From: "David S. Miller" <davem@davemloft.net>
To: paulus@samba.org
Cc: olof@lixom.net, linux-arch@vger.kernel.org,
linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org
Subject: Re: [RFC/PATCH] Make powerpc64 use __thread for per-cpu variables
Date: Tue, 09 May 2006 23:39:58 -0700 (PDT) [thread overview]
Message-ID: <20060509.233958.73723993.davem@davemloft.net> (raw)
In-Reply-To: <17505.34919.750295.170941@cargo.ozlabs.ibm.com>
From: Paul Mackerras <paulus@samba.org>
Date: Wed, 10 May 2006 16:29:59 +1000
> I have moved current, smp_processor_id and a couple of other things to
> per-cpu variables, and that results in the kernel text being about 8k
> smaller than without any of these __thread patches. Performance seems
> to be very slightly better but it's hard to be sure that the change is
> statistically significant, from the measurements I've done so far.
That first cache line of current_thread_info() should be so hot that
it's probably just fine to use current_thread_info()->task since
you're just doing a mask on a fixed register (r1) to implement that.
next prev parent reply other threads:[~2006-05-10 6:40 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-10 4:03 [RFC/PATCH] Make powerpc64 use __thread for per-cpu variables Paul Mackerras
2006-05-10 5:16 ` Olof Johansson
2006-05-10 5:35 ` Alan Modra
2006-05-10 6:22 ` David S. Miller
2006-05-10 6:29 ` Paul Mackerras
2006-05-10 6:39 ` David S. Miller [this message]
2006-05-10 7:21 ` Benjamin Herrenschmidt
2006-05-10 7:41 ` Paul Mackerras
2006-05-10 10:14 ` David Howells
2006-05-10 15:47 ` Richard Henderson
2006-05-10 18:04 ` Steven Rostedt
2006-05-10 19:40 ` David S. Miller
2006-05-10 21:05 ` Paul Mackerras
2006-05-10 22:25 ` David S. Miller
2006-05-10 23:17 ` Segher Boessenkool
2006-05-11 0:22 ` Richard Henderson
2006-05-11 23:41 ` Segher Boessenkool
2006-05-11 1:04 ` Alan Modra
2006-05-11 1:21 ` Paul Mackerras
2006-05-11 2:01 ` Alan Modra
2006-05-11 23:42 ` Segher Boessenkool
2006-05-10 23:05 ` Paul Mackerras
2006-05-10 23:44 ` Paul Mackerras
2006-05-11 0:11 ` David S. Miller
2006-05-18 23:50 ` Paul Mackerras
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