On 07/18/2012 04:26 AM, Rob Landley wrote:
On 07/15/2012 06:34 AM, Elie De Brauwer wrote:
Hello all,
In attach you can find an initial version of 'taskset'. It allows
setting the cpu affinity of a given PID (or all tasks related with a
given PID/TID). cpu affinity should be entered in hex, when no affinity
is given the affinity for the process or the group of tasks is displayed.
Where did the -a flag come from? The taskset on my system matches this
man page:
Whatever version of util-linux linux.die.net might 've stolen the
manpage from, it for sure isn't a recent version. I just looked at the
manpage on my debian system (util-linux-2.20.1) and it resembles this
http://manpages.ubuntu.com/manpages/precise/man1/taskset.1.html (you
need to scroll down to see the options.
(I think this patch http://www.digipedia.pl/usenet/thread/19513/138/
more or less shows the -a specific changes).
http://linux.die.net/man/1/taskset
In which taskset is a filter like nice, and -p says work on an existing
pid instead of launching a new one. I'd guess -a is the behavior it
always has, since "tasks" basically means "threads". (Unless containers
use that too...)
Indeed, except that if you use it with -p, the -a is not default (so it
will only look at the tid specified).
By the way: "taskset -p [mask] pid" is _crazy_. pid should be an
argument to -p, ala "taskset mask [-p pid | arg...].
I'm not sure whether to consider the man page's command line
grandfathered in (otherwise "taskset -p mask pid" won't work) or just go
ahead and make the pid an argument to -p. I _can_ implement either but
the current behavior makes no sense and there's no standard and your
submission didn't even match what was there so it's not like that's
_less_ compatible...
Well, my submission matches (or at least was intended) to match
taskset [-a] mask-in-hex pid
Meaning to works as renice, rather than nice. I'm open to suggestions, I
can as well the 'work-as-nice' functionality,
Confused,
Rob
--
Elie De Brauwer
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