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Message-ID: <CAC_iWjKr-Jd7DsAameimUYPUPgu8vBrsFb0cDJiNSBLEwqKF1A@mail.gmail.com> Date: Sat, 10 May 2025 10:02:59 +0300 From: Ilias Apalodimas <ilias.apalodimas@...aro.org> To: Jakub Kicinski <kuba@...nel.org> Cc: Byungchul Park <byungchul@...com>, willy@...radead.org, almasrymina@...gle.com, kernel_team@...ynix.com, 42.hyeyoo@...il.com, linux-mm@...ck.org, hawk@...nel.org, netdev@...r.kernel.org Subject: Re: [RFC] shrinking struct page (part of page pool) Hi Jakub [...] > > > > > > struct bump { > > > unsigned long _page_flags; > > > unsigned long bump_magic; > > > struct page_pool *bump_pp; > > > unsigned long _pp_mapping_pad; > > > unsigned long dma_addr; > > > atomic_long_t bump_ref_count; > > > unsigned int _page_type; > > > atomic_t _refcount; > > > }; > > > > > > To netwrok guys, any thoughts on it? > > > To Willy, do I understand correctly your direction? > > > > > > Plus, it's a quite another issue but I'm curious, that is, what do you > > > guys think about moving the bump allocator(= page pool) code from > > > network to mm? I'd like to start on the work once gathering opinion > > > from both Willy and network guys. > > I don't see any benefit from moving page pool to MM. It is quite > networking specific. But we can discuss this later. Moving code > is trivial, it should not be the initial focus. Random thoughts here until I look at the patches. The concept of devices doing DMA + recycling the used buffer transcends networking. But I agree with you, that's something we can discuss on the reviews. Thanks /Ilias
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