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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Content-Type: text/plain; charset="utf-8" X-Rspamd-Server: rspam11 X-Rspam-User: X-Stat-Signature: j4bd4qmtzmeu49n5b4yud8quurts9kdw X-Rspamd-Queue-Id: 4B991C0003 X-HE-Tag: 1783081938-967275 X-HE-Meta: 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 WbmBK8ni 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Based on mm-new. This depends on moving alloc_tag to mm/: 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 v5: - Just trivial non-functional fixes. - Link to v4: https://patch.msgid.link/20260702-alloc-trylock-v4-0-0af8ff387e80@google.com Changes in v4: - Fixed some (harmless) missing applications of ac->alloc_flags (local Sashiko) - Fixed various build issues. - Note that Sashiko pointed out a KMSAN build issue [0], I have fixed it but KMSAN builds are currently broken by objtool [1]. At least mm/kmsan/init.c compiles. [2] https://lore.kernel.org/all/20260629141642.628271F00A3D@smtp.kernel.org/ [3] https://lore.kernel.org/all/20260630104434.GC751831@noisy.programming.kicks-ass.net/t/#u - Avoided setting ALLOC_NOFRAGMENT under ALLOC_NOLOCK (Sashiko, Harry) - Added patch to tweak alloc_flags_cma() interface (Vlastimil) - More commit messages fixups (various) - Added patch to create can_spin_trylock() (Harry) - Link to v3: https://patch.msgid.link/20260629-alloc-trylock-v3-0-57bef0eadbc2@google.com 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 (17): 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/page_alloc: drop alloc_flags arg from alloc_flags_cma() mm: factor out can_spin_trylock() Vlastimil Babka (SUSE) (1): 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 | 5 +- drivers/net/ethernet/fungible/funeth/funeth_rx.c | 2 +- include/linux/alloc_tag.h | 4 +- include/linux/gfp.h | 54 +--- include/linux/gfp_types.h | 7 - include/linux/skbuff.h | 2 +- include/trace/events/mmflags.h | 10 +- mm/alloc_tag.c | 23 +- mm/compaction.c | 5 +- mm/hugetlb.c | 4 +- mm/internal.h | 275 ++------------------ mm/khugepaged.c | 1 + mm/kmsan/init.c | 2 +- mm/memory-failure.c | 1 + mm/memory_hotplug.c | 1 + mm/mempolicy.c | 11 +- mm/migrate.c | 1 + mm/mm_init.c | 1 + mm/page_alloc.c | 269 ++++++++++--------- mm/page_alloc.h | 312 +++++++++++++++++++++++ mm/page_frag_cache.c | 6 +- mm/page_isolation.c | 1 + mm/page_owner.c | 2 +- mm/page_reporting.c | 1 + mm/show_mem.c | 1 + mm/shuffle.c | 1 + mm/slub.c | 17 +- mm/swap.c | 1 + mm/vmscan.c | 1 + mm/vmstat.c | 1 + tools/include/linux/gfp_types.h | 7 - 37 files changed, 536 insertions(+), 508 deletions(-) --- base-commit: 32af3ff0925368eff29b2fed62f154150eb5dc10 change-id: 20260617-alloc-trylock-14ad37dab337 Best regards, -- Brendan Jackman