netdev - [PATCH v2 net-next 0/4] net: core: use a dedicated kmem

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230206173103.2617121-1-edumazet@google.com>
Date:   Mon,  6 Feb 2023 17:30:59 +0000
From:   Eric Dumazet <edumazet@...gle.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH v2 net-next 0/4] net: core: use a dedicated kmem_cache for skb
 head allocs

Our profile data show that using kmalloc(non_const_size)/kfree(ptr)
has a certain cost, because kfree(ptr) has to pull a 'struct page'
in cpu caches.

Using a dedicated kmem_cache for TCP skb->head allocations makes
a difference, both in cpu cycles and memory savings.

This kmem_cache could also be used for GRO skb allocations,
this is left as a future exercise.

v2: addressed compile error with CONFIG_SLOB=y (kernel bots)
    Changed comment (Jakub)

Eric Dumazet (4):
  net: add SKB_HEAD_ALIGN() helper
  net: remove osize variable in __alloc_skb()
  net: factorize code in kmalloc_reserve()
  net: add dedicated kmem_cache for typical/small skb->head

 include/linux/skbuff.h |   8 +++
 net/core/skbuff.c      | 115 +++++++++++++++++++++++++++++------------
 2 files changed, 90 insertions(+), 33 deletions(-)

-- 
2.39.1.519.gcb327c4b5f-goog