linux-kernel - Re: [PATCH] Add per-process flag to control thp

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Message-ID: <20130802195335.GA23255@redhat.com>
Date:	Fri, 2 Aug 2013 15:53:35 -0400
From:	Dave Jones <davej@...hat.com>
To:	Alex Thorlton <athorlton@....com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Sedat Dilek <sedat.dilek@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Al Viro <viro@...iv.linux.org.uk>,
	Oleg Nesterov <oleg@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Kees Cook <keescook@...omium.org>, Robin Holt <holt@....com>
Subject: Re: [PATCH] Add per-process flag to control thp

On Fri, Aug 02, 2013 at 02:46:59PM -0500, Alex Thorlton wrote:

 > diff --git a/include/linux/sched.h b/include/linux/sched.h
 > index 50d04b9..f084c76 100644
 > --- a/include/linux/sched.h
 > +++ b/include/linux/sched.h
 > @@ -1406,6 +1406,9 @@ struct task_struct {
 >  	unsigned int	sequential_io;
 >  	unsigned int	sequential_io_avg;
 >  #endif
 > +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 > +	int thp_disabled;
 > +#endif
 >  };

Instead of blowing a whole int on this bool, we could add it
to the bitfield a few pages up where we have other prctl things like..

	unsigned no_new_privs:1;

	Dave

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