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Following loop in napi_skb_cache_put() is unrolled by the compiler even if CONFIG_KASAN is not enabled: for (i = NAPI_SKB_CACHE_HALF; i < NAPI_SKB_CACHE_SIZE; i++) kasan_mempool_unpoison_object(nc->skb_cache[i], kmem_cache_size(net_hotdata.skbuff_cache)); We have 32 times this sequence, for a total of 384 bytes. 48 8b 3d 00 00 00 00 net_hotdata.skbuff_cache,%rdi e8 00 00 00 00 call kmem_cache_size This is because kmem_cache_size() is not an inline and not const, and kasan_unpoison_object_data() is an inline function. Cache kmem_cache_size() result in a variable, so that the compiler can remove dead code (and variable) when/if CONFIG_KASAN is unset. After this patch, napi_skb_cache_put() is inlined in its callers, and we avoid one kmem_cache_size() call in napi_skb_cache_get() and napi_skb_cache_get_bulk(). Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Jacob Keller <jacob.e.keller@intel.com> Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com> Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com> Link: https://patch.msgid.link/20251016182911.1132792-1-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.