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xen/balloon: Clarify credit calculation

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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>
This commit is contained in:
Daniel Kiper 2011-03-28 11:34:10 +02:00 committed by Konrad Rzeszutek Wilk
parent 4dfe22f5f2
commit 83be7e52d4
1 changed files with 4 additions and 4 deletions
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8
drivers/xen/balloon.c
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@ -193,7 +193,7 @@ static enum bp_state update_schedule(enum bp_state state)
return BP_EAGAIN; return BP_EAGAIN;
} }
static unsigned long current_target(void) static long current_credit(void)
{ {
unsigned long target = balloon_stats.target_pages; unsigned long target = balloon_stats.target_pages;
@ -202,7 +202,7 @@ static unsigned long current_target(void)
balloon_stats.balloon_low + balloon_stats.balloon_low +
balloon_stats.balloon_high); balloon_stats.balloon_high);
return target; return target - balloon_stats.current_pages;
} }
static enum bp_state increase_reservation(unsigned long nr_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); mutex_lock(&balloon_mutex);
do { do {
credit = current_target() - balloon_stats.current_pages; credit = current_credit();
if (credit > 0) if (credit > 0)
state = increase_reservation(credit); 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. */ /* 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); schedule_delayed_work(&balloon_worker, 0);
mutex_unlock(&balloon_mutex); mutex_unlock(&balloon_mutex);