From: Oleg Drokin <green@namesys.com>
To: Andrew Morton <akpm@digeo.com>
Cc: Alex Tomas <bzzz@tmi.comex.ru>, linux-kernel@vger.kernel.org
Subject: Re: [RFC] vmtruncate releases pages of MAP_PRIVATE vma
Date: Wed, 22 Jan 2003 10:32:43 +0300 [thread overview]
Message-ID: <20030122103243.A1750@namesys.com> (raw)
In-Reply-To: <3E2DA4A5.C5C17138@digeo.com>
Hello!
On Tue, Jan 21, 2003 at 11:51:01AM -0800, Andrew Morton wrote:
> > I think vmtruncate() should preserve that pages.
> That would make sense. But we'd have to go and create zillions
> of copies of pages inside truncate, and given that the behaviour
> is unspecified, it is questionable whether anyone should be
> relying on the behaviour anyway..
It is way too easy to truncate some library and all executables (that are loaded
right now) will go nuts (Just did echo >/lib/libncurses.so.5.2 and expected
everything will get SIGBUS, but all the bashes and mutt went crazy consuming
memory until oom-killer killed them. Kind of surprising behaviour, I'd say.
Test was done on 2.4.19).
Also *BSD systems seems to return -ETXTBSY not only when you try to write-open
running executables, but also all of shared libs used (and this is probably
even more logical ).
Bye,
Oleg
prev parent reply other threads:[~2003-01-22 7:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-21 19:26 [RFC] vmtruncate releases pages of MAP_PRIVATE vma Alex Tomas
2003-01-21 19:51 ` Andrew Morton
2003-01-22 7:32 ` Oleg Drokin [this message]
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