The patch titled
Subject: mm/vmalloc: use __this_cpu_try_cmpxchg() in preload_this_cpu_lock()
has been added to the -mm mm-unstable branch. Its filename is
mm-vmalloc-use-__this_cpu_try_cmpxchg-in-preload_this_cpu_lock.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmalloc-use-__this_cpu_try_cmpxchg-in-preload_this_cpu_lock.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Uros Bizjak <ubizjak@xxxxxxxxx>
Subject: mm/vmalloc: use __this_cpu_try_cmpxchg() in preload_this_cpu_lock()
Date: Tue, 28 May 2024 16:43:14 +0200
Use __this_cpu_try_cmpxchg() instead of __this_cpu_cmpxchg (*ptr, old,
new) == old in preload_this_cpu_lock(). x86 CMPXCHG instruction returns
success in ZF flag, so this change saves a compare after cmpxchg.
The generated code improves from:
4bb6: 48 85 f6 test %rsi,%rsi
4bb9: 0f 84 10 fa ff ff je 45cf <...>
4bbf: 4c 89 e8 mov %r13,%rax
4bc2: 65 48 0f b1 35 00 00 cmpxchg %rsi,%gs:0x0(%rip)
4bc9: 00 00
4bcb: 48 85 c0 test %rax,%rax
4bce: 0f 84 fb f9 ff ff je 45cf <...>
to:
4bb6: 48 85 f6 test %rsi,%rsi
4bb9: 0f 84 10 fa ff ff je 45cf <...>
4bbf: 4c 89 e8 mov %r13,%rax
4bc2: 65 48 0f b1 35 00 00 cmpxchg %rsi,%gs:0x0(%rip)
4bc9: 00 00
4bcb: 0f 84 fe f9 ff ff je 45cf <...>
No functional change intended.
Link: https://lkml.kernel.org/r/20240528144345.5980-2-ubizjak@xxxxxxxxx
Signed-off-by: Uros Bizjak <ubizjak@xxxxxxxxx>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Lorenzo Stoakes <lstoakes@xxxxxxxxx>
Cc: Dennis Zhou <dennis@xxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmalloc.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/mm/vmalloc.c~mm-vmalloc-use-__this_cpu_try_cmpxchg-in-preload_this_cpu_lock
+++ a/mm/vmalloc.c
@@ -1816,7 +1816,7 @@ static void free_vmap_area(struct vmap_a
static inline void
preload_this_cpu_lock(spinlock_t *lock, gfp_t gfp_mask, int node)
{
- struct vmap_area *va = NULL;
+ struct vmap_area *va = NULL, *tmp;
/*
* Preload this CPU with one extra vmap_area object. It is used
@@ -1832,7 +1832,8 @@ preload_this_cpu_lock(spinlock_t *lock,
spin_lock(lock);
- if (va && __this_cpu_cmpxchg(ne_fit_preload_node, NULL, va))
+ tmp = NULL;
+ if (va && !__this_cpu_try_cmpxchg(ne_fit_preload_node, &tmp, va))
kmem_cache_free(vmap_area_cachep, va);
}
_
Patches currently in -mm which might be from ubizjak@xxxxxxxxx are
percpu-add-__this_cpu_try_cmpxchg.patch
mm-vmalloc-use-__this_cpu_try_cmpxchg-in-preload_this_cpu_lock.patch
fork-use-this_cpu_try_cmpxchg-in-try_release_thread_stack_to_cache.patch
fork-use-this_cpu_try_cmpxchg-in-try_release_thread_stack_to_cache-fix.patch
