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bEqsSs802oSy0QRrdnrTxAYlJ+z7usRpuKR4KwBgC6FlIlL7VCpGV1INhWwInVMXog2EMYw2vTC req9dvXf9EJtUD+efVrHuwU1TJ4Or4tMedZFGhY3A0oACL2DMDJKNB5v4JvlySKIabqQYlYRz6t 8fEyu+SPnOOge2fQMVRqrx3w+eZJNK4fqg6w7IV7uQpkdXw5/UW8RNQAGi1QniwSMr5UnpjzezQ uJYMG+69hwZ7ODdIGULZVpDpsIXLke7cQ7+ge4TaH9noxxAYWhzPyiaI3jzUSXo6eBlsW1VsMHb yTT0K03umG3gB+6avV8k7O5sSH3yi8R4DokGYHqI7c6I4+6XSQ+wVO7dnLPb8fpVeIrrClhU X-Proofpoint-ORIG-GUID: 8WF9Xr20l4Q7vdEqPv26Xp81Cyg9d-Np X-Authority-Analysis: v=2.4 cv=X/5SKHTe c=1 sm=1 tr=0 ts=68547296 cx=c_pps a=OOZaFjgC48PWsiFpTAqLcw==:117 a=OOZaFjgC48PWsiFpTAqLcw==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=6IFa9wvqVegA:10 a=GoEa3M9JfhUA:10 a=wEWmzi6hgfC_Eq5b2vIA:9 X-Proofpoint-GUID: 8WF9Xr20l4Q7vdEqPv26Xp81Cyg9d-Np This is a series of patches that helps address a number of 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. 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 | 569 +++++++++++++++++++++------------------- 3 files changed, 309 insertions(+), 278 deletions(-) -- 2.49.0