MADV_FREE is on linux-next so long time. The reason was two, I think. 1. MADV_FREE code on reclaim path was really mess. 2. Andrew really want to see voice of userland people who want to use the syscall. A few month ago, Daniel Micay(jemalloc active contributor) requested me to make progress upstreaming but I was busy at that time so it took so long time for me to revist the code and finally, I clean it up the mess recently so it solves the #2 issue. As well, Daniel and Jason(jemalloc maintainer) requested it to Andrew again recently and they said it would be great to have even though it has swap dependency now so Andrew decided he will do that for v4.4. When I test MADV_FREE patches on recent mmotm, there is some problem with THP-refcount redesign so it's hard for long running test. Even, there is some dependency with it because patch ordering of MADV_FREE in mmotm is after THP refcount redesign so I discussed it with Andrew in hallway this kernel summit and decided to send patchset based on v4.3-rc7. I have been tested it on v4.3-rc7 and couldn't find any problem so far. In the meanwhile, Hugh reviewed all of code and asked me to tidy up a lot patches related MADV_FREE on mmotm so this is the result of the request. A final modification since I sent clean up patchset(ie, MADV_FREE refactoring and fix KSM page), there are four. 1. Replace description and comment of KSM fix patch with Hugh's suggestion 2. Avoid forcing SetPageDirty in try_to_unmap_one to avoid clean page swapout from Yalin 3. Adding uapi patch to make value of MADV_FREE for all arches same from Chen 4. Does lazy split of THP when MADV_FREE is called About 3, I include it because I thought it was good but Andrew just missed the patch at that time. But when I read quilt series file now, it seems Shaohua had some problem with it but I couldn't find any mail in my mailbox. If it has something wrong, please tell us. About 4(ie, mm: don't split THP page when syscall is called), it is new implementation so need to review. I don't understand why it added both SetPageDirty and pte_mkdirty to subpages unconditionally in split code of THP from the beginning. I guess at that time, there was no MADV_FREE so it was no problem and would be more safe to mark both. #mm-support-madvisemadv_free.patch: other-arch syscall numbering mess ("arch: uapi: asm: mman.h: Let MADV_FREE have same value for all architectures"). Shaohua Li <shli@xxxxxxxxxx> testing disasters. TODO: I will send man page patch if it would land for v4.4. Andrew, you could replace all of MADV_FREE related patches with this. IOW, these are # MADV_FREE stuff: x86-add-pmd_-for-thp.patch x86-add-pmd_-for-thp-fix.patch sparc-add-pmd_-for-thp.patch sparc-add-pmd_-for-thp-fix.patch powerpc-add-pmd_-for-thp.patch arm-add-pmd_mkclean-for-thp.patch arm64-add-pmd_-for-thp.patch mm-support-madvisemadv_free.patch mm-support-madvisemadv_free-fix.patch mm-support-madvisemadv_free-fix-2.patch mm-support-madvisemadv_free-fix-3.patch mm-support-madvisemadv_free-vs-thp-rename-split_huge_page_pmd-to-split_huge_pmd.patch mm-support-madvisemadv_free-fix-5.patch mm-support-madvisemadv_free-fix-6.patch mm-mark-stable-page-dirty-in-ksm.patch mm-dont-split-thp-page-when-syscall-is-called.patch mm-dont-split-thp-page-when-syscall-is-called-fix.patch mm-dont-split-thp-page-when-syscall-is-called-fix-2.patch mm-dont-split-thp-page-when-syscall-is-called-fix-3.patch mm-dont-split-thp-page-when-syscall-is-called-fix-4.patch mm-dont-split-thp-page-when-syscall-is-called-fix-5.patch mm-dont-split-thp-page-when-syscall-is-called-fix-6.patch mm-dont-split-thp-page-when-syscall-is-called-fix-6-fix.patch mm-free-swp_entry-in-madvise_free.patch mm-move-lazy-free-pages-to-inactive-list.patch mm-move-lazy-free-pages-to-inactive-list-fix.patch mm-move-lazy-free-pages-to-inactive-list-fix-fix.patch mm-move-lazy-free-pages-to-inactive-list-fix-fix-fix.patch * Change from v1 * Don't do unnecessary TLB flush - Shaohua * Added Acked-by - Hugh, Michal * Merge deactivate_page and deactivate_file_page * Add pmd_dirty/pmd_mkclean patches for several arches * Add lazy THP split patch * Drop zhangyanfei@xxxxxxxxxxxxxx - Delivery Failure Chen Gang (1): arch: uapi: asm: mman.h: Let MADV_FREE have same value for all architectures Minchan Kim (12): mm: support madvise(MADV_FREE) mm: define MADV_FREE for some arches mm: free swp_entry in madvise_free mm: move lazily freed pages to inactive list mm: clear PG_dirty to mark page freeable mm: mark stable page dirty in KSM x86: add pmd_[dirty|mkclean] for THP sparc: add pmd_[dirty|mkclean] for THP powerpc: add pmd_[dirty|mkclean] for THP arm: add pmd_mkclean for THP arm64: add pmd_mkclean for THP mm: don't split THP page when syscall is called arch/alpha/include/uapi/asm/mman.h | 1 + arch/arm/include/asm/pgtable-3level.h | 1 + arch/arm64/include/asm/pgtable.h | 1 + arch/mips/include/uapi/asm/mman.h | 1 + arch/parisc/include/uapi/asm/mman.h | 1 + arch/powerpc/include/asm/pgtable-ppc64.h | 2 + arch/sparc/include/asm/pgtable_64.h | 9 ++ arch/x86/include/asm/pgtable.h | 5 + arch/xtensa/include/uapi/asm/mman.h | 1 + include/linux/huge_mm.h | 3 + include/linux/rmap.h | 1 + include/linux/swap.h | 2 +- include/linux/vm_event_item.h | 1 + include/uapi/asm-generic/mman-common.h | 1 + mm/huge_memory.c | 46 +++++++- mm/ksm.c | 6 ++ mm/madvise.c | 177 +++++++++++++++++++++++++++++++ mm/rmap.c | 7 ++ mm/swap.c | 62 ++++++----- mm/swap_state.c | 5 +- mm/truncate.c | 2 +- mm/vmscan.c | 10 +- mm/vmstat.c | 1 + 23 files changed, 308 insertions(+), 38 deletions(-) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html