Re: [PATCH 12/12] vmscan: Do not writeback pages in direct reclaim

[Christoph Hellwig]

On Wed, Jun 16, 2010 at 09:39:58AM +0900, KAMEZAWA Hiroyuki wrote:
> Hmm. But I don't expect copy_from/to_user is called in very deep stack.

Actually it is.  The poll code mentioned earlier in this thread is just
want nasty example.  I'm pretty sure there are tons of others in ioctl
code, as various ioctl implementations have been found to be massive
stack hogs in the past, even worse for out of tree drivers.

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