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Miller" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" From: Yunsheng Lin Date: Sat, 25 Nov 2023 20:29:22 +0800 > On 2023/11/24 23:47, Alexander Lobakin wrote: >> After commit 5027ec19f104 ("net: page_pool: split the page_pool_params >> into fast and slow") that made &page_pool contain only "hot" params at >> the start, cacheline boundary chops frag API fields group in the middle >> again. >> To not bother with this each time fast params get expanded or shrunk, >> let's just align them to `4 * sizeof(long)`, the closest upper pow-2 to >> their actual size (2 longs + 2 ints). This ensures 16-byte alignment for >> the 32-bit architectures and 32-byte alignment for the 64-bit ones, >> excluding unnecessary false-sharing. >> >> Signed-off-by: Alexander Lobakin >> --- >> include/net/page_pool/types.h | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h >> index e1bb92c192de..989d07b831fc 100644 >> --- a/include/net/page_pool/types.h >> +++ b/include/net/page_pool/types.h >> @@ -127,7 +127,7 @@ struct page_pool { >> >> bool has_init_callback; > > It seems odd to have only a slow field between tow fast > field group, isn't it better to move it to the end of > page_pool or where is more appropriate? 1. There will be more in the subsequent patches. 2. ::has_init_callback happens each new page allocation, it's not slow. Jakub did put it here for purpose. > >> >> - long frag_users; >> + long frag_users __aligned(4 * sizeof(long)); > > If we need that, why not just use '____cacheline_aligned_in_smp'? It can be an overkill. We don't need a full cacheline, but only these fields to stay within one, no matter whether they are in the beginning of it or at the end. > >> struct page *frag_page; >> unsigned int frag_offset; >> u32 pages_state_hold_cnt; >> Thanks, Olek _______________________________________________ Intel-wired-lan mailing list Intel-wired-lan@osuosl.org https://lists.osuosl.org/mailman/listinfo/intel-wired-lan