Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1207218
| From | Linus Torvalds <torvalds@linux-foundation.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: get_vmalloc_info() and /proc/meminfo insanely expensive |
| Date | 2015-08-14 01:00 +0200 |
| Message-ID | <pX9DA-q0-15@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> <pX5zY-32e-13@gated-at.bofh.it> <pX8eu-6ZO-17@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Thu, Aug 13, 2015 at 2:15 PM, Tony Luck <tony.luck@gmail.com> wrote:
>
> could you at least care enough to write that as
>
> if (time_after(now, last + HZ)) {
Absolutely not. That would be wrong.
"time_after()" covers half the "unsigned long" space (very much on
purpose). We want the cached case to trigger _only_ for the much
tighter case of exactly 1000 jiffies.
Linus
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll 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
csiph-web