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Subject: [RFC][PATCH 0/4] perf: remove __weak function
 hw_perf_group_sched_in()
From: Lin Ming <ming.m.lin@intel.com>
To: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@elte.hu>,
       "eranian@gmail.com" <eranian@gmail.com>,
       "Gary.Mohr@Bull.com" <Gary.Mohr@bull.com>,
       Corey Ashford <cjashfor@linux.vnet.ibm.com>, arjan@linux.intel.com,
       "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
       Paul Mackerras <paulus@samba.org>,
       "David S. Miller" <davem@davemloft.net>
Cc: lkml <linux-kernel@vger.kernel.org>
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Date: Thu, 22 Apr 2010 15:50:55 +0800
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Hi, all

>>From the discussion of thread "[RFC] perf_events: support for uncore
a.k.a. nest units", in order to support multiple hw pmu, Peter suggested
the first thing that needs to be done is get rid of all the __weak
functions (with exception of perf_callchain*, since that really is arch
specific), includes 

hw_perf_group_sched_in
hw_perf_event_init
hw_perf_disable
hw_perf_enable

Peter Zijlstra <peterz@infradead.org> wrote:
> One thing not on that list, which should happen first I guess, is to
> remove hw_perf_group_sched_in(). The idea is to add some sort of
> transactional API to the struct pmu, so that we can delay the
> schedulability check until commit time (and roll back when it fails).
>
> Something as simple as:
>
>  struct pmu {
>    void start_txn(struct pmu *);
>    void commit_txn(struct pmu *);
>
>    ,,,
>  };
>
> and then change group_sched_in() to use this instead of
> hw_perf_group_sched_in(), whose implementations mostly replicate
> group_sched_in() in various buggy ways anyway.
>

This patch series is to remove hw_perf_group_sched_in() first.

patch 1: core, add group scheduling transactional APIs
patch 2: x86, implement group scheduling transactional APIs
patch 3: powerpc, implement group scheduling transactional APIs
patch 4: sparc, implement group scheduling transactional APIs

Thanks for any comment.

Lin Ming