Hi Philipp,
-----Original Message-----
> Check first if a page is dumpable before printing the process. Otherwise
> there is the chance that num_dumped % per == 0 at the beginning of the
> block of undampable pages. In that case num_dumped isn't updated before
> the next dumpable page and thus print_process is called for every page
> in that block.
>
> This is especially annoying when the block is after the last dumpable
> page and thus num_dumped == info->num_dumpable. In that case
> print_process will bypass its check to only print the process once every
> second and thus flood the console with unnecessary prints. This can lead
> to a severe decrease in performance especially when the console is in
> line mode.
Good catch and improvement, will merge this.
Thanks,
Kazu
>
> Signed-off-by: Philipp Rudo <prudo@xxxxxxxxxx>
> ---
> makedumpfile.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/makedumpfile.c b/makedumpfile.c
> index 14556db..2ef3458 100644
> --- a/makedumpfile.c
> +++ b/makedumpfile.c
> @@ -8884,16 +8884,16 @@ write_kdump_pages_cyclic(struct cache_data *cd_header, struct cache_data *cd_pag
>
> for (pfn = start_pfn; pfn < end_pfn; pfn++) {
>
> - if ((num_dumped % per) == 0)
> - print_progress(PROGRESS_COPY, num_dumped, info->num_dumpable, &ts_start);
> -
> /*
> * Check the excluded page.
> */
> if (!is_dumpable(info->bitmap2, pfn, cycle))
> continue;
>
> + if ((num_dumped % per) == 0)
> + print_progress(PROGRESS_COPY, num_dumped, info->num_dumpable, &ts_start);
> num_dumped++;
> +
> if (!read_pfn(pfn, buf))
> goto out;
>
> --
> 2.35.1
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