From: Kairui Song <ryncsn@gmail.com>
To: linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
"Huang, Ying" <ying.huang@intel.com>,
linux-kernel@vger.kernel.org, Kairui Song <kasong@tencent.com>
Subject: [PATCH] mm/swap: avoid a xa load for swapout path
Date: Tue, 17 Oct 2023 09:17:28 +0800 [thread overview]
Message-ID: <20231017011728.37508-1-ryncsn@gmail.com> (raw)
From: Kairui Song <kasong@tencent.com>
A variable is never used for swapout path (shadowp is NULL) and compiler
is unable to optimize out the unneeded load since it's a function call.
Signed-off-by: Kairui Song <kasong@tencent.com>
---
mm/swap_state.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/mm/swap_state.c b/mm/swap_state.c
index b3b14bd0dd64..ab79ffb71736 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -109,9 +109,9 @@ int add_to_swap_cache(struct folio *folio, swp_entry_t entry,
goto unlock;
for (i = 0; i < nr; i++) {
VM_BUG_ON_FOLIO(xas.xa_index != idx + i, folio);
- old = xas_load(&xas);
- if (xa_is_value(old)) {
- if (shadowp)
+ if (shadowp) {
+ old = xas_load(&xas);
+ if (xa_is_value(old))
*shadowp = old;
}
xas_store(&xas, folio);
--
2.42.0
next reply other threads:[~2023-10-17 1:18 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-17 1:17 Kairui Song [this message]
2023-10-17 3:00 ` [PATCH] mm/swap: avoid a xa load for swapout path Matthew Wilcox
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