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From: Stefan Hoffmeister <lkml.2001@econos.de>
To: Rik van Riel <riel@conectiva.com.br>
Cc: John Stoffel <stoffel@casc.com>,
	Jason McMullan <jmcmullan@linuxcare.com>,
	<linux-kernel@vger.kernel.org>
Subject: Re: VM Requirement Document - v0.0
Date: Wed, 27 Jun 2001 00:21:09 +0200	[thread overview]
Message-ID: <qn1ijt06guu1014p6om26opk7k5933kb7i@4ax.com> (raw)
In-Reply-To: <15160.65442.682067.38776@gargle.gargle.HOWL> <Pine.LNX.4.33L.0106261838320.23373-100000@duckman.distro.conectiva>
In-Reply-To: <Pine.LNX.4.33L.0106261838320.23373-100000@duckman.distro.conectiva>

: On Tue, 26 Jun 2001 18:42:56 -0300 (BRST), Rik van Riel wrote:

>On Tue, 26 Jun 2001, John Stoffel wrote:
>
>> Or that we're doing big sequential reads of file(s) which are
>> larger than memory, in which case expanding the cache size buys
>> us nothing, and can actually hurt us alot.
>
>That's a big "OR".  I think we should have an algorithm to
>see which of these two is the case, otherwise we're just
>making the wrong decision half of the time.

Windows NT/2000 has flags that can be for each CreateFile operation
("open" in Unix terms), for instance

  FILE_ATTRIBUTE_TEMPORARY

  FILE_FLAG_WRITE_THROUGH
  FILE_FLAG_NO_BUFFERING
  FILE_FLAG_RANDOM_ACCESS
  FILE_FLAG_SEQUENTIAL_SCAN

If Linux does not have mechanism that would allow the signalling of
specific use case, it might be helpful to implement such a hinting system?

Disclaimer: I am clueless about what the kernel provides at this time.

  reply	other threads:[~2001-06-26 22:23 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-06-26 19:58 VM Requirement Document - v0.0 Jason McMullan
2001-06-26 21:21 ` Rik van Riel
2001-06-26 21:29   ` Jason McMullan
2001-06-26 21:33 ` John Stoffel
2001-06-26 21:42   ` Rik van Riel
2001-06-26 22:21     ` Stefan Hoffmeister [this message]
2001-06-26 22:48       ` Jeffrey W. Baker
2001-06-27  0:18         ` Mike Castle
2001-06-28 13:07       ` John Fremlin
2001-06-27 13:36     ` Marco Colombo
2001-06-27  3:55   ` Daniel Phillips
2001-06-27 14:09   ` Pozsar Balazs
2001-06-28 22:47 ` John Fremlin
2001-06-30 15:37 ` Pavel Machek
2001-07-10 10:34 ` David Woodhouse
2001-06-27  8:53 Martin Knoblauch
2001-06-27 18:13 ` Rik van Riel
2001-06-28  6:59   ` Martin Knoblauch
2001-06-28 11:27 ` Helge Hafting
2001-06-28 11:54   ` Martin Knoblauch
2001-06-28 12:02   ` Tobias Ringstrom
2001-06-28 12:31     ` Xavier Bestel
2001-06-28 13:05       ` Tobias Ringstrom
     [not found] <fa.oqkojpv.3hosb7@ifi.uio.no>
     [not found] ` <fa.jpsks3v.1o2gag4@ifi.uio.no>
2001-06-27  0:43   ` Dan Maas
2001-06-27  0:45     ` Mike Castle
2001-06-27 10:50   ` Xavier Bestel
2001-06-28 12:20 mike_phillips
2001-06-28 12:30 ` Alan Cox
2001-06-28 13:33   ` Tobias Ringstrom
2001-06-28 13:37     ` Alan Cox
2001-06-28 14:04       ` Tobias Ringstrom
2001-06-28 14:14         ` Alan Cox
2001-06-28 14:52       ` Daniel Phillips
2001-06-28 14:39 ` Daniel Phillips
2001-06-28 18:01   ` Marco Colombo
2001-07-02 18:42     ` Rik van Riel
2001-07-03 10:33       ` Marco Colombo
2001-07-03 15:04         ` Daniel Phillips
2001-07-03 18:24           ` Daniel Phillips
2001-07-04  8:12           ` Ari Heitner
2001-07-04  9:41           ` Marco Colombo
2001-07-04 15:03             ` Daniel Phillips
2001-07-03 18:29       ` Daniel Phillips
2001-07-04  8:32         ` Marco Colombo
2001-07-04 14:44           ` Daniel Phillips
2001-06-28 15:21 ` Jonathan Morton
2001-06-28 16:02   ` Daniel Phillips
2001-07-04 16:08 mike_phillips
2001-07-05 15:04 Daniel Phillips
     [not found] ` <fa.jprli0v.qlofoc@ifi.uio.no>
     [not found]   ` <fa.e66agbv.hn0u1v@ifi.uio.no>
2001-07-05  1:49     ` Dan Maas
2001-07-05 13:02       ` Daniel Phillips
2001-07-05 14:00       ` Xavier Bestel
2001-07-05 14:51         ` Daniel Phillips
2001-07-05 15:00         ` Xavier Bestel
2001-07-05 15:12           ` Daniel Phillips
2001-07-05 15:12         ` Alan Shutko
     [not found]     ` <002501c104f4/mnt/sendme701a8c0@morph>
2001-07-09 12:17       ` Pavel Machek
2001-07-12 23:46         ` Daniel Phillips
2001-07-13 21:07           ` Pavel Machek
2001-07-06 19:09 ` Rik van Riel
2001-07-06 21:57   ` Daniel Phillips
2001-07-05 15:09 mike_phillips

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