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

From: Tony Luck
Date: Thu Aug 13 2015 - 17:23:26 EST

On Thu, Aug 13, 2015 at 11:32 AM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> And I also can't find it in myself to care about the "on 32-bit,
> jiffies wraps in 49 days if HZ is 1000". If somebody carefully avoids
> ever reading /proc/meminfo for 49 days, and then reads it in _just_
> the right second, and gets a really stale value, I'm just going to do
> my honey badger impression.

could you at least care enough to write that as

if (time_after(now, last + HZ)) {

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