[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20140910163556.GE4783@worktop.ger.corp.intel.com>
Date: Wed, 10 Sep 2014 18:35:56 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Andi Kleen <andi@...stfloor.org>
Cc: linux-kernel@...r.kernel.org, mingo@...nel.org, eranian@...gle.com,
tglx@...utronix.de, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] perf, x86: Fall back to vmalloc for BTS buffer allocation
On Wed, Sep 10, 2014 at 04:40:12PM +0200, Andi Kleen wrote:
> > We did this once, and that blew up big time.
> >
> > Even now, vmalloc_fault() has a very explicit:
> >
> > WARN_ON_ONCE(in_nmi());
> >
> > So this isn't going to happen until you fix that.
>
> Good point.
>
> We just need to call vmalloc_sync_all at allocation time,
> no need to change vmalloc_fault.
Somehow that wasn't considered adequate, but lemme try and dig out that
thread. It should be somewhere...
https://lkml.org/lkml/2010/7/14/465
--
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/
Powered by blists - more mailing lists