From: "Andi Kleen" <ak@suse.de>
To: "Stephen C. Tweedie" <sct@redhat.com>
Cc: lord@sgi.com, "Benjamin C.R. LaHaise" <blah@kvack.org>,
David Woodhouse <dwmw2@infradead.org>,
linux-kernel@vger.rutgers.edu, linux-mm@kvack.org
Subject: Re: kmap_kiobuf()
Date: Wed, 28 Jun 2000 23:05:17 +0200 [thread overview]
Message-ID: <20000628230517.A14031@gruyere.muc.suse.de> (raw)
In-Reply-To: <20000628190612.E2392@redhat.com>; from sct@redhat.com on Wed, Jun 28, 2000 at 07:06:12PM +0100
On Wed, Jun 28, 2000 at 07:06:12PM +0100, Stephen C. Tweedie wrote:
> Hi,
>
> On Wed, Jun 28, 2000 at 11:52:40AM -0500, lord@sgi.com wrote:
> >
> > I am not a VM guy either, Ben, is the cost of the TLB flush mostly in
> > the synchronization between CPUs, or is it just expensive anyway you
> > look at it?
>
> The TLB IPI is by far the biggest factor here.
In theory it would be possible to do it lazily associated with the object's
lock (so that the TLB is only transfered when some other CPU aquires the lock of the
object in question). It would be probably rather error prone though.
-Andi
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next prev parent reply other threads:[~2000-06-28 21:05 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-06-28 16:52 kmap_kiobuf() lord
2000-06-28 18:06 ` kmap_kiobuf() Stephen C. Tweedie
2000-06-28 19:06 ` kmap_kiobuf() Manfred Spraul
2000-06-28 21:05 ` Andi Kleen [this message]
-- strict thread matches above, loose matches on Subject: below --
2000-06-28 20:16 kmap_kiobuf() lord
2000-06-28 21:22 ` kmap_kiobuf() Benjamin C.R. LaHaise
2000-06-29 9:34 ` kmap_kiobuf() Stephen C. Tweedie
2000-06-29 13:45 ` kmap_kiobuf() Steve Lord
2000-06-28 15:54 kmap_kiobuf() lord
2000-06-28 16:06 ` kmap_kiobuf() David Woodhouse
2000-06-28 16:24 ` kmap_kiobuf() Benjamin C.R. LaHaise
2000-06-28 18:07 ` kmap_kiobuf() Stephen C. Tweedie
2000-06-28 18:45 ` kmap_kiobuf() David Woodhouse
2000-06-29 9:09 ` kmap_kiobuf() Stephen C. Tweedie
2000-06-28 17:46 ` kmap_kiobuf() Stephen C. Tweedie
2000-06-28 15:41 kmap_kiobuf() David Woodhouse
2000-06-28 17:44 ` kmap_kiobuf() Stephen C. Tweedie
2000-06-29 10:52 ` kmap_kiobuf() Stephen C. Tweedie
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