linux-kernel - [PATCH] slab: add flags in cache

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Message-Id: <20251017064839.585204-1-kassey.li@oss.qualcomm.com>
Date: Thu, 16 Oct 2025 23:48:39 -0700
From: Kassey Li <kassey.li@....qualcomm.com>
To: vbabka@...e.cz, akpm@...ux-foundation.org, cl@...two.org,
        rientjes@...gle.com, roman.gushchin@...ux.dev, harry.yoo@...cle.com,
        linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org, kassey.li@....qualcomm.com
Subject: [PATCH] slab: add flags in cache_show

Flags info is useful to check the slab type.

for example, _SLAB_RECLAIM_ACCOUNT:

    0x50100 _SLAB_PANIC _SLAB_RECLAIM_ACCOUNT _SLAB_CMPXCHG_DOUBLE

Signed-off-by: Kassey Li <kassey.li@....qualcomm.com>
---
 mm/slab_common.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/slab_common.c b/mm/slab_common.c
index 932d13ada36c..f43239211e69 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1083,7 +1083,7 @@ static void print_slabinfo_header(struct seq_file *m)
 	 * without _too_ many complaints.
 	 */
 	seq_puts(m, "slabinfo - version: 2.1\n");
-	seq_puts(m, "# name            <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab>");
+	seq_puts(m, "# name            <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> <flags>");
 	seq_puts(m, " : tunables <limit> <batchcount> <sharedfactor>");
 	seq_puts(m, " : slabdata <active_slabs> <num_slabs> <sharedavail>");
 	seq_putc(m, '\n');
@@ -1112,9 +1112,9 @@ static void cache_show(struct kmem_cache *s, struct seq_file *m)
 	memset(&sinfo, 0, sizeof(sinfo));
 	get_slabinfo(s, &sinfo);
 
-	seq_printf(m, "%-17s %6lu %6lu %6u %4u %4d",
+	seq_printf(m, "%-17s %6lu %6lu %6u %4u %4d 0x%-8x",
 		   s->name, sinfo.active_objs, sinfo.num_objs, s->size,
-		   sinfo.objects_per_slab, (1 << sinfo.cache_order));
+		   sinfo.objects_per_slab, (1 << sinfo.cache_order), s->flags);
 
 	seq_printf(m, " : tunables %4u %4u %4u",
 		   sinfo.limit, sinfo.batchcount, sinfo.shared);
-- 
2.34.1