From: Oleg Nesterov <oleg@redhat.com>
To: Alex Thorlton <athorlton@sgi.com>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Rik van Riel <riel@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Sedat Dilek <sedat.dilek@gmail.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Dave Jones <davej@redhat.com>,
Michael Kerrisk <mtk.manpages@gmail.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
David Howells <dhowells@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Al Viro <viro@zeniv.linux.org.uk>,
Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
Kees Cook <keescook@chromium.org>, Robin Holt <holt@sgi.com>
Subject: Re: [PATCHv2] Add per-process flag to control thp
Date: Sat, 3 Aug 2013 19:01:02 +0200 [thread overview]
Message-ID: <20130803170102.GD32568@redhat.com> (raw)
In-Reply-To: <20130802205735.GS26476@sgi.com>
On 08/02, Alex Thorlton wrote:
>
> This patch implements functionality to allow processes to disable the use of
> transparent hugepages through the prctl syscall.
>
> We've determined that some jobs perform significantly better with thp disabled,
> and we needed a way to control thp on a per-process basis, without relying on
> madvise.
Well, I think the changelog should explain why madvise() is bad.
> @@ -1311,6 +1311,10 @@ static struct task_struct *copy_process(unsigned long clone_flags,
> p->sequential_io_avg = 0;
> #endif
>
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> + p->thp_disabled = current->thp_disabled;
> +#endif
Unneeded. It will be copied by dup_task_struct() automagically.
But I simply can't understand why this flag is per-thread. It should be
mm flag, no?
Oleg
next prev parent reply other threads:[~2013-08-03 17:07 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-02 20:57 [PATCHv2] Add per-process flag to control thp Alex Thorlton
2013-08-03 17:01 ` Oleg Nesterov [this message]
2013-08-05 14:45 ` Peter Zijlstra
2013-08-05 15:12 ` Alex Thorlton
2013-08-05 15:05 ` Alex Thorlton
2013-08-05 15:09 ` Rik van Riel
2013-08-05 23:03 ` Andrew Morton
2013-08-06 15:08 ` Alex Thorlton
2013-08-06 16:04 ` Rik van Riel
2013-08-08 3:49 ` David Rientjes
2013-08-11 16:56 ` Aneesh Kumar K.V
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