wireguard-linux/mm/damon, branch update-toolchain

mm: provide mm_struct and address to huge_ptep_get()

2024-07-12T22:52:15Z

On powerpc 8xx huge_ptep_get() will need to know whether the given ptep is a PTE entry or a PMD entry. This cannot be known with the PMD entry itself because there is no easy way to know it from the content of the entry. So huge_ptep_get() will need to know either the size of the page or get the pmd. In order to be consistent with huge_ptep_get_and_clear(), give mm and address to huge_ptep_get(). Link: https://lkml.kernel.org/r/cc00c70dd384298796a4e1b25d6c4eb306d3af85.1719928057.git.christophe.leroy@csgroup.eu Signed-off-by: Christophe Leroy Reviewed-by: Oscar Salvador Cc: Jason Gunthorpe Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Peter Xu Signed-off-by: Andrew Morton

Merge branch 'mm-hotfixes-stable' into mm-stable to pick up "mm: fix

2024-07-06T18:44:41Z

crashes from deferred split racing folio migration", needed by "mm: migrate: split folio_migrate_mapping()".

mm/damon/paddr: initialize nr_succeeded in __damon_pa_migrate_folio_list()

2024-07-05T01:05:50Z

The variable is supposed to be set via later migrate_pages() call. However, the function does not do that when CONFIG_MIGRATION is unset. Initialize the variable to zero. Link: https://lkml.kernel.org/r/20240701165332.47495-1-sj@kernel.org Fixes: 5311c0a2eee3 ("mm/damon/paddr: introduce DAMOS_MIGRATE_COLD action for demotion") Signed-off-by: SeongJae Park Reported-by: kernel test robot Reported-by: Dan Carpenter Closes: https://lore.kernel.org/r/202406251102.GE07hqfQ-lkp@intel.com/ Cc: Honggyu Kim Cc: Hyeongtak Ji Signed-off-by: Andrew Morton

mm/damon/core: merge regions aggressively when max_nr_regions is unmet

2024-07-04T05:40:36Z

DAMON keeps the number of regions under max_nr_regions by skipping regions split operations when doing so can make the number higher than the limit. It works well for preventing violation of the limit. But, if somehow the violation happens, it cannot recovery well depending on the situation. In detail, if the real number of regions having different access pattern is higher than the limit, the mechanism cannot reduce the number below the limit. In such a case, the system could suffer from high monitoring overhead of DAMON. The violation can actually happen. For an example, the user could reduce max_nr_regions while DAMON is running, to be lower than the current number of regions. Fix the problem by repeating the merge operations with increasing aggressiveness in kdamond_merge_regions() for the case, until the limit is met. [sj@kernel.org: increase regions merge aggressiveness while respecting min_nr_regions] Link: https://lkml.kernel.org/r/20240626164753.46270-1-sj@kernel.org [sj@kernel.org: ensure max threshold attempt for max_nr_regions violation] Link: https://lkml.kernel.org/r/20240627163153.75969-1-sj@kernel.org Link: https://lkml.kernel.org/r/20240624175814.89611-1-sj@kernel.org Fixes: b9a6ac4e4ede ("mm/damon: adaptively adjust regions") Signed-off-by: SeongJae Park Cc: [5.15+] Signed-off-by: Andrew Morton

mm/damon/lru_sort: remove unnecessary online tuning handling code

2024-07-04T02:30:15Z

DAMON_LRU_SORT contains code for handling of online DAMON parameters update edge cases. It is no more necessary since damon_commit_ctx() takes care of the cases. Remove the unnecessary code. Link: https://lkml.kernel.org/r/20240618181809.82078-13-sj@kernel.org Signed-off-by: SeongJae Park Signed-off-by: Andrew Morton

mm/damon/lru_sort: use damon_commit_ctx()

2024-07-04T02:30:14Z

DAMON_LRU_SORT manually manipulates the DAMON context struct for online parameters update. Since the struct contains not only input parameters but also internal status and operation results, it is not that simple. Indeed, we found and fixed a few bugs in the code. Now DAMON core layer provides a function for the usage, namely damon_commit_ctx(). Replace the manual manipulation logic with the function. The core layer function could have its own bugs, but this change removes a source of bugs. Link: https://lkml.kernel.org/r/20240618181809.82078-12-sj@kernel.org Signed-off-by: SeongJae Park Signed-off-by: Andrew Morton

mm/damon/reclaim: remove unnecessary code for online tuning

2024-07-04T02:30:14Z

DAMON_RECLAIM contains code for handling of online DAMON parameters update edge cases. It is no more necessary since damon_commit_ctx() takes care of the cases. Remove the unnecessary code. Link: https://lkml.kernel.org/r/20240618181809.82078-11-sj@kernel.org Signed-off-by: SeongJae Park Signed-off-by: Andrew Morton

mm/damon/reclaim: use damon_commit_ctx()

2024-07-04T02:30:14Z

DAMON_RECLAIM manually manipulates the DAMON context struct for online parameters update. Since the struct contains not only input parameters but also internal status and operation results, it is not that simple. Indeed, we found and fixed a few bugs in the code. Now DAMON core layer provides a function for the usage, namely damon_commit_ctx(). Replace the manual manipulation logic with the function. The core layer function could have its own bugs, but this change removes a source of bugs. Link: https://lkml.kernel.org/r/20240618181809.82078-10-sj@kernel.org Signed-off-by: SeongJae Park Signed-off-by: Andrew Morton

mm/damon/sysfs-schemes: rename *_set_{schemes,scheme_filters,quota_score,schemes}()

2024-07-04T02:30:14Z

The functions were for updating DAMON structs that may or may not be partially populated. Hence it was not for only adding items, but also removing unnecessary items and updating items in-place. A previous commit has changed the functions to assume the structs are not partially populated, and do only adding items. Make the names better explain the behavior. Link: https://lkml.kernel.org/r/20240618181809.82078-9-sj@kernel.org Signed-off-by: SeongJae Park Signed-off-by: Andrew Morton

mm/damon/sysfs-schemes: remove unnecessary online tuning handling code

2024-07-04T02:30:14Z

damon/sysfs-schemes.c contains code for handling of online DAMON parameters update edge cases. The logics are no more necessary since damon_commit_ctx() and damon_commit_quota_goals() takes care of the cases. Remove the unnecessary code. Link: https://lkml.kernel.org/r/20240618181809.82078-8-sj@kernel.org Signed-off-by: SeongJae Park Signed-off-by: Andrew Morton