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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Content-Type: text/plain; charset="utf-8" X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: D3DA820011 X-Stat-Signature: ens4w6jgzaxmxaeih475jx1k5oeebayb X-HE-Tag: 1782738734-536093 X-HE-Meta: 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 5w8bpqlQ nwU5pACRGwzz5lrVrfBkoTlgJwvuEU4bPyPv1MeKufnDjHJFJzmqvOktdtojSWcxz72DJ6j9MnBN+t++5cUZaT+dOibzwc0Vf+LxP6apOuI0ECx6b06NsLkhdCA0QYAtsk/VcfntphqV6bt1JQBwCemd2GHL+dUrFjMF2mrKmD6VaiBFc8PdMc9gdbbPpDi5ojNEyhvdv1mXl3E5qWnsvPT/NCTz7vLNbvORs8hrvU/M0CPKecAawnasbqLwYio1dH/uJofuCNfhI5LntXbY82ZVASlpswED/ziDYJYPFc2wWPpvJP7gC7fEl9JvmMfMAS7de0JEN5TcqQ7COIBBikWtYWPqyVDWpsCNdMKRD1QekAuGJKawVmWXSv473a+/Y8huHNKhp/2pR4Cul/qtN6+y9KfRZaVElFI4LQXQgpbA/jtTCLuY0VsX3voMtpWhG/Gddio5ajRUtxUD+VPKFLZL2KDMMrkfbnD96yGuv6gFBotX7FEtF6Cz0dQ1Rhpi22h8QQweUGjfNveTOAtQbtjOvZX5EOdDpabClknLI8EgnPV40xQQGYzAGsmQ1vLFaoAQaEKF0vriyj2QtnKhVPNVJtzhQkV2+8DMxcgH8BHAP2aigLY1lNvMbFTj/C30I+kXlY9qSyv7nmNOwZ8EXbZPuNJqAktTIFG5QlOW0EfuYVb3Nor6BnsiOAM6GxBhkm96JPI2yqyr55Ut9frLygnfK6jH+uVNsW9PBW3DLa8opqwll1R+ETn9hh4v1kRKvy11t6444qAcfiIL2kXbWUQFMQw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This is based on mm-new, it depends on moving alloc_tag to mm/ [0]. [0] https://lore.kernel.org/all/aj5QBtJcphPElczI@lucifer/ Some tweaks and cleanups for page allocator entrypoint and flags. This is motivated by preparation for __GFP_UNMAPPED [1] (which will probably become ALLOC_UNMAPPED in its next iteration), but all this is supposed to be an improvement to the codebase in its own right: unifying code paths, reducing API surface, and removing GFP flags. [1] https://lore.kernel.org/all/20260320-page_alloc-unmapped-v2-0-28bf1bd54f41@google.com/ This started with unifying __alloc_frozen_pages[_nolock]_noprof() and expanded from there. Unifying the nolock allocator entrypoint with the normal allocator entrypoint means adding an alloc_flags argument to the later (only exposed within mm/). This presents an opportunity to take advantage of that arg to remove some GFP flags, if we add that alloc_flags arg a bit more broadly to allocator entrypoints. To distinguish between mm-internal and "public" allocator entrypoints, it makes sense to use the __ prefix. There are already some public APIs with that prefix. For *alloc_pages*, just removing those variants seems like a nice cleanup anyway, so do that. For get_free_pages, the "__" variant is the _only_ variant and it's very widely used, so it doesn't seem worthwhile to modify that. Therefore, scope this "__" change specifically to the *alloc_pages* API, which means we leave the *folio_alloc* API untouched too, even though that could probably be cleaned up if so desired. Tested: - KVM, mm, and BPF selftests in a QEMU VM - kunit.py on x86_64 - For the ALLOC_NO_CODETAG bits I just booted a VM and read /proc/allocinfo. I confirmed that if I remove ALLOC_NO_CODETAG, the kernel crashes in early boot, so I was at least booting code that depends on this logic. I used Google's internal version of Antigravity (AI coding harness) to do the repetitive bits, those commits are marked with Assisted-by, the rest is manual. Signed-off-by: Brendan Jackman --- Changes in v3: - Created mm/page_alloc.h - Fixed EXPORT_SYMBOL() issues - Reworded commit messages per Sashiko's pointers - Dropped rename of alloc_flags arg in prepare_alloc_pages() (Suren) - Renamed gfp_to_alloc_flags_nonblocking() too after rebasing onto: https://lore.kernel.org/all/20260623004600.113347-1-jp.kobryn@linux.dev/ - Link to v2: https://patch.msgid.link/20260622-alloc-trylock-v2-0-31f31367d420@google.com Changes in v2: - Fixed up whitespace in nolock unification patch - Introduced ALLOC_DEFAULT to replace literal 0 for alloc_flags - All other patches are new - Link to v1: https://patch.msgid.link/20260617-alloc-trylock-v1-1-83fd7858832e@google.com --- Brendan Jackman (16): mm/page_alloc: rename ALLOC_TRYLOCK -> ALLOC_NOLOCK mm/page_alloc: some renames to clarify alloc_flags scopes mm: name some args in a function declaration mm: Split out internal page_alloc.h mm/page_alloc: unify __alloc_frozen_pages[_nolock]_noprof() mm/page_alloc: relax GFP WARN in nolock allocs mm: move some stuff to mm/page_alloc.h perf/x86/intel: Use higher-level allocator API KVM: VMX: Use higher-level allocator API x86/virt: Use higher-level allocator API sgi-xp: Use higher-level allocator API net/funeth: Switch to higher-level allocator API mm: Remove __alloc_pages_node() mm: Move __alloc_pages() to mm/page_alloc.h mm: replace __GFP_NO_CODETAG with ALLOC_NO_CODETAG mm: remove the __GFP_NO_OBJ_EXT flag Documentation/admin-guide/cgroup-v1/cpusets.rst | 2 +- Documentation/admin-guide/mm/transhuge.rst | 2 +- MAINTAINERS | 1 + arch/x86/events/intel/ds.c | 6 +- arch/x86/kvm/vmx/vmx.c | 2 +- arch/x86/virt/hw.c | 2 +- drivers/misc/sgi-xp/xpc_uv.c | 2 +- drivers/net/ethernet/fungible/funeth/funeth_rx.c | 2 +- include/linux/gfp.h | 54 +--- mm/alloc_tag.c | 22 +- mm/compaction.c | 5 +- mm/hugetlb.c | 4 +- mm/internal.h | 253 ------------------ mm/khugepaged.c | 1 + mm/memory-failure.c | 1 + mm/memory_hotplug.c | 1 + mm/mempolicy.c | 11 +- mm/mm_init.c | 1 + mm/page_alloc.c | 259 ++++++++++--------- mm/page_alloc.h | 316 +++++++++++++++++++++++ mm/page_frag_cache.c | 6 +- mm/page_isolation.c | 1 + mm/page_owner.c | 2 +- mm/show_mem.c | 1 + mm/slub.c | 7 +- mm/swap.c | 1 + mm/vmscan.c | 1 + mm/vmstat.c | 1 + tools/include/linux/gfp_types.h | 7 - 29 files changed, 506 insertions(+), 468 deletions(-) --- base-commit: ec005628e9dbcef26b761fa860f264fe6e5fd690 change-id: 20260617-alloc-trylock-14ad37dab337 Best regards, -- Brendan Jackman