perf mem: Fix wrong verbose output for recording events

perf mem: Fix wrong verbose output for recording events

Current code:

for (j = 0; j < argc; j++, i++)
        rec_argv[i] = argv[j];

if (verbose > 0) {
        pr_debug("calling: record ");

        while (rec_argv[j]) {
                pr_debug("%s ", rec_argv[j]);
                j++;
        }
        pr_debug("\n");
}

The entries of argv[] are copied to the end of rec_argv[], not
copied to the beginning of rec_argv[]. So the index j at
rec_argv[] doesn't point to the first event.

Now we record the start index and end index for events in rec_argv[],
and print them if verbose is enabled.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210527001610.10553-7-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>