Groups > linux.kernel > #1207152

Re: get_vmalloc_info() and /proc/meminfo insanely expensive

From	Andrew Morton <akpm@linux-foundation.org>
Newsgroups	linux.kernel
Subject	Re: get_vmalloc_info() and /proc/meminfo insanely expensive
Date	2015-08-13 22:30 +0200
Message-ID	<pX7ip-5FI-7@gated-at.bofh.it> (permalink)
References	<pWRnk-7WT-1@gated-at.bofh.it> <pWS01-tB-7@gated-at.bofh.it> <pWTIu-2Kb-1@gated-at.bofh.it>
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On Wed, 12 Aug 2015 22:52:44 -0700 Linus Torvalds <torvalds@linux-foundation.org> wrote:

> Looking at that mm/vmalloc.c file, the locking is pretty odd. It looks
> pretty strange in setup_vmalloc_vm(), for example. If that newly
> allocated "va" that we haven't even exposed to anybody yet has its
> address or size changed, we're screwed in so many ways.
> 
> I get the feeling this file should be rewritten. But that's not going
> to happen.

Nick Piggin started doing a rewrite in 2008 but it was never completed
(https://lwn.net/Articles/285341/).

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Thread

get_vmalloc_info() and /proc/meminfo insanely expensive Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-13 05:30 +0200
  Re: get_vmalloc_info() and /proc/meminfo insanely expensive Andrew Morton <akpm@linux-foundation.org> - 2015-08-13 06:10 +0200
    Re: get_vmalloc_info() and /proc/meminfo insanely expensive Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-13 08:00 +0200
      Re: get_vmalloc_info() and /proc/meminfo insanely expensive Rasmus Villemoes <linux@rasmusvillemoes.dk> - 2015-08-13 09:50 +0200
        Re: get_vmalloc_info() and /proc/meminfo insanely expensive Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-13 19:00 +0200
      Re: get_vmalloc_info() and /proc/meminfo insanely expensive Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-13 20:40 +0200
        Re: get_vmalloc_info() and /proc/meminfo insanely expensive Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-13 21:00 +0200
          Re: get_vmalloc_info() and /proc/meminfo insanely expensive David Rientjes <rientjes@google.com> - 2015-08-13 22:00 +0200
            Re: get_vmalloc_info() and /proc/meminfo insanely expensive Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-13 22:10 +0200
        Re: get_vmalloc_info() and /proc/meminfo insanely expensive Tony Luck <tony.luck@gmail.com> - 2015-08-13 23:30 +0200
          Re: get_vmalloc_info() and /proc/meminfo insanely expensive Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-14 01:00 +0200
      Re: get_vmalloc_info() and /proc/meminfo insanely expensive Andrew Morton <akpm@linux-foundation.org> - 2015-08-13 22:30 +0200

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