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Message-ID: <3E6650D4.8060809@redhat.com>
Date: Wed, 05 Mar 2003 11:32:36 -0800
From: Ulrich Drepper <drepper@redhat.com>
Organization: Red Hat, Inc.
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To: Andi Kleen <ak@suse.de>
CC: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: Better CLONE_SETTLS support for Hammer
References: <3E664836.7040405@redhat.com> <20030305190622.GA5400@wotan.suse.de>
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Andi Kleen wrote:

> If you just want to save one mmap/allocation: I think the context switch
> overhead will be more expensive than the allocation.

And two more things:

1. every process will already use the prctl(ARCH_SET_FS).  We are
talking here only about the 2nd thread and later.  We need to use
prctl(ARCH_SET_FS) for TLS support.


2. May I remind you that you were in the crowd who complained when we
requested a dedicated thread register?  Yes, I still would prefer that
but I have no energy to battle for that.

- -- 
- --------------.                        ,-.            444 Castro Street
Ulrich Drepper \    ,-----------------'   \ Mountain View, CA 94041 USA
Red Hat         `--' drepper at redhat.com `---------------------------
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