From: Robert Love <rml@tech9.net>
To: Justin Carlson <justincarlson@cmu.edu>
Cc: mingo@elte.hu, Rusty Russell <rusty@rustcorp.com.au>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] I3 sched tweaks...
Date: 16 Jan 2002 16:27:09 -0500 [thread overview]
Message-ID: <1011216429.1083.95.camel@phantasy> (raw)
In-Reply-To: <1011215946.314.14.camel@gs256.sp.cs.cmu.edu>
In-Reply-To: <Pine.LNX.4.33.0201162343290.18971-100000@localhost.localdomain> <1011215440.814.82.camel@phantasy> <1011215946.314.14.camel@gs256.sp.cs.cmu.edu>
On Wed, 2002-01-16 at 16:19, Justin Carlson wrote:
> Don't forget that, in non-x86 land, current tends to be just kept in a
> register. No computations required. Certainly passing it around on,
> e.g. mips is a clear loss.
current is stored in a register (esp) in x86, too. This is why I
cautioned that looking up current was cheap -- I think every sane arch
stores current in some fast access way. That's why it is a macro -- it
is assembly code to quickly snag the address.
So is passing current still worth it?
Robert Love
next prev parent reply other threads:[~2002-01-16 21:26 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-16 5:49 [PATCH] I3 sched tweaks Rusty Russell
2002-01-16 9:15 ` Ingo Molnar
2002-01-16 9:17 ` Ingo Molnar
2002-01-16 10:34 ` Rusty Russell
2002-01-16 22:46 ` Ingo Molnar
2002-01-16 21:10 ` Robert Love
2002-01-16 21:19 ` Justin Carlson
2002-01-16 21:27 ` Robert Love [this message]
2002-01-16 23:31 ` Ingo Molnar
2002-01-17 13:01 ` bill davidsen
2002-01-16 21:31 ` Paul Mackerras
2002-01-17 3:37 ` Rusty Russell
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