linux-kernel - Re: [PATCH 3/8] perf/core: Add perf_sample_save_raw

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Message-ID: <Y8E+L3DSYu0k8+e0@hirez.programming.kicks-ass.net>
Date:   Fri, 13 Jan 2023 12:19:11 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, Song Liu <song@...nel.org>,
        linux-s390@...r.kernel.org, x86@...nel.org, bpf@...r.kernel.org
Subject: Re: [PATCH 3/8] perf/core: Add perf_sample_save_raw_data() helper

On Thu, Jan 12, 2023 at 01:40:10PM -0800, Namhyung Kim wrote:
> @@ -1182,6 +1187,29 @@ static inline void perf_sample_save_callchain(struct perf_sample_data *data,
>  	data->sample_flags |= PERF_SAMPLE_CALLCHAIN;
>  }
>  
> +static inline void perf_sample_save_raw_data(struct perf_sample_data *data,
> +					     struct perf_raw_record *raw)
> +{
> +	struct perf_raw_frag *frag = &raw->frag;
> +	u32 sum = 0;
> +	int size;
> +
> +	do {
> +		sum += frag->size;
> +		if (perf_raw_frag_last(frag))
> +			break;
> +		frag = frag->next;
> +	} while (1);
> +
> +	size = round_up(sum + sizeof(u32), sizeof(u64));
> +	raw->size = size - sizeof(u32);
> +	frag->pad = raw->size - sum;
> +
> +	data->raw = raw;
> +	data->dyn_size += size;
> +	data->sample_flags |= PERF_SAMPLE_RAW;
> +}

This might be a wee big for inline, but I suppose it doesn't matter too
much.