On Thu, Nov 22, 2012 at 11:41:07PM +0800, Fengguang Wu wrote:On Wed, Nov 21, 2012 at 12:07:22PM +0200, Metin DÃÅlà wrote:Ah it's more likely caused by this logic:On Wed, Nov 21, 2012 at 12:00 PM, Jaegeuk Hanse <jaegeuk.hanse@xxxxxxxxx> wrote:I wonder if it's this code that stops data-1 pages from beingOn 11/21/2012 05:58 PM, metin d wrote:But why these page caches are in this state as opposed to other page
Hi Fengguang,
I run tests and attached the results. The line below I guess shows the data-1 page caches.
0x000000080000006c 6584051 25718 __RU_lA___________________P________ referenced,uptodate,lru,active,private
I thinks this is just one state of page cache pages.
caches. From the results I conclude that:
data-1 pages are in state : referenced,uptodate,lru,active,private
reclaimed:
shrink_page_list():
if (page_has_private(page)) {
if (!try_to_release_page(page, sc->gfp_mask))
goto activate_locked;
What's the filesystem used?
if (is_active_lru(lru)) {
if (inactive_list_is_low(mz, file))
shrink_active_list(nr_to_scan, mz, sc, priority, file);
The active file list won't be scanned at all if it's smaller than the
active list. In this case, it's inactive=33586MB > active=25719MB. So
the data-1 pages in the active list will never be scanned and reclaimed.
data-2 pages are in state : referenced,uptodate,lru,mappedtodiskThanks,
Fengguang