lkml.org 
[lkml]   [2019]   [Apr]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH] sched/core: expand sched_getaffinity(2) to return number of CPUs
Date
* Peter Zijlstra:

> On Fri, Apr 05, 2019 at 12:16:39PM +0200, Florian Weimer wrote:
>
>> > True; but I suppose glibc already does lots of that anyway, right? It
>> > does contain the right information.
>>
>> If I recall correctly my last investigation,
>> /sys/devices/system/cpu/possible does not reflect the size of the
>> affinity mask, either.
>
> Strictly speaking correct; the bitmap can be longer than the highest
> possible cpu number, however the remainder would be 0-padding and could
> thus be stripped without issue.

Doesn't the kernel still enforce the larget bitmap in sched_getaffinity,
even if the bits are always zero?

Thanks,
Florian

\
 
 \ /
  Last update: 2019-04-05 13:09    [W:0.062 / U:9.580 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site