From: jeff shia <tshxiayu@gmail.com>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: what is the state of current after an mm_fault occurs?
Date: Thu, 5 Jan 2006 11:20:49 +0800 [thread overview]
Message-ID: <7cd5d4b40601041920u596551d2h75e167311e9452e4@mail.gmail.com> (raw)
In-Reply-To: <20060104174808.7b882af8.akpm@osdl.org>
en,
You mean in some pagefault place we do schedule()?
Where?
Thank you !
On 1/5/06, Andrew Morton <akpm@osdl.org> wrote:
> jeff shia <tshxiayu@gmail.com> wrote:
> >
> > In my opinion, the state of current should be TASK_RUNNING
> > after an mm_fault occurs.But I donot know why the function of
> > handle_mm_fault() set the state of current TASK_RUNNING.
>
> It was a long time ago.. 2.4.early, perhaps.
>
> There was a place (maybe in the select() code) where we were doing
> copy_*_user() while in state TASK_INTERRUPTIBLE. And iirc there was a
> place in the pagefault code which did schedule(). So we would occasionally
> hit schedule() in state TASK_INTERRUPTIBLE, when we expected to be in state
> TASK_RUNNING.
>
> So we made handle_mm_fault() set TASK_RUNNING to prevent any further such
> things.
>
>
next prev parent reply other threads:[~2006-01-05 3:20 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-04 10:40 jeff shia
2006-01-05 1:48 ` Andrew Morton
2006-01-05 3:20 ` jeff shia [this message]
2006-01-05 3:23 ` Andrew Morton
2006-01-05 20:30 ` Christoph Lameter
2006-01-05 23:18 ` Andrew Morton
2006-01-05 21:17 ` Ram Gupta
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