From: Peter Zijlstra <peterz@infradead.org>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Stephane Eranian <eranian@google.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
linux-kernel@vger.kernel.org, mingo@elte.hu, paulus@samba.org,
davem@davemloft.net, perfmon2-devel@lists.sf.net,
eranian@gmail.com, robert.richter@amd.com,
"markus.t.metzger" <markus.t.metzger@intel.com>
Subject: Re: [PATCH] perf_events: improve DS/BTS/PEBS buffer allocation
Date: Mon, 13 Sep 2010 21:35:21 +0200 [thread overview]
Message-ID: <1284406521.2275.424.camel@laptop> (raw)
In-Reply-To: <1284406463.2275.423.camel@laptop>
On Mon, 2010-09-13 at 21:34 +0200, Peter Zijlstra wrote:
> On Mon, 2010-09-13 at 15:31 -0400, Mathieu Desnoyers wrote:
> > > Ok, so can we play the same trick you're playing with the sampling
> > > buffer, i.e., you use alloc_pages_node() for one page at a time, and
> > > then you stitch them on demand via SW?
> >
> > Well, a thought is striking me: it sounds like you are re-doing YAORB (short
> > for Yet Another Ring Buffer,
>
> He's not.. the hardware needs a large (virtually) contiguous region to
> poke data into, we need to read it out from NMI context.
Which just made me realize, we really need vmalloc_sync_all() for this,
the hardware will want to walk the pagetables as well, it cannot lazy
fault the pages in.
next prev parent reply other threads:[~2010-09-13 19:35 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-13 14:55 [PATCH] perf_events: improve DS/BTS/PEBS buffer allocation Stephane Eranian
2010-09-13 15:08 ` Peter Zijlstra
2010-09-13 15:21 ` Stephane Eranian
2010-09-13 15:09 ` Frederic Weisbecker
2010-09-13 15:13 ` Stephane Eranian
2010-09-13 15:16 ` Peter Zijlstra
2010-09-13 15:20 ` Stephane Eranian
2010-09-13 15:24 ` Peter Zijlstra
2010-09-13 15:31 ` Stephane Eranian
2010-09-13 15:41 ` Peter Zijlstra
2010-09-13 15:51 ` Frederic Weisbecker
2010-09-13 15:55 ` Stephane Eranian
2010-09-13 17:35 ` Peter Zijlstra
2010-09-13 18:40 ` Stephane Eranian
2010-09-13 18:42 ` Peter Zijlstra
2010-09-13 18:49 ` Stephane Eranian
2010-09-13 18:57 ` Peter Zijlstra
2010-09-13 19:12 ` Stephane Eranian
2010-09-13 19:31 ` Mathieu Desnoyers
2010-09-13 19:34 ` Peter Zijlstra
2010-09-13 19:35 ` Peter Zijlstra [this message]
2010-09-13 19:42 ` Mathieu Desnoyers
2010-09-13 17:24 ` Stephane Eranian
2010-09-13 17:36 ` Peter Zijlstra
2010-09-13 19:35 ` Andi Kleen
2010-09-13 19:49 ` Peter Zijlstra
2010-09-13 20:51 ` Andi Kleen
2010-09-13 20:57 ` [perfmon2] " Luck, Tony
2010-09-13 20:34 ` H. Peter Anvin
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