The patch titled
Subject: memcg: account security cred as well to kmemcg
has been removed from the -mm tree. Its filename was
memcg-account-security-cred-as-well-to-kmemcg.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Shakeel Butt <shakeelb@xxxxxxxxxx>
Subject: memcg: account security cred as well to kmemcg
The cred_jar kmem_cache is already memcg accounted in the current kernel
but cred->security is not. Account cred->security to kmemcg.
Recently we saw high root slab usage on our production and on further
inspection, we found a buggy application leaking processes. Though
that buggy application was contained within its memcg but we observe
much more system memory overhead, couple of GiBs, during that period.
This overhead can adversely impact the isolation on the system. One of
source of high overhead, we found was cred->secuity objects, which have
a lifetime of at least the life of the process which allocated them.
Link: http://lkml.kernel.org/r/20191205223721.40034-1-shakeelb@xxxxxxxxxx
Signed-off-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Acked-by: Chris Down <chris@xxxxxxxxxxxxxx>
Reviewed-by: Roman Gushchin <guro@xxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/cred.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/kernel/cred.c~memcg-account-security-cred-as-well-to-kmemcg
+++ a/kernel/cred.c
@@ -223,7 +223,7 @@ struct cred *cred_alloc_blank(void)
new->magic = CRED_MAGIC;
#endif
- if (security_cred_alloc_blank(new, GFP_KERNEL) < 0)
+ if (security_cred_alloc_blank(new, GFP_KERNEL_ACCOUNT) < 0)
goto error;
return new;
@@ -282,7 +282,7 @@ struct cred *prepare_creds(void)
new->security = NULL;
#endif
- if (security_prepare_creds(new, old, GFP_KERNEL) < 0)
+ if (security_prepare_creds(new, old, GFP_KERNEL_ACCOUNT) < 0)
goto error;
validate_creds(new);
return new;
@@ -715,7 +715,7 @@ struct cred *prepare_kernel_cred(struct
#ifdef CONFIG_SECURITY
new->security = NULL;
#endif
- if (security_prepare_creds(new, old, GFP_KERNEL) < 0)
+ if (security_prepare_creds(new, old, GFP_KERNEL_ACCOUNT) < 0)
goto error;
put_cred(old);
_
Patches currently in -mm which might be from shakeelb@xxxxxxxxxx are
