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

Commit Message

Vlastimil Babka July 29, 2021, 1:20 p.m. UTC

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 <[e-mail]>
Acked-by: Christoph Lameter <[e-mail]>
---
 mm/slub.c | 3 ---
 1 file changed, 3 deletions(-)

Patch

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;