200
          Re: [PATCH 3/3 v3] mm/vmalloc: Cache the vmalloc memory info Ingo Molnar <mingo@kernel.org> - 2015-08-24 09:10 +0200
          Re: [PATCH 3/3 v3] mm/vmalloc: Cache the vmalloc memory info Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-25 18:40 +0200
            Re: [PATCH 3/3 v3] mm/vmalloc: Cache the vmalloc memory info Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-25 19:10 +0200
        Re: [PATCH 3/3 v3] mm/vmalloc: Cache the vmalloc memory info "George Spelvin" <linux@horizon.com> - 2015-08-24 03:10 +0200
          [PATCH 3/3 v4] mm/vmalloc: Cache the vmalloc memory info Ingo Molnar <mingo@kernel.org> - 2015-08-24 09:40 +0200
            Re: [PATCH 3/3 v4] mm/vmalloc: Cache the vmalloc memory info Ingo Molnar <mingo@kernel.org> - 2015-08-24 09:50 +0200
              [PATCH 3/3 v5] mm/vmalloc: Cache the vmalloc memory info Ingo Molnar <mingo@kernel.org> - 2015-08-24 10:00 +0200
                Re: [PATCH 3/3 v5] mm/vmalloc: Cache the vmalloc memory info "George Spelvin" <linux@horizon.com> - 2015-08-24 15:00 +0200
                [PATCH 3/3 v6] mm/vmalloc: Cache the vmalloc memory info Ingo Molnar <mingo@kernel.org> - 2015-08-25 12:00 +0200
                Re: [PATCH 3/3 v6] mm/vmalloc: Cache the vmalloc memory info "George Spelvin" <linux@horizon.com> - 2015-08-25 12:40 +0200
                Re: [PATCH 3/3 v6] mm/vmalloc: Cache the vmalloc memory info Peter Zijlstra <peterz@infradead.org> - 2015-08-25 15:10 +0200
                Re: [PATCH 3/3 v6] mm/vmalloc: Cache the vmalloc memory info Rasmus Villemoes <linux@rasmusvillemoes.dk> - 2015-08-25 16:30 +0200
                Re: [PATCH 3/3 v6] mm/vmalloc: Cache the vmalloc memory info "George Spelvin" <linux@horizon.com> - 2015-08-25 17:20 +0200
            Re: [PATCH 3/3 v4] mm/vmalloc: Cache the vmalloc memory info "John Stoffel" <john@stoffel.org> - 2015-08-24 15:50 +0200
              Re: [PATCH 3/3 v4] mm/vmalloc: Cache the vmalloc memory info "George Spelvin" <linux@horizon.com> - 2015-08-24 17:20 +0200
                Re: [PATCH 3/3 v4] mm/vmalloc: Cache the vmalloc memory info "John Stoffel" <john@stoffel.org> - 2015-08-24 18:00 +0200
        Re: [PATCH 3/3 v3] mm/vmalloc: Cache the vmalloc memory info Peter Zijlstra <peterz@infradead.org> - 2015-08-25 14:50 +0200

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