From: Nick Piggin <nickpiggin@yahoo.com.au>
To: "liyu@WAN" <liyu@ccoss.com.cn>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: [Question] Can we release vma that include code when one process is running?
Date: Thu, 15 Sep 2005 22:46:21 +1000 [thread overview]
Message-ID: <43296D1D.4000407@yahoo.com.au> (raw)
In-Reply-To: <432919C3.7060708@ccoss.com.cn>
liyu@WAN wrote:
> It seem that code in other place jump here to enter kernel. this is
> in a anonymous
> code area.
> At first time, I think this SIGSEGV will trigger by anonymous code
> that is swapped,
> but I wrote one specical condition check to filte out this sort of code,
> IOW, I do
> not swap out it. but I still get SIGSEGV.
>
> May be, we can not be release the vma that include code? or, Is there
> have some errors
> in my words for page fault?
>
That's right, you cannot release the VMA if the application still
expects to use memory in that area. The page fault handler will
see that no VMA exists in that region and raise a SIGSEGV.
See arch/i386/mm/fault.c:do_page_fault
Nick
--
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com
next prev parent reply other threads:[~2005-09-15 12:46 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-15 6:50 [Question] Can we release vma that include code when one process is running? liyu@WAN
2005-09-15 12:46 ` Nick Piggin [this message]
2005-09-16 8:02 ` liyu@WAN
2005-09-18 8:15 ` Nick Piggin
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