From: William Lee Irwin III <wli@holomorphy.com>
To: Chris Friesen <cfriesen@nortelnetworks.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: question on memory map cleanup stuff
Date: Mon, 18 Oct 2004 16:14:32 -0700 [thread overview]
Message-ID: <20041018231432.GI5607@holomorphy.com> (raw)
In-Reply-To: <41744A50.3030700@nortelnetworks.com>
On Mon, Oct 18, 2004 at 04:57:20PM -0600, Chris Friesen wrote:
> I've got a small feature that maps a page of kernel memory to userspace via
> a syscall, then uses that page for various things.
> Currently, I'm marking the page reserved, then exporting it via
> remap_page_range(). This means that I need to clean up my mapping whenever
> the memory map is destroyed (process death, exec(), daemonize, etc.).
> It appears that I should be able to put my cleanup code in exit_mmap().
> Since the cleanup code calls do_munmap() on the address, I would want to
> call it before taking mm->page_table_lock, correct?
> Also, normally I would hold mm->mmap_sem before calling do_munmap(). Would
> I still need this if I'm calling it from exit_mmap()? Presumably nobody
> else can get at it anymore...
vma->vm_ops->close() often suffices for such without disturbing the core.
-- wli
next prev parent reply other threads:[~2004-10-18 23:14 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-18 22:57 question on memory map cleanup stuff Chris Friesen
2004-10-18 23:14 ` William Lee Irwin III [this message]
2004-10-18 23:39 ` Chris Friesen
2004-10-19 18:19 ` Chris Friesen
2004-10-19 18:24 ` William Lee Irwin III
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