From: Ingo Molnar <mingo@elte.hu>
To: Lennart Poettering <mzxreary@0pointer.de>
Cc: linux-kernel@vger.kernel.org, peterz@infradead.org
Subject: Re: [PATCH] scheduler: introduce SCHED_RESET_ON_FORK scheduling policy flag, Second try
Date: Fri, 5 Jun 2009 13:54:10 +0200 [thread overview]
Message-ID: <20090605115410.GA16008@elte.hu> (raw)
In-Reply-To: <20090529083840.GA15516@omega>
* Lennart Poettering <mzxreary@0pointer.de> wrote:
> Why expose this via sched_setscheduler() and not other syscalls
> such as prctl() or sched_setparam()?
>
> prctl() does not take a pid parameter. Due to that it would be
> impossible to modify this flag for other processes than the
> current one.
>
> The struct passed to sched_setparam() can unfortunately not be
> extended without breaking compatibility, since sched_setparam()
> lacks a size parameter.
Well, it could be extended, if we wanted to. Right now
sched_priority has a valid value of 0 to 100. We could introduce a
new value '-1' to mean: 'extended struct sched_param'.
A new getparam syscall could then be introduced - only used by new
user-space.
Ingo
next prev parent reply other threads:[~2009-06-05 11:54 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-29 8:38 [PATCH] scheduler: introduce SCHED_RESET_ON_FORK scheduling policy flag, Second try Lennart Poettering
2009-05-29 9:28 ` Peter Zijlstra
2009-05-29 10:39 ` Lennart Poettering
2009-06-03 14:07 ` Lennart Poettering
2009-06-05 11:54 ` Ingo Molnar [this message]
2009-06-05 14:55 ` Lennart Poettering
2009-06-07 10:11 ` Ingo Molnar
-- strict thread matches above, loose matches on Subject: below --
2009-07-03 12:33 Raz
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