[PATCH 1/2] slab: add flag to block merging of UAPI elements
From: Stephen Hemminger <stephen@networkplumber.org>
Date: 2018-02-24 19:05:04
Also in:
linux-mm
Subsystem:
memory management, slab allocator, the rest · Maintainers:
Andrew Morton, Vlastimil Babka, Harry Yoo, Linus Torvalds
The iproute2 program ss reads /proc/slabinfo to get TCP socket statistics; therefore those kmem cache's can not be merged. This patch adds a new flag to block merging in these kind of cases. Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> --- include/linux/slab.h | 6 ++++++ mm/slab_common.c | 2 +- 2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 231abc8976c5..867acc2ddcbc 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h@@ -108,6 +108,12 @@ #define SLAB_KASAN 0 #endif +/* + * Some old applications may want to read/write particular slab cache + * by name and therefore this can not be merged. + */ +#define SLAB_VISIBLE_UAPI 0x10000000UL + /* The following flags affect the page allocator grouping pages by mobility */ /* Objects are reclaimable */ #define SLAB_RECLAIM_ACCOUNT ((slab_flags_t __force)0x00020000U)
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 10f127b2de7c..71eb5fc63cf8 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c@@ -49,7 +49,7 @@ static DECLARE_WORK(slab_caches_to_rcu_destroy_work, */ #define SLAB_NEVER_MERGE (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ SLAB_TRACE | SLAB_TYPESAFE_BY_RCU | SLAB_NOLEAKTRACE | \ - SLAB_FAILSLAB | SLAB_KASAN) + SLAB_FAILSLAB | SLAB_KASAN | SLAB_VISIBLE_UAPI) #define SLAB_MERGE_SAME (SLAB_RECLAIM_ACCOUNT | SLAB_CACHE_DMA | \ SLAB_ACCOUNT)
--
2.16.1
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