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But now, apart from global dentry recycling, it is not supported to do dentry recycling on a single file system separately. This feature has usage scenarios in problem localization scenarios.At the same time, it also provides users with a slightly fine-grained pagecache/entry recycling mechanism. This patchset supports the recycling of pagecache/entry for individual file systems. Diff v3 vs v2 1. Introduce introduce drop_sb_dentry_inode() helper instead of reclaim_dcache_sb()/reclaim_icache_sb() helper for reclaim dentry/inode. 2. Fixing compilation issues in specific architectures and configurations. Diff v2 vs v1: 1. Fix possible live lock for shrink_icache_sb(). 2. Introduce reclaim_dcache_sb() for reclaim dentry. 3. Fix potential deadlocks as follows: https://lore.kernel.org/linux-fsdevel/00000000000098f75506153551a1@google.com/ After some consideration, it was decided that this feature would primarily be used for debugging purposes. Instead of adding a new IOCTL command, the task_work mechanism was employed to address potential deadlock issues. Ye Bin (3): mm/vmscan: introduce drop_sb_dentry_inode() helper sysctl: add support for drop_caches for individual filesystem Documentation: add instructions for using 'drop_fs_caches sysctl' sysctl Documentation/admin-guide/sysctl/vm.rst | 44 +++++++++ fs/drop_caches.c | 125 ++++++++++++++++++++++++ include/linux/mm.h | 1 + mm/internal.h | 3 + mm/shrinker.c | 4 +- mm/vmscan.c | 50 ++++++++++ 6 files changed, 225 insertions(+), 2 deletions(-) -- 2.34.1