linux-kernel - Re: [RFC][PATCH 4/5] memory_pressure

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Message-ID: <20080115175925.215471e1@bree.surriel.com>
Date:	Tue, 15 Jan 2008 17:59:25 -0500
From:	Rik van Riel <riel@...hat.com>
To:	"Daniel Spång" <daniel.spang@...il.com>
Cc:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	"Marcelo Tosatti" <marcelo@...ck.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH 4/5] memory_pressure_notify() caller

On Tue, 15 Jan 2008 23:55:17 +0100
"Daniel Spång" <daniel.spang@...il.com> wrote:

> The notification fires after only ~100 MB allocated, i.e., when page
> reclaim is beginning to nag from page cache. Isn't this a bit early?
> Repeating the test with swap enabled results in a notification after
> ~600 MB allocated, which is more reasonable and just before the system
> starts to swap.

Your issue may have more to do with the fact that the
highmem zone is 128MB in size and some balancing issues
between __alloc_pages and try_to_free_pages.

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