> diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
> index 078701f..308fd77 100644
> --- a/Documentation/sysctl/vm.txt
> +++ b/Documentation/sysctl/vm.txt
> @@ -640,6 +640,9 @@ swappiness
> This control is used to define how aggressive the kernel will swap
> memory pages. Higher values will increase agressiveness, lower values
> decrease the amount of swap.
> +The value can be used from the [0, 100] range, where 0 means no swapping
> +at all (even if there is a swap storage enabled) while 100 means that
> +anonymous pages are reclaimed in the same rate as file pages.
I think this only correct when memcg. Even if swappiness==0, global reclaim swap
out anon pages before oom.
see below.
get_scan_count()
(snip)
if (global_reclaim(sc)) {
free = zone_page_state(zone, NR_FREE_PAGES);
/* If we have very few page cache pages,
force-scan anon pages. */
if (unlikely(file + free <= high_wmark_pages(zone))) {
fraction[0] = 1;
fraction[1] = 0;
denominator = 1;
goto out;
}
}
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