linux-kernel - Re: [RFC][PATCH] perf: sysfs type id

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Message-ID: <AANLkTik1PoO6hwMH05YL19km7zYH_C3d-OocNSp2UTUv@mail.gmail.com>
Date:	Wed, 10 Nov 2010 15:24:57 +0100
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Lin Ming <ming.m.lin@...el.com>,
	"robert.richter" <robert.richter@....com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	fweisbec <fweisbec@...il.com>, paulus <paulus@...ba.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Kay Sievers <kay.sievers@...y.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [RFC][PATCH] perf: sysfs type id

On Wed, Nov 10, 2010 at 3:10 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, 2010-11-10 at 14:01 +0100, Stephane Eranian wrote:
>> Peter,
>
>> > 6
>>
>> And then, what do you do with 6?
>> I assume you have to pass it in the attr struct.
>
> perf_event_attr::type, as said in the initial changelog.
>
>> How do you plan on doing this while keeping what is already there?
>
> +       if (type < 0) {
> +               err = idr_get_new_above(&pmu_idr, pmu, PERF_TYPE_MAX, &type);
>
> and
>
> +       rcu_read_lock();
> +       pmu = idr_find(&pmu_idr, event->attr.type);
> +       rcu_read_unlock();
> +       if (pmu)
> +               goto unlock;
>
>
> So we start dynamic IDs at the top of the static range, and only do
> dynamic IDs for those that don't already have a static number.
>
>
Ok, should work fine.
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