linux-kernel - Re: [PATCH v7 2/2]: perf record: enable asynchronous trace writing

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Date:   Thu, 6 Sep 2018 13:04:23 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 2/2]: perf record: enable asynchronous trace writing

On Wed, Sep 05, 2018 at 10:39:25AM +0300, Alexey Budankov wrote:

SNIP

> +		} else if (errno != EAGAIN) {
> +			cblock->aio_fildes = -1;
> +			pr_err("failed to queue perf data, error: %m\n");
> +			break;
> +		}
> +	} while (1);
> +
> +	return rc;
> +}
> +
> +static int record__aio_sync(struct perf_mmap *md)
> +{

this is almost identical to record__aio_sync function,
it looks like we should be able to do the sync with
single function.. for both the in-between syncs and
the final one

jirka