> 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; } } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/