From: Andrea Arcangeli <aarcange@redhat.com>
To: Izik Eidus <ieidus@redhat.com>
Cc: linux-kernel@vger.kernel.org, Rik van Riel <riel@redhat.com>,
Hugh Dickins <hugh.dickins@tiscali.co.uk>,
nickpiggin@yahoo.com.au
Subject: Re: running get_user_pages() from kernel thread
Date: Tue, 16 Jun 2009 20:13:26 +0200 [thread overview]
Message-ID: <20090616181325.GC23969@random.random> (raw)
In-Reply-To: <4A37DEE7.1000208@redhat.com>
On Tue, Jun 16, 2009 at 09:05:27PM +0300, Izik Eidus wrote:
> So the question is: is this thing is by desgin? (that kernel thread cant
> call get_user_pages???), should i use something like switch_mm()??
I think switch_mm trick should be used for page faults, but gup
shouldn't require it because it gets the 'mm' as parameter and the
current->mm has to be irrelevant. current->mm is only relevant for
gup-fast (obviously :). So I think the only bit that needs fixing is
grab_swap_token to not run if current->mm is null.
next prev parent reply other threads:[~2009-06-16 18:13 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-16 18:05 running get_user_pages() from kernel thread Izik Eidus
2009-06-16 18:13 ` Andrea Arcangeli [this message]
2009-06-16 18:38 ` Hugh Dickins
2009-06-16 18:55 ` Rik van Riel
2009-06-16 19:45 ` Hugh Dickins
2009-06-16 20:38 ` Andrea Arcangeli
2009-06-16 21:02 ` Hugh Dickins
2009-06-16 21:19 ` Rik van Riel
2009-06-16 19:20 ` Izik Eidus
2009-06-16 20:45 ` Hugh Dickins
2009-06-16 21:25 ` Izik Eidus
2009-06-16 20:08 ` Johannes Weiner
2009-06-16 20:57 ` Hugh Dickins
2009-06-16 21:50 ` [patch 1/2] mm: make swap token dummies static inlines Johannes Weiner
2009-06-16 21:50 ` Johannes Weiner
2009-06-16 21:55 ` Rik van Riel
2009-06-16 21:55 ` Rik van Riel
2009-06-16 21:50 ` [patch 2/2] mm: remove task assumptions from swap token Johannes Weiner
2009-06-16 21:50 ` Johannes Weiner
2009-06-16 21:56 ` Rik van Riel
2009-06-16 21:56 ` Rik van Riel
2009-06-17 2:00 ` Minchan Kim
2009-06-17 2:00 ` Minchan Kim
2009-06-17 8:31 ` Johannes Weiner
2009-06-17 8:31 ` Johannes Weiner
2009-06-16 21:52 ` running get_user_pages() from kernel thread Johannes Weiner
2009-06-21 13:02 ` [PATCH] mm: pass mm to grab_swap_token Hugh Dickins
2009-06-22 0:32 ` Minchan Kim
2009-06-16 21:16 ` running get_user_pages() from kernel thread Rik van Riel
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