On Mon, Feb 11, 2019 at 11:22:38PM +0300, Alexey Budankov wrote: SNIP
> @@ -1147,6 +1193,10 @@ static int __cmd_record(struct record *rec, int argc, > const char **argv) > fd = perf_data__fd(data); > rec->session = session; > > + rec->opts.comp_level = 0; > + session->header.env.comp_level = rec->opts.comp_level; > + session->header.env.comp_type = PERF_COMP_NONE; > + > record__init_features(rec); > > if (rec->opts.use_clockid && rec->opts.clockid_res_ns) > @@ -1176,6 +1226,7 @@ static int __cmd_record(struct record *rec, int argc, > const char **argv) > err = -1; > goto out_child; > } > + session->header.env.comp_mmap_len = session->evlist->mmap_len; so the comp_mmap_len is the max length of the compressed packet? any idea if this value might have some impact on the processing speed? I see you mentioned the size reduction, could you also meassure the record overhead? thanks, jirka
