Changelog: v10 - v9 - Addressed new comments from Michal Hocko. - Sent "mm: deferred_init_memmap improvements" as a separate patch as it is also fixing existing problem. - Merged "mm: stop zeroing memory during allocation in vmemmap" with "mm: zero struct pages during initialization". - Added more comments "mm: zero reserved and unavailable struct pages" v9 - v8 - Addressed comments raised by Mark Rutland and Ard Biesheuvel: changed kasan implementation. Added a new function: kasan_map_populate() that zeroes the allocated and mapped memory v8 - v7 - Added Acked-by's from Dave Miller for SPARC changes - Fixed a minor compiling issue on tile architecture reported by kbuild v7 - v6 - Addressed comments from Michal Hocko - memblock_discard() patch was removed from this series and integrated separately - Fixed bug reported by kbuild test robot new patch: mm: zero reserved and unavailable struct pages - Removed patch x86/mm: reserve only exiting low pages As, it is not needed anymore, because of the previous fix - Re-wrote deferred_init_memmap(), found and fixed an existing bug, where page variable is not reset when zone holes present. - Merged several patches together per Michal request - Added performance data including raw logs v6 - v5 - Fixed ARM64 + kasan code, as reported by Ard Biesheuvel - Tested ARM64 code in qemu and found few more issues, that I fixed in this iteration - Added page roundup/rounddown to x86 and arm zeroing routines to zero the whole allocated range, instead of only provided address range. - Addressed SPARC related comment from Sam Ravnborg - Fixed section mismatch warnings related to memblock_discard(). v5 - v4 - Fixed build issues reported by kbuild on various configurations v4 - v3 - Rewrote code to zero sturct pages in __init_single_page() as suggested by Michal Hocko - Added code to handle issues related to accessing struct page memory before they are initialized. v3 - v2 - Addressed David Miller comments about one change per patch: * Splited changes to platforms into 4 patches * Made "do not zero vmemmap_buf" as a separate patch v2 - v1 - Per request, added s390 to deferred "struct page" zeroing - Collected performance data on x86 which proofs the importance to keep memset() as prefetch (see below). SMP machines can benefit from the DEFERRED_STRUCT_PAGE_INIT config option, which defers initializing struct pages until all cpus have been started so it can be done in parallel. However, this feature is sub-optimal, because the deferred page initialization code expects that the struct pages have already been zeroed, and the zeroing is done early in boot with a single thread only. Also, we access that memory and set flags before struct pages are initialized. All of this is fixed in this patchset. In this work we do the following: - Never read access struct page until it was initialized - Never set any fields in struct pages before they are initialized - Zero struct page at the beginning of struct page initialization ========================================================================== Performance improvements on x86 machine with 8 nodes: Intel(R) Xeon(R) CPU E7-8895 v3 @ 2.60GHz and 1T of memory: TIME SPEED UP base no deferred: 95.796233s fix no deferred: 79.978956s 19.77% base deferred: 77.254713s fix deferred: 55.050509s 40.34% ========================================================================== SPARC M6 3600 MHz with 15T of memory TIME SPEED UP base no deferred: 358.335727s fix no deferred: 302.320936s 18.52% base deferred: 237.534603s fix deferred: 182.103003s 30.44% ========================================================================== Raw dmesg output with timestamps: x86 base no deferred: https://hastebin.com/ofunepurit.scala x86 base deferred: https://hastebin.com/ifazegeyas.scala x86 fix no deferred: https://hastebin.com/pegocohevo.scala x86 fix deferred: https://hastebin.com/ofupevikuk.scala sparc base no deferred: https://hastebin.com/ibobeteken.go sparc base deferred: https://hastebin.com/fariqimiyu.go sparc fix no deferred: https://hastebin.com/muhegoheyi.go sparc fix deferred: https://hastebin.com/xadinobutu.go Pavel Tatashin (10): x86/mm: setting fields in deferred pages sparc64/mm: setting fields in deferred pages sparc64: simplify vmemmap_populate mm: defining memblock_virt_alloc_try_nid_raw mm: zero reserved and unavailable struct pages mm/kasan: kasan specific map populate function x86/kasan: use kasan_map_populate() arm64/kasan: use kasan_map_populate() mm: stop zeroing memory during allocation in vmemmap sparc64: optimized struct page zeroing arch/arm64/include/asm/pgtable.h | 3 ++ arch/arm64/mm/kasan_init.c | 12 +++---- arch/sparc/include/asm/pgtable_64.h | 30 +++++++++++++++++ arch/sparc/mm/init_64.c | 32 ++++++++---------- arch/x86/mm/init_64.c | 10 ++++-- arch/x86/mm/kasan_init_64.c | 8 ++--- include/linux/bootmem.h | 27 +++++++++++++++ include/linux/kasan.h | 2 ++ include/linux/memblock.h | 16 +++++++++ include/linux/mm.h | 26 ++++++++++++++ mm/kasan/kasan_init.c | 67 +++++++++++++++++++++++++++++++++++++ mm/memblock.c | 60 +++++++++++++++++++++++++++++---- mm/page_alloc.c | 54 +++++++++++++++++++++++++----- mm/sparse-vmemmap.c | 15 ++++----- mm/sparse.c | 6 ++-- 15 files changed, 312 insertions(+), 56 deletions(-) -- 2.14.2 -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html