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Message-Id: <1392635499-24878-1-git-send-email-bob.liu@oracle.com>
Date: Mon, 17 Feb 2014 19:11:39 +0800
From: Bob Liu <lliubbo@...il.com>
To: konrad.wilk@...cle.com
Cc: xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
Bob Liu <bob.liu@...cle.com>
Subject: [PATCH] drivers:xen-selfballoon:reset 'frontswap_inertia_counter' after frontswap_shrink
When I looked at this issue https://lkml.org/lkml/2013/11/21/158, I found that
frontswap_selfshrink() doesn't work as expected sometimes.
Pages are continuously added to frontswap and gotten back soon. It's a waste of
cpu time and increases the memory pressue of Guest OS.
Take an example.
First time in frontswap_selfshrink():
1. last_frontswap_pages = cur_frontswap_pages = 0
2. cur_frontswap_pages = frontswap_curr_pages() = 100
When 'frontswap_inertia_counter' decreased to 0:
1. last_frontswap_pages = cur_frontswap_pages = 100
2. cur_frontswap_pages = frontswap_curr_pages() = 100
3. call frontswap_shrink() and let's assumption that 10 pages are gotten back
from frontswap.
4. now frontswap_curr_pages() is 90.
If then memory is not enough in Guest OS and 9 more pages(smaller than gotten
back) added to frontswap.
Now frontswap_curr_pages() is 99 and we don't expect to get back more pages from
frontswap because geust os is under memory pressure.
But next time in frontswap_selfshrink():
1. last_frontswap_pages is set to the old value of cur_frontswap_pages(still
100)
2. cur_frontswap_pages(99) is still smaller than last_frontswap_pages.
3. call frontswap_shrink() and continue to get back pages from frontswap!!
Signed-off-by: Bob Liu <bob.liu@...cle.com>
---
drivers/xen/xen-selfballoon.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/xen/xen-selfballoon.c b/drivers/xen/xen-selfballoon.c
index 21e18c1..bd0b416 100644
--- a/drivers/xen/xen-selfballoon.c
+++ b/drivers/xen/xen-selfballoon.c
@@ -170,6 +170,7 @@ static void frontswap_selfshrink(void)
tgt_frontswap_pages = cur_frontswap_pages -
(cur_frontswap_pages / frontswap_hysteresis);
frontswap_shrink(tgt_frontswap_pages);
+ frontswap_inertia_counter = frontswap_inertia;
}
#endif /* CONFIG_FRONTSWAP */
--
1.7.10.4
--
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