[v2] mm/swap_slots.c: assign|reset cache slot by value directly
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Message ID 20200311055352.50574-1-richard.weiyang@linux.alibaba.com
State New
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Series
  • [v2] mm/swap_slots.c: assign|reset cache slot by value directly
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Commit Message

Wei Yang March 11, 2020, 5:53 a.m. UTC
Currently we use a tmp pointer, pentry, to transfer and reset swap cache
slot, which is a little redundant. Swap cache slot stores the entry
value directly, assign and reset it by value would be straight forward.

Also this patch merges the else and if, since this is the only case we
refill and repeat swap cache.

Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
CC: Tim Chen <tim.c.chen@linux.intel.com>

---
v2: keep the reset step after use, but remove the tmp pointer
---
 mm/swap_slots.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

Comments

Tim Chen March 11, 2020, 4:10 p.m. UTC | #1
On 3/10/20 10:53 PM, Wei Yang wrote:
> Currently we use a tmp pointer, pentry, to transfer and reset swap cache
> slot, which is a little redundant. Swap cache slot stores the entry
> value directly, assign and reset it by value would be straight forward.
> 
> Also this patch merges the else and if, since this is the only case we
> refill and repeat swap cache.
> 
> Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
> CC: Tim Chen <tim.c.chen@linux.intel.com>

Acked-by: Tim Chen <tim.c.chen@linux.intel.com>

> 
> ---
> v2: keep the reset step after use, but remove the tmp pointer
> ---

Patch
diff mbox series

diff --git a/mm/swap_slots.c b/mm/swap_slots.c
index 63a7b4563a57..0975adc72253 100644
--- a/mm/swap_slots.c
+++ b/mm/swap_slots.c
@@ -309,7 +309,7 @@  int free_swap_slot(swp_entry_t entry)
 
 swp_entry_t get_swap_page(struct page *page)
 {
-	swp_entry_t entry, *pentry;
+	swp_entry_t entry;
 	struct swap_slots_cache *cache;
 
 	entry.val = 0;
@@ -336,13 +336,11 @@  swp_entry_t get_swap_page(struct page *page)
 		if (cache->slots) {
 repeat:
 			if (cache->nr) {
-				pentry = &cache->slots[cache->cur++];
-				entry = *pentry;
-				pentry->val = 0;
+				entry = cache->slots[cache->cur];
+				cache->slots[cache->cur++].val = 0;
 				cache->nr--;
-			} else {
-				if (refill_swap_slots_cache(cache))
-					goto repeat;
+			} else if (refill_swap_slots_cache(cache)) {
+				goto repeat;
 			}
 		}
 		mutex_unlock(&cache->alloc_lock);