linux-kernel - Re: [PATCH 1/5] perf trace: add support for pagefault tracing

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Message-ID: <20140625113310.GD21788@stfomichev-desktop.yandex.net>
Date:	Wed, 25 Jun 2014 15:33:10 +0400
From:	Stanislav Fomichev <stfomichev@...dex-team.ru>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...hat.com,
	dsahern@...il.com, jolsa@...hat.com,
	xiaoguangrong@...ux.vnet.ibm.com, yangds.fnst@...fujitsu.com,
	adrian.hunter@...el.com, namhyung@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] perf trace: add support for pagefault tracing

> > Also, have you considered using:
> > 
> > [root@zoo ~]# perf list exceptions:page_fault*
> >   exceptions:page_fault_user                         [Tracepoint event]
> >   exceptions:page_fault_kernel                       [Tracepoint event]
> > [root@zoo ~]#
> > 
> > Instead? I need to check if they're completely equivalent to what we
> > need here...
> Hm, didn't know there are two kinds of fault events :-/
> But it seems these are x86 only.
Maybe we can use these x86 only events to trace userspace fault duration?
It seems we can pair exceptions:page_fault_user and
context_tracking:user_enter. But it's just a theory, need to verify...
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