Re: [2.4.17/18pre] VM and swap - it's really unusable

Momchil Velikov
2002-01-14T16:44:32Z

>>>>> "Oliver" == Oliver Neukum <520047054719-0001@t-online.de> writes:

Oliver> On Monday 14 January 2002 13:17, Momchil Velikov wrote:
>> >>>>> "yodaiken" == yodaiken <yodaiken@fsmlabs.com> writes:
>>
yodaiken> It's not even clear how preempt is supposed to interact with
>> SCHED_FIFO.
>>
>> How so ? The POSIX specification is not clear enough or it is not to be
>> followed ?

Oliver> You can have an rt task block on a lock held by a normal task that was
Oliver> preempted by a rt task of lower priority. The same problem as with the
Oliver> sched_idle patches.

This can happen with a non-preemptible kernel too. And it has nothing to
do with scheduling policy.