From: Andrew Morton <akpm@linux-foundation.org>
To: Rik van Riel <riel@redhat.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: userspace pagecache management tool
Date: Sat, 3 Mar 2007 13:12:04 -0800 [thread overview]
Message-ID: <20070303131204.6706a95c.akpm@linux-foundation.org> (raw)
In-Reply-To: <45E9DD4A.2060806@redhat.com>
On Sat, 03 Mar 2007 15:40:42 -0500 Rik van Riel <riel@redhat.com> wrote:
> Andrew Morton wrote:
>
> > It is to address the "waah, backups fill my memory with pagecache" and the
> > "waah, updatedb swapped everything out" and the "waah, copying a DVD
> > gobbled all my memory" problems.
>
> By removing pressure from the page cache, you'll only allow updatedb
> to grow the inode and dentry caches larger than before.
Well duh.
That's a two-order-of-magnitude lesser problem and only affects one of many
problematic workloads.
> I am sick and tired of the "this is hard, let userspace do it" attitude.
Anything you try to do in-kernel will catastrophically screw up some
workloads. You don't have a chance of getting this right.
You are the kernel. The user just read an entire kernel tree. You face a
binary decision: do you cache that tree or do you not? Your time starts
now. What is your answer?
next prev parent reply other threads:[~2007-03-03 21:12 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-03 20:29 Andrew Morton
2007-03-03 20:40 ` Rik van Riel
2007-03-03 21:12 ` Andrew Morton [this message]
2007-03-03 21:30 ` Rik van Riel
2007-03-03 21:41 ` bert hubert
2007-03-03 22:14 ` Andrew Morton
2007-03-03 22:19 ` Rik van Riel
2007-03-03 22:26 ` Andrew Morton
2007-03-03 22:28 ` Rik van Riel
2007-03-03 22:38 ` Andrew Morton
2007-03-03 22:56 ` Erik Andersen
2007-03-03 23:01 ` bert hubert
2007-03-03 23:45 ` Andrew Morton
2007-03-06 12:10 ` Pádraig Brady
2007-03-06 21:40 ` Andrew Morton
2007-03-06 21:44 ` Rik van Riel
2007-03-07 11:39 ` Pádraig Brady
2007-03-07 18:50 ` Andrew Morton
2007-03-08 7:59 ` Vaidyanathan Srinivasan
2007-03-08 8:12 ` Andrew Morton
2007-03-03 22:07 ` Andrew Morton
2007-03-03 22:25 ` Rik van Riel
2007-03-03 22:37 ` Andrew Morton
2007-03-03 22:52 ` Andrew Morton
2007-03-04 0:01 ` Rik van Riel
2007-03-04 1:02 ` Andrew Morton
2007-03-04 1:23 ` Rik van Riel
2007-03-04 1:49 ` Andrew Morton
2007-03-04 1:56 ` Rik van Riel
2007-03-04 12:07 ` Andrew Morton
2007-03-04 14:35 ` Peter Zijlstra
2007-03-04 16:01 ` Rik van Riel
2007-03-03 22:58 ` Ray Lee
2007-03-03 23:34 ` Andrew Morton
2007-03-04 1:02 ` Ray Lee
2007-03-04 1:21 ` Andrew Morton
2007-03-04 0:14 ` Eric St-Laurent
2007-03-04 1:10 ` Andrew Morton
2007-03-04 1:39 ` Rik van Riel
2007-03-04 1:16 ` Lee Revell
2007-03-04 1:39 ` Andrew Morton
2007-03-04 2:35 ` Lee Revell
2007-03-04 4:35 ` Andrew Morton
2007-03-05 11:02 ` Pádraig Brady
2007-03-05 11:12 ` Andrew Morton
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