On Tue, Mar 09, 2021 at 01:16:13PM -0800, Shakeel Butt wrote:

On Tue, Mar 9, 2021 at 12:04 AM Vasily Averin [off-list ref] wrote:

quoted

Objects can be created from memcg-limited tasks
but its misuse may lead to host OOM.

Signed-off-by: Vasily Averin <redacted>
---
 net/ipv6/ip6_fib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index ef9d022..fa92ed1 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c

@@ -2445,7 +2445,7 @@ int __init fib6_init(void)

        fib6_node_kmem = kmem_cache_create("fib6_nodes",

Can you talk a bit more about the lifetime of the object created from
this kmem cache? Also who and what operation can trigger allocation?

The lifetime is less of a concern since we have a slab reparenting mechanism,
unless it's a very short-living object.