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AFNElJ/CifBY01FlGBLeUtxY+fy7Vpwrd5XGLpTRWghm1geXYPX2Y8js/7AkYtkZqxg+fMTqYxIs2CJAvw==@kvack.org X-Gm-Message-State: AOJu0YzUAjrIZ0lNxV8SYXLCua+1gxZWVLEjRReeRhKAJZSnv+zq1Z/p kvDSOmFCj8lEuFODyTV5zIeRfa+rrMi6Tzu0Dd0oYnfMcpzorEmYhOoSWpneMFgP/VTHBVEGM/O WPHrO1oJ+lM/e7Cus0TbS0Q== X-Received: from edev7-n1.prod.google.com ([2002:a05:6402:a2c7:10b0:676:9c94:9878]) (user=mclapinski job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6402:1f01:b0:674:37b7:227c with SMTP id 4fb4d7f45d1cf-67437b722e4mr9379117a12.2.1776947142685; Thu, 23 Apr 2026 05:25:42 -0700 (PDT) Date: Thu, 23 Apr 2026 14:25:35 +0200 Mime-Version: 1.0 X-Mailer: git-send-email 2.54.0.rc2.533.g4f5dca5207-goog Message-ID: <20260423122538.140993-1-mclapinski@google.com> Subject: [PATCH v9 0/3] kho: add support for deferred struct page init From: Michal Clapinski To: Evangelos Petrongonas , Pasha Tatashin , Mike Rapoport , Pratyush Yadav , Alexander Graf , Samiullah Khawaja , kexec@lists.infradead.org, linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Andrew Morton , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Michal Clapinski Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: A0A6A140004 X-Stat-Signature: z9p5e43ant4zoerzwx45c63r145bznja X-Rspam-User: X-HE-Tag: 1776947144-44139 X-HE-Meta: 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 xqIUo3sV 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: When CONFIG_DEFERRED_STRUCT_PAGE_INIT is enabled, struct page initialization is deferred to parallel kthreads that run later in the boot process. Currently, KHO is incompatible with DEFERRED. This series fixes that incompatibility. --- v9: - moved init_pageblock_migratetype from memmap_init_reserved_range to __init_page_from_nid - reduced number of ifdefs - new commit to test this feature v8: - moved overriding the migratetype from init_pageblock_migratetype to callsites v7: - reimplemented the initialization of kho scratch again v6: - reimplemented the initialization of kho scratch v5: - rebased v4: - added a new commit to fix deferred init of kho scratch - switched to ulong when refering to pfn v3: - changed commit msg - don't invoke early_pfn_to_nid if CONFIG_DEFERRED_STRUCT_PAGE_INIT=n v2: - updated a comment I took Evangelos's test code: https://git.infradead.org/?p=users/vpetrog/linux.git;a=shortlog;h=refs/heads/kho-deferred-struct-page-init and then modified it to this monster test that does 2 allocations: at core_initcall (early) and at module_init (late). Then kexec, then 2 more allocations at these points, then restore the original 2, then kexec, then restore the other 2. Basically I test preservation of early and late allocation both on cold and on warm boot. Tested it both with and without DEFERRED. https://github.com/mclapinski/linux/commits/deferred_test/ This patch probably doesn't apply onto anything currently. It's based on mm-new with "memblock: move reserve_bootmem_range() to memblock.c and make it static" cherrypicked from rppt/memblock. Evangelos Petrongonas (1): kho: make preserved pages compatible with deferred struct page init Michal Clapinski (2): kho: fix deferred initialization of scratch areas selftests: kho: test with deferred struct page init include/linux/memblock.h | 21 +++++++++- kernel/liveupdate/Kconfig | 2 - kernel/liveupdate/kexec_handover.c | 52 ++++++++++++------------- mm/memblock.c | 56 +++++++++++---------------- mm/mm_init.c | 30 +++++++------- tools/testing/selftests/kho/vmtest.sh | 4 ++ 6 files changed, 88 insertions(+), 77 deletions(-) -- 2.54.0.rc2.533.g4f5dca5207-goog