From: Andi Kleen <andi@firstfloor.org>
To: eranian@google.com
Cc: linux-kernel@vger.kernel.org, peterz@infradead.org,
mingo@elte.hu, paulus@samba.org, davem@davemloft.net,
fweisbec@gmail.com, perfmon2-devel@lists.sf.net,
eranian@gmail.com, robert.richter@amd.com,
markus.t.metzger@intel.com
Subject: Re: [PATCH] perf_events: improve DS/BTS/PEBS buffer allocation
Date: Mon, 13 Sep 2010 21:35:39 +0200 [thread overview]
Message-ID: <877hip4et0.fsf@basil.nowhere.org> (raw)
In-Reply-To: <4c8e3c0c.12d1d80a.73d9.ffffcf21@mx.google.com> (Stephane Eranian's message of "Mon, 13 Sep 2010 16:55:01 +0200")
Stephane Eranian <eranian@google.com> writes:
> The DS, BTS, and PEBS memory regions were allocated using kzalloc(), i.e.,
> requesting contiguous physical memory. There is no such restriction on
> DS, PEBS and BTS buffers. Using kzalloc() could lead to error in case
> no contiguous physical memory is available. BTS is requesting 64KB,
> thus it can cause issues. PEBS is currently only requesting one page.
> Both PEBS and BTS are static buffers allocated for each CPU at the
> first user. When the last user exists, the buffers are released.
DS supports page tables, but I have some doubts it really
supports page faults. vmalloc today does page faults.
I think the change is a good idea, but it will need vmalloc_sync_all()
everywhere.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
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 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
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 [this message]
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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