On 06/27/2018 01:41 PM, Shakeel Butt wrote:
> Currently the kernel accounts the memory for network traffic through
> mem_cgroup_[un]charge_skmem() interface. However the memory accounted
> only includes the truesize of sk_buff which does not include the size of
> sock objects. In our production environment, with opt-out kmem
> accounting, the sock kmem caches (TCP[v6], UDP[v6], RAW[v6], UNIX) are
> among the top most charged kmem caches and consume a significant amount
> of memory which can not be left as system overhead. So, this patch
> converts the kmem caches of more important sock objects to SLAB_ACCOUNT.
>
> Signed-off-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
> ---
> net/ipv4/raw.c | 1 +
> net/ipv4/tcp_ipv4.c | 2 +-
> net/ipv4/udp.c | 1 +
> net/ipv6/raw.c | 1 +
> net/ipv6/tcp_ipv6.c | 2 +-
> net/ipv6/udp.c | 1 +
> net/unix/af_unix.c | 1 +
> 7 files changed, 7 insertions(+), 2 deletions(-)
Hey, you just disclosed we do not use DCCP ;)
Joke aside, what about simply factorizing this stuff ?
diff --git a/net/core/sock.c b/net/core/sock.c
index bcc41829a16d50714bdd3c25c976c0b7296fab84..b6714f8d7e9ba313723a6f619799c56230ff5fd4 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -3243,7 +3243,8 @@ static int req_prot_init(const struct proto *prot)
rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
rsk_prot->obj_size, 0,
- prot->slab_flags, NULL);
+ SLAB_ACCOUNT | prot->slab_flags,
+ NULL);
if (!rsk_prot->slab) {
pr_crit("%s: Can't create request sock SLAB cache!\n",
@@ -3258,7 +3259,8 @@ int proto_register(struct proto *prot, int alloc_slab)
if (alloc_slab) {
prot->slab = kmem_cache_create_usercopy(prot->name,
prot->obj_size, 0,
- SLAB_HWCACHE_ALIGN | prot->slab_flags,
+ SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT |
+ prot->slab_flags,
prot->useroffset, prot->usersize,
NULL);
