From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: "Luck, Tony" <tony.luck@intel.com>,
Linux Kernel list <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>,
nickpiggin@yahoo.com.au,
Linux Arch list <linux-arch@vger.kernel.org>
Subject: Re: [patch] sched: unlocked context-switches
Date: Sat, 09 Apr 2005 19:22:23 +1000 [thread overview]
Message-ID: <1113038543.9568.430.camel@gaston> (raw)
In-Reply-To: <20050409043848.GA2677@elte.hu>
On Sat, 2005-04-09 at 06:38 +0200, Ingo Molnar wrote:
> * Luck, Tony <tony.luck@intel.com> wrote:
>
> > >tested on x86, and all other arches should work as well, but if an
> > >architecture has irqs-off assumptions in its switch_to() logic
> > >it might break. (I havent found any but there may such assumptions.)
> >
> > The ia64_switch_to() code includes a section that can change a pinned
> > MMU mapping (when the stack for the new process is in a different
> > granule from the stack for the old process). [...]
>
> thanks - updated patch below. Any other architectures that switch the
> kernel stack in a nonatomic way? x86/x64 switches it atomically.
ppc64 already has a local_irq_save/restore in switch_to, around the low
level asm bits, so it should be fine.
Ben.
next prev parent reply other threads:[~2005-04-09 9:22 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-08 18:38 [patch] sched: unlocked context-switches Luck, Tony
2005-04-08 18:38 ` Luck, Tony
2005-04-09 4:38 ` Ingo Molnar
2005-04-09 6:28 ` Nick Piggin
2005-04-09 6:55 ` Ingo Molnar
2005-04-09 7:11 ` Nick Piggin
2005-04-09 9:22 ` Benjamin Herrenschmidt [this message]
2005-04-09 22:46 ` David S. Miller
2005-04-10 7:23 ` Richard Henderson
[not found] <3R6Ir-89Y-23@gated-at.bofh.it>
2005-04-09 6:32 ` David Mosberger-Tang
2005-04-09 7:07 ` Ingo Molnar
2005-04-09 7:15 ` David Mosberger
2005-04-09 22:58 ` David S. Miller
2005-04-10 6:43 ` Ingo Molnar
2005-04-12 1:06 ` David Mosberger
2005-04-12 2:12 ` Nick Piggin
2005-04-12 17:14 ` David Mosberger
2005-04-13 3:26 ` Nick Piggin
2005-04-12 6:42 ` Ingo Molnar
2005-04-12 17:15 ` David Mosberger
-- strict thread matches above, loose matches on Subject: below --
2005-04-08 12:16 Ingo Molnar
2005-04-29 9:09 ` Andrew Morton
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