From: Willy Tarreau <willy@w.ods.org>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Al Boldi <a1426z@gawab.com>, Willy Tarreau <willy@w.ods.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
barryn@pobox.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] strict VM overcommit accounting for 2.4.32/2.4.33-pre1
Date: Sat, 31 Dec 2005 15:58:22 +0100 [thread overview]
Message-ID: <20051231145822.GB15993@alpha.home.local> (raw)
In-Reply-To: <1136039178.2901.25.camel@laptopd505.fenrus.org>
On Sat, Dec 31, 2005 at 03:26:18PM +0100, Arjan van de Ven wrote:
> On Sat, 2005-12-31 at 17:02 +0300, Al Boldi wrote:
>
> > Shouldn't it be possible to disable overcommit completely, thus giving kswapd
> > a break from running wild trying to find something to swap/page, which is
> > the reason why the system gets unstable going over 95% in your example.
>
> shared mappings make this impractical. To disable overcommit completely,
> each process would need to account for all its own shared libraries, eg
> each process gets glibc added etc. You'll find that on any
> non-extremely-stripped system you then end up with much more memory
> needed than you have ram.
Arjan, is this true even for read-only mappings such as shared libs ?
It seems to me that those ones can precisely be mapped once because
they are areas the process cannot extend. Am I wrong ?
Willy
next prev parent reply other threads:[~2005-12-31 15:01 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-30 20:06 Al Boldi
2005-12-30 20:18 ` Barry K. Nathan
2005-12-30 20:51 ` Al Boldi
2005-12-30 21:44 ` Willy TARREAU
2005-12-31 0:55 ` Alan Cox
2005-12-31 4:59 ` Al Boldi
2005-12-31 7:38 ` Willy Tarreau
2005-12-31 14:02 ` Al Boldi
2005-12-31 14:18 ` Willy Tarreau
2005-12-31 14:26 ` Arjan van de Ven
2005-12-31 14:58 ` Willy Tarreau [this message]
2005-12-31 15:17 ` Arjan van de Ven
2005-12-31 17:36 ` Al Boldi
2006-01-01 9:12 ` Arjan van de Ven
-- strict thread matches above, loose matches on Subject: below --
2005-12-30 7:44 Barry K. Nathan
2005-12-30 17:48 ` Willy Tarreau
2005-12-30 18:17 ` Arjan van de Ven
2005-12-30 18:33 ` Willy Tarreau
2005-12-30 19:37 ` Barry K. Nathan
2005-12-30 20:45 ` Willy Tarreau
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