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Date: Mon, 20 Sep 2010 12:14:46 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Peter Zijlstra <a.p.zijlstra@...llo.nl> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>, Tejun Heo <tj@...nel.org>, Avi Kivity <avi@...hat.com> Subject: Re: [RFC][PATCH 2/2] kernel: extract thread types from task_struct::flags On Mon, 20 Sep 2010 17:13:36 +0200 Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote: > Free up a few more PF_flags by moving thread types out to their own variable. > > Initially I compressed the types into less bits inside task_struct::flags, but > Thomas suggested I move them to their own field. > There doesn't seem to be a huge point to all this, but I guess there's some sense in separating "what type of thread this is" from "attributes of this thread". Maybe. At the expense of a larger task_struct. > +/* > + * Types >= tt_kernel imply the old PF_KTHREAD > + */ Perhaps that should be encapsulated into another helper function > --- linux-2.6.orig/kernel/fork.c > +++ linux-2.6/kernel/fork.c > @@ -570,7 +570,7 @@ struct mm_struct *get_task_mm(struct tas > task_lock(task); > mm = task->mm; > if (mm) { > - if (task->flags & PF_KTHREAD) > + if (task_type(task) >= tt_kernel) rather than open-coded everywhere. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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