linux-kernel - Re: [00/41] Large Blocksize Support V7 (adds memmap support)

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Date:	Mon, 24 Sep 2007 17:39:46 +0200
From:	Andrea Arcangeli <andrea@...e.de>
To:	Goswin von Brederlow <brederlo@...ormatik.uni-tuebingen.de>
Cc:	Mel Gorman <mel@...net.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joern Engel <joern@...fs.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Christoph Lameter <clameter@....com>,
	torvalds@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
	William Lee Irwin III <wli@...omorphy.com>,
	David Chinner <dgc@....com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Badari Pulavarty <pbadari@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Fengguang Wu <fengguang.wu@...il.com>,
	swin wang <wangswin@...il.com>, totty.lu@...il.com,
	hugh@...itas.com
Subject: Re: [00/41] Large Blocksize Support V7 (adds memmap support)

On Sun, Sep 23, 2007 at 08:56:39AM +0200, Goswin von Brederlow wrote:
> As a user I know it because I didn't put a kernel source into /tmp. A
> programm can't reasonably know that.

Various apps requires you (admin/user) to tune the size of their
caches. Seems like you never tried to setup a database, oh well.

> Xen has its own memory pool and can quite agressively reclaim memory
> from dom0 when needed. I just ment to say that the number in

The whole point is if there's not enough ram of course... this is why
you should check.

> /proc/meminfo can change in a second so it is not much use knowing
> what it said last minute.

The numbers will change depending on what's running on your
system. It's up to you to know plus I normally keep vmstat monitored
in the background to see how the cache/free levels change over
time. Those numbers are worthless if they could be fragmented...

> I would kill any programm that does that to find out how much free ram
> the system has.

The admin should do that if he's unsure, not a program of course!
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