linux-kernel - [PATCH v4 01/35] mm, slub: don't call flush_all() from slab_debug_trace

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Date:   Thu,  5 Aug 2021 17:19:26 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Pekka Enberg <penberg@...nel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Mike Galbraith <efault@....de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Jann Horn <jannh@...gle.com>, Vlastimil Babka <vbabka@...e.cz>
Subject: [PATCH v4 01/35] mm, slub: don't call flush_all() from slab_debug_trace_open()

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@...e.cz>
Acked-by: Christoph Lameter <cl@...ux.com>
---
 mm/slub.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index af984e4990e8..f5908e6b6fb1 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -5822,9 +5822,6 @@ 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