From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: gfa@sensaco.com
Cc: Linux Kernel list <linux-kernel@vger.kernel.org>
Subject: Re: setcontext syscall
Date: Thu, 20 Nov 2003 19:02:03 +1100 [thread overview]
Message-ID: <1069315322.31665.197.camel@gaston> (raw)
In-Reply-To: <3FBC6728.7030504@sensaco.com>
On Thu, 2003-11-20 at 18:03, George Fankhauser wrote:
> Hi there!
>
> I wonder why linux i386 does not implement setcontext as a syscall.
> Instead it's in in glibc in userspace.
On ppc32, we have started doing just that, a syscall called
sys_swapcontext that does all the variations of get/set_context.
We'll do as well on ppc64 soon.
It also helps perfs because on ppc, the kernel actually knows if
things like the FPU or the Altivec unit were ever used by the
process, and so if it's worth saving/restoring those registers
as part of the context.
Ben.
prev parent reply other threads:[~2003-11-20 8:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-20 7:03 setcontext syscall George Fankhauser
2003-11-20 8:02 ` Benjamin Herrenschmidt [this message]
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