linux-kernel - MAX_RT_PRIO - 1 Highest prio?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <46F1AEBB.6000809@comcast.net>
Date:	Wed, 19 Sep 2007 17:20:27 -0600
From:	Chris Rigg <cdrigg@...cast.net>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Willy Tarreau <w@....eu>, linux-kernel@...r.kernel.org
Subject: MAX_RT_PRIO - 1 Highest prio?

Hello,

First, I'm assuming that if I want my task to have the HIGHEST priority 
in the system (i.e. preempt any other task whenever it is put into the 
ready queue (assuming I have preemption turned on/configured)), I use 
sched_setscheduler (...) and use the sched_priority in sched_param for 
MAX_RT_PRIO -1. Is this correct?

Second, assuming that MAX_RT_PRIO-1 is the highest, would it be bad on 
an SMP/Hyperthreading system (that's using the migration thread 
balancing in 2.6.20.7) to set a task's priority to MAX_RT_PRIO -1 given 
the fact that the migration threads are already set to MAX_RT_PRIO -1? 
Should I be setting my task's prio to MAX_RT_PRIO-2 to not interfere 
with the load balancing?

Thanks,
Chris

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/