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 JVLen9Ny 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historic problems in the madvise() implementation: * Eliminate the visitor pattern and having the code which is implemented for both the anon_vma_name implementation and ordinary madvise() operations use the same madvise_vma_behavior() implementation. * Thread state through the madvise_behavior state object - this object, very usefully introduced by SJ, is already used to transmit state through operations. This series extends this by having all madvise() operations use this, including anon_vma_name. * Thread range, VMA state through madvise_behavior - This helps avoid a lot of the confusing code around range and VMA state and again keeps things consistent and with a single 'source of truth'. * Addressing the very strange behaviour around the passed around struct vm_area_struct **prev pointer - all read-only users do absolutely nothing with the prev pointer. The only function that uses it is madvise_update_vma(), and in all cases prev is always reset to VMA. Fix this by no longer having aything but madvise_update_vma() reference prev, and having madvise_walk_vmas() update prev in each instance. Additionally make it clear that the meaningful change in vma state is when madvise_update_vma() potentially merges a VMA, so explicitly retrieve the VMA in this case. * Update and clarify the madvise_walk_vmas() function - this is a source of a great deal of confusion, so simplify, stop using prev = NULL to signify that the mmap lock has been dropped (!) and make that explicit, and add some comments to explain what's going on. v2: * Propagated tags (thanks everyone!) * Don't separate out __MADV_SET_ANON_VMA_NAME and __MADV_SET_CLEAR_VMA_NAME, just use __MADV_SET_ANON_VMA_NAME as per Zi. * Eliminate is_anon_vma_name() as no longer necessary, addressing Zi's concern around naming another way :) * Put mm_struct abstraction of try_vma_read_lock() into 2/5 from 3/5 as per Zi. * Added comment about get/put anon_vma_name in madvise_vma_behavior() as per Vlastimil. * Renamed have_anon_name to set_new_anon_name to make it clear why we make an exception to this get/put behaviour in madvise_vma_behavior(). * Reworded 1/4 commit message to make it clearer what's being done as per Vlastimil. * Avoid comma-separated decls in struct madvise_behavior_range as per Zi and Vlastimil. * Put fix for silly development bug (range->start comparison to end not range->end) in 3/5 rather than 4/5 so as to eliminate it altogether, having fixed it during development but having not put the fix in the correct place :) as per Vlastimil. * Rename end to last_end in madvise_walk_vmas() and added a comment for clarity as per Vlastimil. * Update madvise_walk_vmas() comment to no longer refer to a visitor function. * Separated out prev, vma fields in struct madvise_behavior as per Vlastimil. * Added assert on not holding VMA lock whenever mmap lock is dropped and abstracted to mark_mmap_lock_dropped() so we always assert when we do this, based on discussion with Vlastimil. * Removed duplicate comment about weird -ENOMEM unmapped error behaviour. v1: https://lore.kernel.org/all/cover.1750363557.git.lorenzo.stoakes@oracle.com/ Lorenzo Stoakes (5): mm/madvise: remove the visitor pattern and thread anon_vma state mm/madvise: thread mm_struct through madvise_behavior mm/madvise: thread VMA range state through madvise_behavior mm/madvise: thread all madvise state through madv_behavior mm/madvise: eliminate very confusing manipulation of prev VMA include/linux/huge_mm.h | 9 +- mm/khugepaged.c | 9 +- mm/madvise.c | 585 +++++++++++++++++++++------------------- 3 files changed, 313 insertions(+), 290 deletions(-) -- 2.49.0