[PATCH v3 01/35] mm, slub: don't call flush_all() from slab_debug_trace_open()

From: Vlastimil Babka
Date: Thu Jul 29 2021 - 09:21:44 EST


slab_debug_trace_open() can only be called on caches with SLAB_STORE_USER flag
and as with all slub debugging flags, such caches avoid cpu or percpu partial
slabs altogether, so there's nothing to flush.

Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
Acked-by: Christoph Lameter <cl@xxxxxxxxx>
---
mm/slub.c | 3 ---
1 file changed, 3 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index 090fa14628f9..422a61d7bf5f 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -5820,9 +5820,6 @@ static int slab_debug_trace_open(struct inode *inode, struct file *filep)
if (!alloc_loc_track(t, PAGE_SIZE / sizeof(struct location), GFP_KERNEL))
return -ENOMEM;

- /* Push back cpu slabs */
- flush_all(s);
-
for_each_kmem_cache_node(s, node, n) {
unsigned long flags;
struct page *page;
--
2.32.0