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    SubjectRe: [PATCH v2 2/4] perf record: implement -z=<level> and --mmap-flush=<thres> options
    On Mon, Feb 11, 2019 at 11:22:38PM +0300, Alexey Budankov wrote:

    SNIP

    > - if (rec->opts.nr_cblocks > nr_cblocks_max)
    > - rec->opts.nr_cblocks = nr_cblocks_max;
    > - if (verbose > 0)
    > - pr_info("nr_cblocks: %d\n", rec->opts.nr_cblocks);
    > + if (rec->opts.comp_level > 22)
    > + rec->opts.comp_level = 0;
    > + if (record__comp_enabled(rec) && !rec->opts.nr_cblocks) {
    > + /*
    > + * Allocate aio.data[0] buffer for compression.
    > + */
    > + rec->opts.nr_cblocks = -1;
    > + }

    I assume you're using aio.data[0] as a buffer for non-aio case
    as compression buffer.. if that's the case, please dont do that
    and use separate buffer for that

    jirka

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