linux-kernel - [RFC][PATCH 0/9] perf: remove __weak function hw_perf_event

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Date:	Mon, 10 May 2010 17:25:15 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	"eranian@...il.com" <eranian@...il.com>,
	"Gary.Mohr@...l.com" <Gary.Mohr@...l.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Paul Mackerras <paulus@...ba.org>,
	"David S. Miller" <davem@...emloft.net>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Paul Mundt <lethal@...ux-sh.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: [RFC][PATCH 0/9] perf: remove __weak function hw_perf_event_init

Hi, all

On Wed, Mar 31, 2010 at 1:15 AM, Peter Zijlstra <peterz@...radead.org> wrote:
>
> Right, I've got some definite ideas on how to go here, just need some
> time to implement them.
>
> 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).
>
> For hw_perf_event_init() we need to create a pmu registration facility
> and lookup a pmu_id, either passed as an actual id found in sysfs or an
> open file handle from sysfs (the cpu pmu would be pmu_id 0 for backwards
> compat).

Here are 9 small patches to remove __weak function hw_perf_event_init

[PATCH 1/9] perf: un-const struct pmu *
A new field "id" will be added to struct pmu, and the "id" is assigned
at registration time, so the struct is not const any more.

[PATCH 2/9] perf: core, remove weak function hw_perf_event_init
A new field "pmu_id" is added to struct perf_event_attr.
2 new functions: perf_event_register_pmu, perf_event_lookup_pmu
perf_event_register_pmu: the pmu registration facility
perf_event_lookup_pmu: lookup the pmu via the passed in
event->attr.pmu_id.
A new api pmu->init_event to replace hw_perf_event_init

[PATCH 3/9] perf: export registered pmus via sysfs
Export pmus via sysfs /sys/devices/system/cpu/pmus/0...N
The file name is the pmu id, so perf tool can use it to initialize
perf_event_attr.

[PATCH 4/9] perf: x86, convert to new API pmu->init_event
[PATCH 5/9] perf: arm, convert to new API pmu->init_event
[PATCH 6/9] perf: powerpc, convert to new API pmu->init_event
[PATCH 7/9] perf: sh, convert to new API pmu->init_event
[PATCH 8/9] perf: sparc, convert to new API pmu->init_event
[PATCH 9/9] perf top: set perf_event_attr->pmu_id

Thanks for any comments.

Lin Ming

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