From: Pavel Machek <pavel@ucw.cz>
To: Andi Kleen <ak@muc.de>
Cc: "Tomar, Nagendra" <nagendra_tomar@adaptec.com>,
linux-kernel@vger.kernel.org
Subject: Re: why change_page_attr on x86 uses __flush_tlb_all
Date: Tue, 20 Apr 2004 15:03:53 +0200 [thread overview]
Message-ID: <20040420130353.GC831@openzaurus.ucw.cz> (raw)
In-Reply-To: <m3smf5ic38.fsf@averell.firstfloor.org>
Hi!
> > I would expect __flush_tlb_one (for each page) as a better choice.
> > It'll be nice if someone can hoghlight on why __flush_tlb_all is used.
> > The kernel version I am referring from is 2.4.18-14
>
> This works around a bug in some early Athlons with flushing global
> large pages. Also it makes the code slightly simpler and change_page_attr
> is not really performance critical.
Perhaps comment should be added? Otherwise someone is going
to "fix" it sooner or later.
--
64 bytes from 195.113.31.123: icmp_seq=28 ttl=51 time=448769.1 ms
next prev parent reply other threads:[~2004-04-22 19:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1Lek1-5lB-3@gated-at.bofh.it>
2004-04-15 13:51 ` why change_page_attr on x86 uses __flush_tlb_all Andi Kleen
2004-04-20 13:03 ` Pavel Machek [this message]
2004-04-15 12:32 Nagendra Singh Tomar
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