linux-kernel - Re: [PATCH v2 4/4] perf report: support record trace file decompression

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Date:   Tue, 12 Feb 2019 14:09:30 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/4] perf report: support record trace file
 decompression

On Mon, Feb 11, 2019 at 11:25:00PM +0300, Alexey Budankov wrote:

SNIP

> @@ -1932,6 +2059,38 @@ fetch_mmaped_event(struct perf_session *session,
>  	return event;
>  }
>  
> +static int __perf_session__process_decomp_events(struct perf_session *session)
> +{
> +	s64 skip;
> +	u64 size, file_pos = 0;
> +	union perf_event *event;
> +	struct decomp *decomp = session->decomp_last;
> +
> +	if (!decomp)
> +		return 0;
> +
> +	while (decomp->head < decomp->size && !session_done()) {

so how this actualy works? does one PERF_RECORD_COMPRESSED event carry
complete data to unpack? or you wait to receive more PERF_RECORD_COMPRESSED
to give you data you can unpack?

jirka