Messages in this thread | | | From | Alexey Ivanov <> | Subject | Re: mapped pagecache pages vs unmapped pages | Date | Tue, 10 Apr 2012 03:50:53 +0400 |
| |
Did you consider making this ratio tunable, at least manually(i.e. via sysctl)? I suppose we are not the only ones with almost-whole-ram-mmaped workload.
09.04.2012, 22:56, "Rik van Riel" <riel@redhat.com>: > On 04/09/2012 01:11 PM, Alexey Ivanov wrote: > >> Thanks for the hint! >> >> Can anyone clarify the reason of not using zone->inactive_ratio in inactive_file_is_low_global()? > > New anonymous pages start out on the active anon list, and > are always referenced. If memory fills up, they may end > up getting moved to the inactive anon list; being referenced > while on the inactive anon list is enough to get them promoted > back to the active list. > > New file pages start out on the INACTIVE file list, and > start their lives not referenced at all. Due to readahead > extra reads, many file pages may never be referenced. > > Only file pages that are referenced twice make it onto > the active list. > > This means the inactive file list has to be large enough > for all the readahead buffers, and give pages enough time > on the list that frequently accessed ones can get accessed > twice and promoted. > > http://linux-mm.org/PageReplacementDesign > > -- > All rights reversed
-- Alexey Ivanov Yandex Search Admin Team -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |