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

[Andrew Morton]

On Wed, 12 Aug 2015 22:52:44 -0700 Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> 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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