On Thu, 19 Jan 2006, Andrew Morton wrote:
> laptop_mode=1: don't write out dirty pages if we're only performing light
> scanning. But do write them out once page reclaim starts getting into
> difficulty.
Ahh. Now I see ..... Wrong field.
> I guess if zone reclaim wants to permanently disable writeback then it'll
> be needing a new scan_control flag for that. Which means that we need to
We have such a flag and its called may_swap (was introduced by Martin
Hicks). If we cannot swap then we should not write out pages.
Thus we need this fix instead:
Signed-off-by: Christoph Lameter <[email protected]>
Index: linux-2.6.16-rc1-mm1/mm/vmscan.c
===================================================================
--- linux-2.6.16-rc1-mm1.orig/mm/vmscan.c 2006-01-19 15:50:19.000000000 -0800
+++ linux-2.6.16-rc1-mm1/mm/vmscan.c 2006-01-19 17:26:50.000000000 -0800
@@ -491,7 +491,7 @@ static int shrink_list(struct list_head
goto keep_locked;
if (!may_enter_fs)
goto keep_locked;
- if (laptop_mode && !sc->may_writepage)
+ if ((laptop_mode && !sc->may_writepage) || !sc->may_swap)
goto keep_locked;
/* Page is dirty, try to write it out here */
-
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