linux-kernel - Re: [PATCH v4 1/6] perf: prepare perf_event.h for new types perf_kprobe and perf

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Message-ID: <20171206101722.e5pjfl6gpczkqlme@hirez.programming.kicks-ass.net>
Date:   Wed, 6 Dec 2017 11:17:22 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Song Liu <songliubraving@...com>
Cc:     rostedt@...dmis.org, mingo@...hat.com, davem@...emloft.net,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        daniel@...earbox.net, kernel-team@...com
Subject: Re: [PATCH v4 1/6] perf: prepare perf_event.h for new types
 perf_kprobe and perf_uprobe

On Mon, Dec 04, 2017 at 05:27:24PM -0800, Song Liu wrote:
> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
> index 362493a..0f39b31 100644
> --- a/include/uapi/linux/perf_event.h
> +++ b/include/uapi/linux/perf_event.h
> @@ -291,6 +291,16 @@ enum perf_event_read_format {
>  	PERF_FORMAT_MAX = 1U << 4,		/* non-ABI */
>  };
>  
> +/*
> + * Flags in config, used by dynamic PMU kprobe and uprobe
> + *
> + * PERF_PROBE_CONFIG_IS_RETPROBE if set, create kretprobe/uretprobe
> + *                               if not set, create kprobe/uprobe
> + */
> +enum perf_probe_config {
> +	PERF_PROBE_CONFIG_IS_RETPROBE		= 1U << 0,  /* [k,u]retprobe */
> +};

This should not be in uapi; pmu's can describe their config format in
sysfs.

PMU_FORMAT_ATTR(retprobe, "config:0");

static struct attribute *kprobe_attr[] = {
	&format_attr_retprobe,
	NULL,
};

static struct attribute_group kprobe_format_group = {
	.name = "format",
	.attrs = kprobe_attrs,
};

static const struct attribute_group *kprobe_attr_groups[] = {
	&kprobe_format_group,
	NULL,
};

struct pmu perf_kprobe {
	...

	.attr_groups = kprobe_attr_groups,
};

Other than that, this series looks good to me. Thanks!