linux-kernel - Re: [PATCH v7 08/12] perf record: implement compression for AIO trace streaming

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Date:   Wed, 13 Mar 2019 15:36:51 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 08/12] perf record: implement compression for AIO
 trace streaming

On Tue, Mar 12, 2019 at 08:30:13AM +0300, Alexey Budankov wrote:

SNIP

> -
> -	md->prev = head;
> -	perf_mmap__consume(md);
> -
> -	rc = push(to, &md->aio.cblocks[idx], md->aio.data[idx], size0 + size, *off);
> -	if (!rc) {
> -		*off += size0 + size;
> -	} else {
> -		/*
> -		 * Decrement md->refcount back if aio write
> -		 * operation failed to start.
> -		 */
> -		perf_mmap__put(md);
> -	}
> -
> -	return rc;
> -}
>  #else /* !HAVE_AIO_SUPPORT */
>  static int perf_mmap__aio_enabled(struct perf_mmap *map __maybe_unused)
>  {
> @@ -566,7 +492,7 @@ int perf_mmap__push(struct perf_mmap *md, void *to,
>  
>  	rc = perf_mmap__read_init(md);
>  	if (rc < 0)
> -		return (rc == -EAGAIN) ? 0 : -1;
> +		return (rc == -EAGAIN) ? 1 : -1;

hum, should this be in part of this one?

  perf record: implement -f,--mmap-flush=<threshold> option


jirka