From: "Stephen C. Tweedie" <sct@redhat.com>
To: Chuck Lever <cel@monkey.org>
Cc: Andrea Arcangeli <andrea@e-mind.com>,
"Stephen C. Tweedie" <sct@redhat.com>,
linux-kernel@vger.rutgers.edu, linux-mm@kvack.org
Subject: Re: [patch] arca-vm-2.2.5
Date: Tue, 6 Apr 1999 22:11:22 +0100 (BST) [thread overview]
Message-ID: <14090.30842.367364.230774@dukat.scot.redhat.com> (raw)
In-Reply-To: <Pine.BSF.4.03.9904061644370.3406-100000@funky.monkey.org>
Hi,
On Tue, 6 Apr 1999 16:47:23 -0400 (EDT), Chuck Lever <cel@monkey.org>
said:
>> but I was just assuming that the offset is always page-aligned.
>> I could write a simulation to check the hash function...
> i didn't realize that the "offset" argument would always be page-aligned.
> but still, why does it help to add the unshifted "offset"? doesn't seem
> like there's any new information in that.
It is always aligned for the page cache (hence mixing in the lower bits
to the hash function shouldn't change anything), but the swap cache uses
the lower bits extensively, concentrating the swap cache into just a few
hash buckets unless we make this change.
--Stephen
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next prev parent reply other threads:[~1999-04-06 21:11 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-04-01 23:32 Andrea Arcangeli
1999-04-04 21:07 ` Chuck Lever
1999-04-05 0:22 ` Andrea Arcangeli
1999-04-05 13:23 ` Mark Hemment
1999-04-05 15:56 ` Andrea Arcangeli
1999-04-07 11:28 ` [patch] only-one-cache-query [was Re: [patch] arca-vm-2.2.5] Andrea Arcangeli
1999-04-07 13:06 ` Stephen C. Tweedie
1999-04-07 13:49 ` Andrea Arcangeli
1999-04-07 13:42 ` Andrea Arcangeli
1999-04-07 13:47 ` Ingo Molnar
1999-04-07 14:08 ` Andrea Arcangeli
1999-04-05 20:24 ` [patch] arca-vm-2.2.5 Horst von Brand
1999-04-05 23:25 ` Andrea Arcangeli
1999-04-05 23:37 ` Horst von Brand
1999-04-06 1:23 ` Andrea Arcangeli
1999-04-17 11:12 ` Andrea Arcangeli
1999-04-05 21:31 ` Chuck Lever
1999-04-06 0:15 ` Andrea Arcangeli
1999-04-06 2:14 ` Doug Ledford
1999-04-06 13:04 ` Andrea Arcangeli
1999-04-06 21:31 ` Stephen C. Tweedie
1999-04-06 22:27 ` Andrea Arcangeli
1999-04-07 12:27 ` Stephen C. Tweedie
1999-04-25 3:22 ` Chuck Lever
1999-04-06 5:52 ` Chuck Lever
1999-04-06 13:09 ` Andrea Arcangeli
1999-04-06 16:19 ` Eric W. Biederman
1999-04-06 20:26 ` Andrea Arcangeli
1999-04-07 5:00 ` Eric W. Biederman
1999-04-07 11:36 ` Andrea Arcangeli
1999-04-06 14:02 ` Stephen C. Tweedie
1999-04-06 15:38 ` Chuck Lever
1999-04-06 17:16 ` Andrea Arcangeli
1999-04-06 18:07 ` Andrea Arcangeli
1999-04-06 21:22 ` Stephen C. Tweedie
1999-04-06 22:19 ` Ingo Molnar
1999-04-06 22:40 ` David Miller
1999-04-06 22:49 ` Ingo Molnar
1999-04-06 22:53 ` David Miller
1999-04-07 15:59 ` Gabriel Paubert
1999-04-07 21:07 ` Arvind Sankar
1999-04-09 6:58 ` Eric W. Biederman
1999-04-09 9:27 ` Gabriel Paubert
1999-04-09 15:40 ` Eric W. Biederman
1999-04-08 8:09 ` Carlo Daffara
1999-04-06 22:31 ` Andrea Arcangeli
1999-04-06 20:47 ` Chuck Lever
1999-04-06 21:04 ` Andrea Arcangeli
1999-04-06 21:11 ` Stephen C. Tweedie [this message]
1999-04-06 14:00 ` Stephen C. Tweedie
1999-04-06 16:29 ` Andrea Arcangeli
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