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authorDaniel Kiper <dkiper@net-space.pl>2011-03-28 11:34:10 +0200
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-03-30 11:54:44 -0400
commit83be7e52d46a5b3a9955a38a9597bf1de1851ea7 (patch)
tree665164261531c284b5dc5922cd42bc503e1d40ff /drivers/xen
parent4dfe22f5f24345511c378272189b7504d67767fb (diff)
downloadop-kernel-dev-83be7e52d46a5b3a9955a38a9597bf1de1851ea7.zip
op-kernel-dev-83be7e52d46a5b3a9955a38a9597bf1de1851ea7.tar.gz
xen/balloon: Clarify credit calculation
Move credit calculation to current_target() and rename it to current_credit(). Acked-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Signed-off-by: Daniel Kiper <dkiper@net-space.pl> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/balloon.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 42a0ba0..a6d8e59 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -193,7 +193,7 @@ static enum bp_state update_schedule(enum bp_state state)
return BP_EAGAIN;
}
-static unsigned long current_target(void)
+static long current_credit(void)
{
unsigned long target = balloon_stats.target_pages;
@@ -202,7 +202,7 @@ static unsigned long current_target(void)
balloon_stats.balloon_low +
balloon_stats.balloon_high);
- return target;
+ return target - balloon_stats.current_pages;
}
static enum bp_state increase_reservation(unsigned long nr_pages)
@@ -337,7 +337,7 @@ static void balloon_process(struct work_struct *work)
mutex_lock(&balloon_mutex);
do {
- credit = current_target() - balloon_stats.current_pages;
+ credit = current_credit();
if (credit > 0)
state = increase_reservation(credit);
@@ -420,7 +420,7 @@ void free_xenballooned_pages(int nr_pages, struct page** pages)
}
/* The balloon may be too large now. Shrink it if needed. */
- if (current_target() != balloon_stats.current_pages)
+ if (current_credit())
schedule_delayed_work(&balloon_worker, 0);
mutex_unlock(&balloon_mutex);
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