linux-kernel - RE: [perfmon2] [PATCH] perf_events: improve DS/BTS/PEBS buffer allocation

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Message-ID: <987664A83D2D224EAE907B061CE93D53015DC52F43@orsmsx505.amr.corp.intel.com>
Date:	Mon, 13 Sep 2010 13:57:17 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <peterz@...radead.org>
CC:	"perfmon2-devel@...ts.sf.net" <perfmon2-devel@...ts.sf.net>,
	"eranian@...il.com" <eranian@...il.com>,
	"fweisbec@...il.com" <fweisbec@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"eranian@...gle.com" <eranian@...gle.com>,
	"paulus@...ba.org" <paulus@...ba.org>,
	"Metzger, Markus T" <markus.t.metzger@...el.com>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"davem@...emloft.net" <davem@...emloft.net>
Subject: RE: [perfmon2] [PATCH] perf_events: improve DS/BTS/PEBS buffer
	allocation

> I am not aware of any real technical issues, except that
> it needs to be done for both 32bit and 64bit.

Some good documentation on when you need vmalloc_sync_all(), and
why most places don't need it would help to avoid a surge of
patches spraying calls to it all over the kernel.

-Tony
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