在 2021年04月26日 09:37, HAGIO KAZUHITO(萩尾 一仁) 写道:
> Linux 4.8 and later kernels that contain kernel commit 9a7f38c42c2b
> ("cfq-iosched: Convert from jiffies to nanoseconds") changed the
> definition of cfq_slice_async, and it cannot be used to calculate
> the HZ value.
>
> Add alternate HZ calculation using write_expire, which depends on
> CONFIG_MQ_IOSCHED_DEADLINE or CONFIG_IOSCHED_DEADLINE.
>
> Signed-off-by: Kazuhito Hagio <[email protected]>
> ---
> task.c | 23 +++++++++++++++++++++++
> 1 file changed, 23 insertions(+)
>
> diff --git a/task.c b/task.c
> index ce2b55f430e0..36cf259e5d7b 100644
> --- a/task.c
> +++ b/task.c
> @@ -432,6 +432,29 @@ task_init(void)
> "cfq_slice_async exists: setting hz to
> %d\n",
> machdep->hz);
> }
> + } else if ((symbol_exists("dd_init_queue") &&
> + gdb_set_crash_scope(symbol_value("dd_init_queue"),
> "dd_init_queue")) ||
> + (symbol_exists("deadline_init_queue") &&
> + gdb_set_crash_scope(symbol_value("deadline_init_queue"),
> "deadline_init_queue"))) {
> + char buf[BUFSIZE];
> + uint write_expire = 0;
> +
> + open_tmpfile();
> + sprintf(buf, "printf \"%%d\", write_expire");
> + if (gdb_pass_through(buf, pc->tmpfile, GNU_RETURN_ON_ERROR)) {
> + rewind(pc->tmpfile);
> + if (fgets(buf, BUFSIZE, pc->tmpfile))
> + sscanf(buf, "%d", &write_expire);
> + }
> + close_tmpfile();
> +
> + if (write_expire) {
> + machdep->hz = write_expire / 5;
> + if (CRASHDEBUG(2))
> + fprintf(fp, "write_expire exists: setting hz to
> %d\n",
> + machdep->hz);
> + }
> + gdb_set_crash_scope(0, NULL);
> }
>
> if (VALID_MEMBER(runqueue_arrays))
>
Acked-by: Lianbo Jiang <[email protected]>
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