lkml.org 
[lkml]   [2019]   [May]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/1] sbitmap: Replace cmpxchg with xchg
Date
From: Pavel Begunkov <asml.silence@gmail.com>

cmpxchg() with an immediate value could be replaced with less expensive
xchg(). The same true if new value don't _depend_ on the old one.

In the second block, atomic_cmpxchg() return value isn't checked, so
after atomic_cmpxchg() -> atomic_xchg() conversion it could be replaced
with atomic_set(). Comparison with atomic_read() in the second chunk was
left as an optimisation (if that was the initial intention).

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
lib/sbitmap.c | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/lib/sbitmap.c b/lib/sbitmap.c
index 155fe38756ec..7d7e0e278523 100644
--- a/lib/sbitmap.c
+++ b/lib/sbitmap.c
@@ -37,9 +37,7 @@ static inline bool sbitmap_deferred_clear(struct sbitmap *sb, int index)
/*
* First get a stable cleared mask, setting the old mask to 0.
*/
- do {
- mask = sb->map[index].cleared;
- } while (cmpxchg(&sb->map[index].cleared, mask, 0) != mask);
+ mask = xchg(&sb->map[index].cleared, 0);

/*
* Now clear the masked bits in our free word
@@ -527,10 +525,8 @@ static struct sbq_wait_state *sbq_wake_ptr(struct sbitmap_queue *sbq)
struct sbq_wait_state *ws = &sbq->ws[wake_index];

if (waitqueue_active(&ws->wait)) {
- int o = atomic_read(&sbq->wake_index);
-
- if (wake_index != o)
- atomic_cmpxchg(&sbq->wake_index, o, wake_index);
+ if (wake_index != atomic_read(&sbq->wake_index))
+ atomic_set(&sbq->wake_index, wake_index);
return ws;
}

--
2.21.0
\
 
 \ /
  Last update: 2019-05-23 17:40    [W:0.056 / U:0.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site